16 MANAGEMENT OF NATURAL RESOURCES
CONCEPTS
1. We can manage and conserve our natural resources as well
as the environment through
sustainable development.
2. Sustainable development means development which meets the
needs of the present generation as
well as of the future generation.
3. The objective of sustainable development is to maintain a
healthy environment which is
pollution free, so that human beings can live in harmony
with nature.
4. To achieve sustainable development, the goal should be to
minimise resource use.
5. Preservation refers to non-use, conservation attempts to
minimise the use of a natural resource
and restoration seeks to return a degraded resource to its
original state.
6. The 3R’s in sustainable development are reduce, recycle
and reuse.
7. ‘‘Reuse’’ is in a way better than recycling because the
energy used for recycling the resources is
not used in case of reuse.
8. Forests are “biodiversity hotspots”.
9. Stakeholders are the people living in or around the
forests.
10. The “Chipko movement” (“Hug the tree movement”) was a
movement of the local people to
resist the deforestation attempt on the hill slopes.
11. A major law protecting endangered species globally is
CITES (Convention on International
Trade in Endangered species).
12. India has 581 protected areas, among them 89 are
National Parks and 492 wildlife sanctuaries.
13. “Project Tiger” was initiated in 1973 and it was founded
by the World Wide Fund for Nature.
14. The Narmada Bachao Andolan has been very active in its
movement against the Sardar Sarovar
Project in Gujarat.
15. Coliform bacteria act as water pollution indicator.
16. Fossil fuels such as coal and petroleum are termed as
non-renewable sources of energy.
17. Acid rain as well as global warming are the result of
exploitation and misuse of natural resources.
18. Some important NGOs working in the field of environment
are Kalpavriksh (New Delhi), World
Wide Fund for Nature-India, Bombay Natural History Society
(BNHS) Mumbai, etc.
I. SUMMATIVE ASSESSMENT
NCERT QUESTIONS WITH THEIR ANSWERS
SECTION A : IN-TEXT QUESTIONS
Page 269
1. What changes can you make in your habits to become more
environment-friendly?
QUESTION BANK IN SCIENCE CLASS-X (TERM-II)
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R S P R A K A S H A N
OR
Suggest two measures which could be incorporated in daily
life to become more environment
friendly. [2011 (T-II)]
Ans. We can become more environment-friendly by following
the given changes in our daily life :
(i) Reusing articles : Some non-biodegradable wastes like
carry bags, packing paper, plastic
containers, metallic cans, glass bottles, etc. can be
reused.
(ii) Recycling : We can separate the recyclable items from our
daily wastes to which we can
give to the rag pickers to recycle. Paper, plastic, glass,
cotton cloth, metal, etc. are
recyclable things.
(iii) Reducing the consumption : We can reduce the
consumption of :
petroleum fuels by walking down to
nearby places.
electricity by switch off the
unnecessary lights, fans and electrical appliances.
water by repair of leaky taps and
reducing wastage.
2. What would be the advantages of exploiting resources with
short-term aims?
Ans. It will provide short term advantages and the comforts
available in plenty. There will be rapid
industrialisation and development.
3. How would these advantages differ from the advantages of
using a long term perspective in
managing our resources?
Ans. Short Term Advantages Long Term Advantages
1. The resources are available in plenty. 1. Use of various
resources is restricted.
2. People often use the things and 2. The people reuse,
replace and recycle the
throw them. used articles.
3. The resources are likely to get 3. The resources are
likely to remain available
exhausted soon. for a long time.
4. The whole ecology is harmed and 4. It is eco-friendly.
disturbed.
4. Why do you think there should be equitable distribution
of resources? What forces would be
working against an equitable distribution of our resources?
(Imp.)
Ans. The natural resources are living as well as non-living
components which provide food, fodder,
shelter, water, energy, articles of daily use and comforts.
All human beings have the
fundamental right to use these resources. Equitable
distribution of resources make this
possible.
Forces against equitable distribution :
(i) Excessive consumption by rich people.
(ii) Restricted availability of resources.
(iii) Profit-making by exploiting resources.
Page 273
1. Why should we conserve forests and wildlife?
Ans. We should conserve forests and wildlife because :-
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(i) They maintain biodiversity.
(ii) They are essential for ecological balance.
(iii) Forests prevent flood and also influence rainfall.
(iv) They provide us many life-saving drugs, silk, lac,
honey, timber, etc.
2. Suggest some approaches towards the conservation of
forests. (Imp.)
Ans. Conservation of Forests : Some approaches are –
(i) Afforestation and reforestation.
(ii) Commercial forestry should be separated.
(iii) Laws can be made for conservation of forests.
(iv) Controlled grazing.
(v) Checking on fire and cutting of trees.
(vi) Building of national parks, sanctuaries and biosphere
reserves.
Page 276
1. Find out about the traditional systems of water
harvesting/management in your region.
Ans. The traditional system of water harvesting differ from
place to place in India. Some of these
are as follows :
(i) Khadins and nadis in Rajasthan.
(ii) Bandharas and tals in Maharashtra.
(iii) Bundhis in M.P. and U.P.
(iv) Ahars and pynes in Bihar.
(v) Kulhs in Himachal Pradesh.
(vi) Ponds in the Kandi belt of J.K.
(vii) Eris (tanks) in Tamil Nadu.
(viii) Surangams in Kerala.
(ix) Kattas in Karnataka.
2. Compare the above system with the probable systems in
hilly/mountainous areas or plains or
plateau regions.
Ans. Water Harvesting in :
Hilly Mountainous areas :
(i) Kulhs, khatris, kuls in Himachal Pradesh.
(ii) Zabo in Nagaland.
(iii) Zings in Ladakh.
Plains :
(i) Tanks, kuis, jhaslars, booris or bers, vivdas, khadins
and nadis in Rajasthan.
(ii) Ponds in Jammu.
(iii) Bandharas and tals in Maharashtra.
(iv) Bundhis in MP and UP.
(v) Ahars and pynes in Bihar.
Plateau :
(i) Eris in Tamil Nadu.
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(ii) Surangams in Kerala.
(iii) Kattas in Karnataka.
3. Find out the source of water in your region/ locality. Is
water from this source available to all
the people living in that area?
Ans. The water is supplied by municipal corporation through
pipes. It is obtained either from rivers
or from canals. In some residential colonies piped water is
pumped out from ground by tube
wells and stored in tanks.
The water from municipal corporation is not available to all
the residential colonies. Many
newly built colonies and unauthorised colonies are often
without the piped water.
SECTION B : QUESTIONS AT THE END OF THE CHAPTER
1. What changes would you suggest in your home in order to
be environment-friendly? (Imp.)
Ans. (i) Judicious use of electricity by switching off
lights and electrical appliances not required.
(ii) Replacement of electricity or gas operated geysers with
solar water heaters.
(iii) Replacement of incandescent bulbs with fluorescent and
compact fluorescent ones.
(iv) Replacement of electricity generating sets with solar
light.
(v) Reducing wastage of water, food and other articles.
(vi) Having more natural light and ventilation with design
supporting warming during winters
and cooling during summer.
(vii) Increasing reuse of containers.
(viii) Separation of recyclable waste from non-recyclable
waste prior to disposal.
(ix) Using cloth bags instead of polythene, plastic or paper
bags.
2. Can you suggest some changes in your school which would
make it environment-friendly?
Ans. (i) Enough trees and plants can be planted in the
school garden.
(ii) Student should be educated not to pluck leaves and
flowers unnecessarily.
(iii) Students and teachers can be educated about the tricks
of environment conservation.
(iv) Water and electricity should not be wasted.
(v) Paper can be reused by using it in various crafts.
(vi) There can be more windows in school for natural light.
(vii) Seminars can be organised for spreading environment
awareness; etc.
(viii) Compost pits can be made in corners of school area in
which biodegradable wastes can be
dumped to prepare useful compost.
3. We saw in this chapter that there are four main
stakeholders when it comes to forests and
wildlife. Which among these should have the authority to
decide the management of forest
produce? Why do you think so? (Imp.)
OR
List any four stakeholders which may help in the
conservation of forests. [2011 (T-II)]
Ans. The four main stakeholders are –
(i) People : They live in and around forests and depend on
forest produce for various aspects of
their lives.
(ii) The government : It owns and controls the resources of
forests and wildlife.
(iii) The industrialists : They use forest produce but are
not dependent on a forest in any one
area.
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(iv) Wildlife and nature enthusiasts : They want to conserve
nature in its natural form. The
management of forest produce should be in the hands of the
local people who depend upon
the forest and wildlife for their lives for centuries. But
there should also be some framework
(by the Government) in place which monitors their use of
resources so that the exploitation
of the forest produce by the local people can be restricted.
Also there should be some limited
access to the wildlife enthusiasts and scientists who may
study the various aspects of forests
and wildlife.
4. How can you as an individual contribute or make a
difference to the management of (a) forests
and wildlife, (b) water resources and (c) coal and
petroleum? (V.Imp.)
Ans. I can make a difference by the following ways :-
(a) Forests and Wildlife :
(i) Sustainable use of product from forests and wildlife.
(ii) More and more plantation should be encouraged.
(iii) Joint forest management committees should be formed.
(iv) Financial aid should be given to the organisations
helping in forest and wildlife
conservation.
(b) Water Resources :
(i) Recharge the ground water by rain water harvesting.
(ii) Suggest and train the farmers to apply the modern
techniques of irrigation so that
wastage of water can be controlled.
(iii) Judicious use of water and forests.
(c) Coal and Petroleum :
(i) These should be highly purified to reduce air pollution.
(ii) Maximum use of solar energy.
(iii) Other optional source of fuel should be discovered for
transport system.
5. What can you as an individual do to reduce your
consumption of the various natural resources?
Ans. One should follow the practice :-
(i) Such as save electricity by switching off the electrical
equipements not required.
(ii) Follow the principles of three R's (Reduce, Recycle and
Reuse).
(iii) Do not waste food.
(iv) Save water.
(v) Use cooking gas instead of wood for cooking.
6. List five things you have done over the last one week to
–
(a) conserve our natural resources.
(b) increase the pressure on our natural resources.
Ans. (a) To conserve our natural resources, I –
(i) used public transport for going to the market and
school.
(ii) saved water from our daily works and used it for
gardening.
(iii) installed CFL in place of tube-lights.
(iv) saved paper by using each page on both the sides.
(b) I increased the pressure on our natural resources by –
(i) While brushing my teeth, I did not close the tap so
wasted the water.
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(ii) I brought more food in my tiffin than I required, so I
wasted the food.
(iii) I left the switch on the fan when I went to school.
7. On the basis of the issues raised in this chapter, what
changes would you incorporate in your life-
style in a move towards a sustainable use of our resources?
(Imp.)
OR
List four changes you would like to incorporate in your life
style which would facilitate the more
towards a sustainable use of available resources in our
country. [2011 (T-II)]
Ans. We can make the following changes for sustainable use
of natural resources :-
(1) Follow the principle of three R’s – recycle, reduce and
reuse.
(2) Undertake tree plantation every year during the days of
Van Mahotsava.
(3) Use the public transport, school bus and car pools
wherever possible.
(4) Use solar energy.
ADDITIONAL QUESTIONS
(As Per CCE Pattern)
A. Very Short Answer Questions [1 Mark]
Previous Years' Questions
1. India has more than 50,000 strains of rice. Mention the
level of biodiversity it represents.
[2010]
Ans. It is a genetic variation within the species.
2. Mention the information that the health workers derive by
measuring BOD of a water body.
[2009]
Ans. BOD (Biological Oxygen Demand) is the amount of oxygen
required for biological
oxidation of microbes in any unit volume of water.
3. State an instance where human intervention saved the
forest from destruction. [2009]
Ans. Chipko movement.
4. Name any two forest products, each of which is the basis
for some industry. [2009]
Ans. 1. Wood : Sports, furniture and paper manufacturing.
2. Resin : Turpentine industry.
5. Why are coal and petroleum considered to be non-renewable
sources of energy? [2009]
Ans. Coal and petroleum are considered non-renewable sources
of energy because they are not
being formed continuously in nature and are, therefore, not
replenished. Continuous use will
result in their depletion.
6. What is meant by renewable natural resources? [2009]
Ans. Renewable natural resources are replenished regularly
and are therefore, likely to remain
available indefinitely if they are used judiciously. Example
: forests.
7. What are the two kinds of natural resources? [2009]
Ans. (i) Inexhaustible resources that occur in abundance and
does not diminish with time.
(ii) Exhaustible resources are likely to reduce with
continued exploitation.
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8. Which one of the following is a renewable resource?
Natural gas, Petroleum, Ground water, Coal. [2008]
Ans. Ground water.
9. Fire wood is our conventional fuel. List any four reasons
for replacing it by alternate sources
of energy. ]2008]
Ans. (i) It results in deforestation.
(ii) Small energy value.
(iii) It is bulky.
(iv) More pollution is produced.
10. Which one of the following gases is the major
constituent of biogas: CO2, H2, CH4, CO2?
[2008]
Ans. CH4 (methane)
11. How is the increase in demand for energy affecting air
environment already? [2008]
Ans. The increased consumption of fossil fuels like coal,
petroleum and natural gas is releasing
a lot of polluting gases such as CO2, CO, SO2 and NO2 some
of which are causing green
house effect and acid rain.
12. List any two traditional systems of water harvesting.
[2008]
Ans. Ponds and streams.
Other Important Questions
1. Define biodiversity.
Ans. The existence of a wide variety of species of plants,
animals and micro-organisms in a natural
community is called biodiversity.
2. Give the main aim of conservation. (Imp.)
Ans. The aim of conservation is to preserve the biodiversity
we have inherited, for the future
generations.
3. What are the two main sources of energy today?
Ans. Coal and petroleum.
4. Define water harvesting.
Ans. Water harvesting is the activity of collection of rain
water directly by various means.
5. Give two causes of overexploitation of natural resources.
(V.Imp.)
Ans. (i) Industrial growth
(ii) Population growth
6. Name the products formed on burning of coal and
petroleum.
Ans. CO2, water, oxides of nitrogen and oxides of sulphur.
7. Name the most common practice of recharging the ground
water.
Ans. Rain water harvesting.
8. Name the major programme started to replenish forests.
Ans. Silviculture
9. What is Khadin? (Imp.)
Ans. Khadin is a traditional water harvesting system in
Rajasthan.
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10. Which of the project was launched to clean Ganga?
Ans. Ganga Action Plan (GAP).
11. Write the expanded form of MPN.
Ans. MPN – Most Probable Number.
12. What are the 3R’s to save the environment? (V.Imp.)
Ans. The 3R’s are — (i) Reuse (ii) Recycle (iii) Reduce
13. Name the award that Government of India instituted in
the memory of a social worker who
protected khejri trees.
Ans. Amrita Devi Bishnoi National Award for Wildlife
Conservation.
14. What are the water harvesting methods used in
Maharashtra ?
Ans. Bandharas and tals.
15. When was Ganga Action Plan launched? (Imp.)
Ans. In 1985.
B. Short Answer Questions - I [2 Marks]
Previous Years' Questions
1. Mention any two reasons for which environmentalist
protested against raising height of the
‘Sardar Sarovar Dam’ on river Narmada. [2011 (T-II)]
Ans. (i) Social problems : Due to construction of high rise
dams, a vast area of land gets
submerged under water resulting in displacement of large
number of people. These
displaced people do not get adequate compensation or
rehabitation.
(ii) Economic problems : The construction of high-rise dams
involves spending of huge
amount of public money and the benefits generated by these
projects are not proportional
to the expenditure.
2. What is watershed management? How is it helpful to
ecosystem? [2011 (T-II)]
Ans. Watershed is a raised area which acts as a source of
run-off water to low-lying areas and
watershed management emphasises scientific method soil and
water conservation in order to
increase the biomass production.
It is helpful to ecosystem because
(i) Growing more trees in watershed areas increasing the
retention of more rain water and
protection of soil from erosion.
(ii) It enhances the productivity that increases the income
of watershed community.
(iii) It reduces droughts and flood downstream.
(iv) It increases the life of the downstream dam and
reservations because of less silting.
3. What harm has been caused to alpine meadows since nomadic
shepherds have stopped from
grazing their cattle in such meadows? [2011 (T-II)]
Ans. Nomadic Shepherds used to take their flocks to alpine
meadows for grazing during summer
but they were prevented from doing so, due to establishment
of Great Himalayan National
Park. The grass of alpine meadows now grows very tall and
falls over resulting in stoppage
of fresh growth. This example shows that management of
protected areas cannot be
successful in the long run without the involvement of the
local people. They cannot be
blamed for all the damage done to the forests.
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4. Burning of coal and petroleum pollute the environment.
Justify this statement. [2011 (T-II)]
Ans. On combustion, coal and petroleum produce carbon dioxide,
water, oxides of nitrogen and
oxides of sulphur and carbon monoxide. The oxides of sulphur
and nitrogen and carbon
monoxide are poisonous at high concentrations are considered
as major air pollutant.
5. (a) Why are coal and petroleum called fossil fuels?
(b) Name any two elements present in fossil fuels in
addition to carbon. [2011 (T-II)]
Ans. Coal and petroleum are formed millions of years ago
from degeneration of biomass inside the
earth under high pressure, heat and anaerobic conditions.
Hence, coal and petroleum are
called fossil fuels.
6. Explain with the help of two examples how the
participation of local people has led to
conservation of forest in the past.
OR
With the help of an example explain how involvement of local
people can lead to efficient
management of forests. [2011 (T-II)]
Ans. Examples of people's participation in the management of
forests.
(i) In 1972, the West Bengal Forest Department realised its
failure in revising the degraded
sal forests in the south western district of the state.
After realising their failure, the forest
department revised strategy and allowed forest officer A.K.
Banerjee of Arbarsi forest
range of Midnapore to involve villagers in the regeneration
of 1272 hectares of badly
degraded sal forest. He provided employment to villagers in
silviculture (cultivation of
trees) and foresting, 25% of final harvest and allowed
collection of fuel wood and fodder
at a nominal fee. With the active participation of the local
community, the sal forests of
Arbari had been revived and in 1983 it was valued at Rs 12.5
crores.
(ii) The role of the local people in forest management can
be discussed here – Locals are
traditionally conservationist e.g. Bishnois of Rajasthan and
nearby areas consider
conservation of forest and wildlife as religious tenet. The
Government of India has
recently instituted an award called Amrita Devi Bishnoi
National Award for wildlife
conservation in the memory of Amrita Devi Bishnoi, who
sacrificed her life along with
363 others for the protection of ‘Khejri’ trees in Khejrali
village near Jodhpur in
Rajasthan in 1731.
7. (a) How can development of efficient engines ensuring
complete combustion of fossil fuel
be useful to us?
(b) Name the four elements that constitute fossil fuels.
[2011 (T-II)]
Ans. (a) The development of efficient engines ensuring
complete combustion of fossil fuel be
useful to us in order to increase efficiency and reduce air
pollution.
(b) Fossil fuels are formed of carbon, hydrogen, nitrogen
and sulphur.
8. Suggest two methods by which our consumption of coal and
petroleum can be reduced.
[2011 (T-II)]
Ans. Consumption of coal and petroleum can be reduced by
(i) Using alternate sources of energy, e.g., solar energy or
biogas fuel. Wherever possible.
(ii) Avoiding wastage of energy by switching off lights,
fans, TV and other domestic gadgets
not in use.
9. Give two reasons why, there is a need of switching over
from fossil fuels to the other sources
of energy. Name any two alternative sources of energy. [2011
(T-II)]
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Ans. We need to switch over from fossil fuels to the other
source of energy because their over
exploitation will not only deplete them faster but will also
add unwanted by-products of
combustion to the environment which are harmful for humans
as well as other living thing.
Solar energy and biogas fuel are alternative source of
energy.
10. We should use coal and petroleum judiciously. Why? State
any four reasons. [2011 (T-II)]
Ans. We need to use fossil fuels judiciously because
(i) Their over-exploitation will deplete them faster.
(ii) They will add unwanted by-products of combustion to the
environment which are
harmful for humans as well as other living things.
(iii) Fossil fuels are formed of carbon, hydrogen nitrogen
and sulphur. On combustion, they
produce carbon dioxide, water, oxides of nitrogen and oxides
of sulphur and carbon
monoxide (when carbon burns in insufficient oxygen). The
oxides of sulphur and
nitrogen and carbon monoxide are poisonous at high
concentrations and are considered
as major air pollutant.
(iv) Carbon dioxide is a greenhouse gas and increase of CO2
in atmosphere may lead to
intense global warming.
11. An environmentalist on a visit to your school suggested
the use of three R’s to save the
environment. Explain what he meant of three R’s and how
would you follow his advice at
home? [2009, 2011 (T-II)]
Ans. We can save our environment by practising three R’s —
Reduce, Recycle and Reuse.
(i) Reduce : This means that you use less. We can save
electricity by switching off lights
and fans when they are not required. We can save water by
repairing leaky taps. We can
save papers by using both sides of paper and make rough
notepads out of waste papers
and old calendars.
(ii) Recycle : This means using the same resource again and
again, but in a modified form.
Organic waste (from plant food source) can be allowed to rot
and manure can be prepared.
We should collect the used and discarded items of plastic,
paper, glass and metals and
send them for recycling to get these items again for use.
(iii) Reuse : This means using the same resource again in
the same form, such as refilling
cola bottles. Instead of throwing away used envelopes, you
can reverse it and use it again.
12. What is water harvesting? Mention any two water
harvesting structures. [2009, 2011 (T-II)]
Ans. Water harvesting is the activity of direct collection
of rainwater. The rainwater collected can
be stored for direct use or can be recharged into the
ground.
Examples of water harvesting structures :
(a) Bundhis in M.P. and U.P.
(b) Khadins, tanks and nadis in Rajasthan.
13. List four changes you would incorporate in your
lifestyle in a move towards sustainable use
of available resources. [2010]
Ans. (i) We should use public transport. Travel in buses,
trains and walk short distances.
(ii) We should use both sides of paper and make rough
notepads out of waste papers and old
calendars.
(iii) We should not leave taps open while brushing teeth or
while washing utensils.
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(iv) We should stop the wastage of electricity by switching
off electrical appliances when not
required.
14. What are natural resources? State two factors that work
against an equitable distribution of
these resources. [2009]
Ans. Natural resources are the components of the environment
which are essential for sustaining
life on earth, e.g., wildlife, water, forest, etc.
Factors that work against an equitable distribution of
natural resources are :
(a) Geographical and climatic differences at different
places on the earth.
(b) Man's activities like hunting, cutting of trees, etc.
15. Why must we conserve our forests? List any two causes
for deforestation taking place. [2009]
Ans. Forests are "biodiversity hotspots". A wide
range of different life forms — bacteria, fungi,
ferns, flowering plants, nematodes, insects, birds,
reptiles, etc. are present in a forest. One of
the main aims of conservation is to preserve the
biodiversity we have inherited.
Causes of deforestation :
(a) Deforestation is caused due to requirement of more land
by growing population for
food, house and industrialisation.
(b) Deforestation is caused due to expansion of crop-land.
16. List any four measures for conserving forests. [2009]
Ans. (a) Social forestry : It involves the raising of
fast-growing trees to meet the demands of the
community and reduce the stress on forest.
(b) Afforestation : It helps in the restoration of the
ecological balance.
(c) Silviculture : It means reforesting those forest lands
from where large number of trees
have been cut in a planned way.
(d) By awakening the people and encouraging them not to over
use the materials obtained
from the forests.
17. What is Chipko movement? Why should we conserve forests?
[2009]
Ans. The Chipko movement was a movement of the local people
to resist the deforestation attempt
on the hill slopes. It was started in early 1970s in village
Reni in Garhwal.
We should conserve forests because :
(a) Forests preserve the biodiversity.
(b) Forests maintain a perfect water-cycle and oxygen level
in nature.
(c) Forests prevent soil erosion and occurrence of floods.
(d) Forests produce a large quantity of raw materials for
industries.
18. Suggest any four changes that you would like to be incorporated
in the lifestyle of students
of your age to move towards a sustainable use of available
resources. [2009]
Ans. I would like to incorporate the following changes in
the lifestyle of students :
(a) They should use public transport. Travel in buses,
trains and walk short distances.
(b) They should use both sides of paper and make rough
notepads out of waste papers and
old calendars.
(c) They should not leave taps open while brushing teeth or
while washing utensils.
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(d) They should stop the wastage of electricity by switching
off electrical appliances when
not required.
19. Write two advantages of classifying energy sources as
renewable and non-renewable. [2008]
Ans. (i) Stress should be laid on exploitation of renewable
sources of energy like solar energy.
(ii) We can prevent the depletion of non-renewable sources
of energy by their judicious use.
20. What are fossil fuels? Give two examples of fossil
fuels. [2008]
Ans. Fossil fuels are energy yielding carbon containing
combustible substances formed millions of
years ago from degeneration of vegetation under high
pressure, heat and anaerobic
conditions. Examples – Coal and petroleum.
21. Why should we conserve forests? Suggest any two ways to
conserve forests. [2008]
Ans. We must conserve forests to preserve the biodiversity
because it is the home of a large variety
of plants and animals. Two ways to conserve forests are :
(i) Social forestry to meet the demands of community and
reduce the stress on forest.
(ii) Afforestation helps in the restoration of the
ecological balance.
22. State two reasons each for conserving (a) forests (b)
wildlife. [2008]
Ans. Reasons for conserving –
(a) Forests :- (i) To preserve the biodiversity we have
inherited.
(ii) To increase the economical benefits.
(b) Wildlife :- (i) To make a balance in ecosystems.
(ii) To preserve the rare species of plants and animals.
Other Important Questions
1. Write the two important purposes of building large dams?
Ans. Large dams are built for various purposes —
(i) to ensure the storage of water for irrigation as well as
for generating electricity.
(ii) to distribute water to large distances by building
canal systems.
2. What is meant by sustainable development? Give its main
objective. (V.Imp.)
Ans. Sustainable development means development which meets
the needs of the present
generation as well as of the future generation. The main
objective is to maintain a healthy,
pollution free environment.
3. Where was Chipko movement started ? Name two persons who
took an active role in it. (V.Imp.)
Ans. Chipko Movement was started in early 1970s in village
Reni in Garhwal.
Chandi Prasad Bhatt and Sunderlal Bahuguna took active role
in Chipko Movement.
4. What is the meaning of recycle? Why is 'Reuse' better
than recycling ?
Ans. Recycle means using the same resource again and again,
but in a modified form.
"Reuse" is in a way better than recycling because
the energy used for recycling the resources
is not used in case of reuse.
5. What is water harvesting? Give any two advantages of
water harvesting.
Ans. Water harvesting is the activity of direct collection
of rainwater. The rainwater collected can
be stored for direct use or can be recharged into the
ground.
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R S P R A K A S H A N
Advantages of water harvesting :
(i) Rain water can be stored for recharging aquifers inside
the soil for withdrawal later.
(ii) Rain water can be stored for ready use in containers
above and below the ground.
6. Why should we conserve forests? Give four reasons. (Imp.)
Ans. We should conserve forests because :
(a) Forests preserve the biodiversity because they are the
home of a large variety of plants
and animals.
(b) Forests maintain a perfect water cycle and oxygen level
in nature.
(c) Forests prevent soil erosion and occurrence of floods.
(d) Forests produce a large quantity of raw materials for
industries.
7. Name two NGOs working in the field of conserving the
environment in India.
Ans. (i) Kalpavriksh, New Delhi.
(ii) Bombay Natural History Society (BNHS), Mumbai.
8. What are the advantages of storing the underground water?
Give any four reasons.
Ans. The advantages of groundwater storage :
(i) It does not evaporate.
(ii) Provides moisture to crops.
(iii) Can be utilised by the local people.
(iv) Remains protected from contamination.
C. Short Answer Questions - II [3 Marks]
Previous Years' Questions
1. ‘‘Industrialization is one of the main cause of
deterioration of environment’’. List any four
reasons in favour of this statement. [2011 (T-II)]
Ans. Industries consider forests as sources of different
types of raw materials. If the raw material
in one forest is exhausted, they get the raw materials from
another forest. In such a way they
do have a major stake in the conservation of forests,
although they may be responsible for
its unsustainable use.
Mining causes pollution because of large amounts of slag
which is discarded for every tonne
of metal extracted. Burning of fossil fuels gives out all
kinds of gases in the atmosphere
causing air pollution. Building of dams causes large areas
to submerge. Various industries
release various pollutants into the air, water and soil.
Thus, on the one hand our natural
resources are getting depleted and on the other hand we are
polluting the earth's environment
which can regenerate those natural resources to some extent.
2. What is meant by exploitation of resources with short
term aims? List its four advantages.
[2009]
Ans. To fulfil the short term needs of the present
generation by exploitation of resources.
Advantages :-
(i) Huge profit can be achieved without any accountability.
(ii) If the resources are exploited to the hilt with
short-term aims, then the present generation
benefits largely.
(iii) This can meet the basic needs of the present
generation.
(iv) It minimises the damage caused to the environment.
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R S P R A K A S H A N
3. What is Chipko movement? How did this movement ultimately
benefit the local population
and the environment? [2009]
Ans. The Chipko movement was a movement of the local people
to resist the deforestation
attempt on the hill slopes. It was started in early 1970s in
village Reni in Garhwal. The
women of Reni literally clasped the trees, thus preventing
the workers of the contractor to
cut the trees.
Benefits of Chipko movement to the local population
(i) The Chipko movement helped in the conservation of
forests.
(ii) The 'Chipko andolan' forced the government to whom the
forest belongs, to re-think their
priorities in the use of forest produce.
(iii) It helps to conserve forests, maintain ecological
balance and prevent floods and soil
erosion.
(iv) It also helps in the availability of forest materials
for the future generations.
4. What is dam? Write two main advantages and two
ill-effects of constructing a big dam.
[2009]
Ans. Dams are the large water storing bodies that are
usually build by government agencies across
the rivers to regulate the flow of water and generate
electricity. They store huge amount of
water for irrigation of fields throughout the year.
Advantages of Dams :
(i) Large dams store adequate amount of water for irrigation
through a canal system. The
canal systems can transfer large amounts of water to great
distances which helps in
raising agricultural production in far away places. e.g,
Indira Gandhi canal originating
from Bhakra dam in Punjab has brought greenary in many parts
of Rajasthan.
(ii) Large dams ensure uninterrupted water supply in
surrounding areas and stored water is
also supplied to neighbouring towns and cities through
pipelines.
Ill-effects of Dam :-
(i) Social problems : Due to construction of high rise dams,
a vast area of land gets
submerged under water resulting in displacement of large
number of people. These
displaced people do not get adequate compensation or
rehabilitation.
(ii) Economic problems : The construction of high-rise dams
involves spending of huge
amount of public money and the benefits generated by these
projects are not proportional
to the expenditure.
5. What is meant by sustainable management? The
environmentalists are insisting upon
"sustainable natural resources management"? State
its four advantages. [2009]
Ans. Sustainable management is controlling the use of
resources in such a way as to provide for
its equitable and continuous availability to the present generation
as well as for future
generations without any harmful impact on the environment.
Environmentalists insist on
sustainable natural resources management because of
following advantages :-
(i) The resources would be made available to all sections of
the society.
(ii) The exploitation is restricted so as to meet the
judicious demands of the society.
(iii) Technology is employed to ensure minimum wastage
during processing of the resource.
(iv) The waste of the processing units is not allowed to degrade
the environment. Instead
proper safety measures are taken to convert the waste into
useful product.
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R S P R A K A S H A N
Other Important Questions
1. List any six changes you can suggest in your home in
order to be environment friendly.
Ans. (i) Use CFL instead of ordinary filamented bulbs.
(ii) Stop wearing fur coat.
(iii) Use solar cooker for cooking food whenever possible.
(iv) Use solar heater to heat water in winters.
(v) Reuse the empty metallic, plastic and glass containers.
(vi) Walk on foot for short distances.
2. State three advantages of constructing dams across the
rivers. (Imp.)
Ans. (i) Water from a dam is used for irrigation in fields
through a network of canals. Dams
ensure continuous water supply to the crop fields and help
raise agricultural production.
(ii) Water from a dam is supplied to the people in towns and
cities through pipelines after
suitable treatment. So construction of dams ensures
continuous water supply to the
people of that region.
(iii) The falling water from the dam is used for generating
electricity. The water rushing
down the dam turns turbines which run electric generators.
3. Despite good rains, we are not able to meet the demand of
water for all the people in our
country. Explain, why? (V.Imp.)
Ans. Despite good rains, we are not able to meet the demand
of water for all the people in our
country.
The main reasons are —
(i) Rapidly increasing population.
(ii) Lack of sufficient vegetation covered area.
(iii) Cemented areas surrounding the houses do not enable
the rain water to seep into the
ground.
(iv) High yielding varieties need more water for irrigation.
(v) Discharge of sewage and other wastes into the water
bodies makes water unfit for use.
(vi) Consumption of water per person per day is continuously
increasing in urban areas.
4. Give three advantages of rain water harvesting.
Ans. (i) Rain water harvesting in rural areas results in
increase of agricultural products and hence
the income of farmers.
(ii) Rain water harvesting reduces the effect of droughts on
agricultural production.
(iii) Rain water harvesting reduces the effect of floods and
reduces the risk of damage to dams
in the downstream area.
5. Quote three instances where human intervention saved the
forests from destruction. (Imp.)
Ans. (i) Amrita Devi Bishnoi sacrificed her life along with
a number of other people for the
protection of khejri trees in Khejarli village of Jodhpur in
Rajasthan.
(ii) Chipko movement was started in early 1970s in a small
hilly village of Tehri-Garhwal
thus preventing the workers from falling the trees.
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R S P R A K A S H A N
(iii) In 1972, a forest officer A.K. Banerjee of Arbari
forest range of Midnapore involved the
villagers in foresting and allowed them to collect the fuel
wood and fodder at a nominal
fee. With the active participation of the local community,
the sal forests of Arbari was
revived.
D. Long Answer Questions [5 Marks]
Other Important Questions
1. Prepare a list of activities that you perform daily in
which natural resources can be conserved
or energy utilisation can be minimised. [HOTS]
Ans. We can perform the following activities to conserve or
minimise the use of natural resources :
(i) To stop misuse of water.
(ii) To stop misuse of electrical energy.
(iii) Maximise the use of solar energy.
(iv) To make PUC check for cars regularly.
(v) To make others aware about environmental conditions.
(vi) To say 'No' to plastic bags.
(vii) To separate garbage as biodegradable and
non-biodegradable.
(viii) To compost organic wastes.
(ix) To stop burning garbage.
(x) To reduce paper consumption.
(xi) Not to litter.
(xii) To avoid chemical pesticides and other toxic
substances.
(xiii) To gave emphasis on three R's — Reduce, Recycle and
Reuse.
(xiv) To use manure instead of fertilisers.
(xv) Walk for the short distances instead of using personal
vehicle.
2. Write in brief about various forest resources or
stakeholders of the forests and their influence
on each other. (V.Imp.)
Ans. The stakeholders are persons or parties having a
binding interest in an asset. Forests have
four types of stakeholders :
(i) Locals : The people who live in or around forests and
are dependent on forest produce
for various aspects of their life.
(ii) The forest department : It is a government body which
owns the land and controls the
resources from forests.
(iii) The industrialists : They consider the forest as a
source of raw material for industries
but are not interested in its sustainability. e.g. Tendu
leaves are collected for making
bidis, trees are cut for making papers.
(iv) Wildlife and nature enthusiasts : They want to conserve
forests in their natural, unused form.
The influence of forests and its stakeholders on each other
(1) Large quantities of firewood, small timber and thatch
are needed by the locals from the
forests. Local people also gather fruits, nuts and medicines
from the forests. Forests are
also used for grazing cattle or fodder for cattle is
collected from the forests.
(2) The local people living in the forest areas for centuries
have developed practices that
ensure the use of resources in sustainable manner.
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R S P R A K A S H A N
(3) The forest department has taken over the control of
forests from Britishers in
independent India. Excessive cutting of trees and
over-expolitation of small areas
resulted in large scale deforestation.
(4) The forest department has also ignored local knowledge
and local needs in managing
forests. In order to earn more revenue and to cater to the
requirement of industrialists,
the forest department has cleared vast tracts of forests and
converted them into
monocultures of Pine, Teak, Sal and Eucalyptus. This has
destroyed a large amount of
biodiversity in those areas.
3. How does the over exploitation of fossil fuels affect our
health? Give any five changes in
our daily life or habits by which we can reduce the use of
fossil fuels.
Ans. We need to use fossil fuels judiciously because their
over-exploitation will not only deplete
them faster but will also add unwanted by-products of
combustion to the environment
which are harmful for humans as well as other living things.
Fossil fuels are formed of
carbon, hydrogen, nitrogen and sulphur. On combustion they
produce carbon dioxide, water,
oxides of nitrogen and oxides of sulphur and carbon monoxide
(when carbon burns in
insufficient oxygen). The oxides of sulphur and nitrogen and
carbon monoxide are
poisonous in high concentrations and are considered as major
air pollutant.
Simple choices can make a difference in our energy
consumption patterns e.g.
(1) Taking a bus instead of using personal vehicles like
cars or bikes saves energy and
money, reduce both air pollution and traffic congestion.
(2) Walking and cycling to nearby places is good for health
as well as environment
friendly.
(3) Using flourescent tubes instead of bulbs can save both
energy as well as money.
(4) Taking stairs instead of lift burns extra calories, tone
muscles and saves electricity.
(5) Wearing an extra sweater instead of using heating
devices on cold days saves energy
and prevents drying of air which causes respiratory
problems.
II FORMATIVE ASSESSMENT
A. Quiz
1. In our country, there are attempts to increase the height
of several existing dams like Tehri
and Almati, dams across Narmada. What are the reasons behind
it?
Ans. Dams are large water storing bodies that are usually
built by government agencies across the
rivers to regulate the flow of water and generate electricity.
They store huge amount of
water for irrigation of fields throughout the year.
2. On the banks of the river, there are several factories
that are discharging effluents into the
river. The pH of water sample collected from the river is
found to be acidic in the range of
3.5–4.5. Name the effluents which is the most likely to
cause the lowering of pH of river
water. What should be the effect of pollution on the fishes
of the river.
Ans. Untreated sewage, garbage, some human activities like
bathing, washing of clothes and
immersion of ashes or unburnt corpses are the most likely
causes of lowering of pH of river
water. It makes the water toxic and kills the aquatic
organisms.
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G O Y A LB R O T H E R SP R A K A S H A N
B. Puzzles
1. Look across, up and down in the grid to find the
answer of the following questions :
(i) Water harvesting structure in Himachal Pradesh.
(ii) First national park of India.
(iii) Water harvesting structure in Karnataka.
(iv) Water harvesting structure in M.P.
(v) Bacteria indicating contamination of water with
untreated sewage.
(vi) Water harvesting structures in Maharashtra.
Ans. (i) Kulhs (ii) Corbett (iii) Kattas
(iv) Bundhis (v) Coliform (vi) Tals
2. Hug the tree movement was a movement of the local
people to resist the deforestation attempt on the hill
slopes. The movement originated from an
incident in a village Reni in Garhwal during the early
1970's. There was a specific name for
such a movement. To spell it, first write down the letters
that occur before each of the given
letters. Then unscramble the word, to get the name of the
movement—
JLPQDI
Ans. CHIPKO
C. Group Activities
1. Prepare a list of forest materials that you use. What
products do a person living near a hill forest
would use? Also prepare a list of forest products used by a
person living in a desert. Discuss
with your friends if there are differences in the various
lists.
2. Study the rainfall pattern in different parts of India.
Mark the areas with abundant rainfall and
regions of water scarcity. You will find that the regions of
water scarcity are also the regions
of acute poverty. Find out the connection between water
scarcity and acute poverty.
D. Debates
1. Dams can add to global warming.
2. Agroforestry reduces pressure on the forests.
E. Group Discussions
1. In the absence of forest cover, the summer becomes hotter
while the winters become extra cool.
2. Ganga Action Plan was formulated to reduce pollution load
on river Ganga.
F. Surveys
1. Visit a town or village that you have seen a few years
back and find out :
(a) New roads and buildings that have come up.
(b) Work out a list of materials that have been used in
building new roads and houses.
(c) Where have these materials come from?
2. Visit a nearby national park and observe carefully :
(a) The effect of building rest houses for tourists.
(b) The effect of throwing of plastic bottles, covers and
other litter by the tourists.
(c) The effect of allowing grazing of domestic animals.
C L P R E S E V E K
O O B I R T N S C U
L A R S E M T P O L
I Y T B M R V Q N H
F L L U E N T R S S
O P R N K T U K E V
R A J D M A T L T R
M L O H I L N H I I
N A C I E S F G O K
C U W S K A T T A S
P D I T E C M E N H
