CBSE Class 8 Science Conservation Natural Resources Assignment Set A

Q.1 Write the full form of the following:-

a) IUCN

b) UNEP

c) UNESCO

Q.2 Write the definition of the following:-

a) Vulnerable species

b) Rare species

c) Indeterminate species

Q.3 Differentiate between the following:-

a) National Parks and Sanctuaries

b) Critical Species and Endangered Species

c) Renewable and Non – Renewable

d) Afforestation and Deforestation

Q.4 Write short note on the following:-

a) Chipko Andolan

b) Global warming

c) Monoculture

d) Red Data Book

e) Shifting Cultivation

f) Carbonisation

Q.5 Fill in the blanks:-

a) The land under forest is called _________.

b) _________ is used for production of fertilizer.

c) _________ is used for extraction of metals from ores.

d) _________ and _________ can be used as raw material to prepare paper.

Q.6 Answer the following questions:-

a) Write the steps for conservation of wild life.

b) List any 4 advantages of forest.

c) What is biodiversity? How is it linked to our survival?

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NATURAL RESOURCES 10

Question. 1. Layer of ozone is present in
(a) Stratosphere
(b) Thermosphere
(c) Mesosphere
(d) Troposphere
Answer: A

Question. 2. The strata near to earth is
(a) Thermosphere
(b) Stratosphere
(c) Mesosphere
(d) Troposphere
Answer: D

Question. 3. Earth is protected from dangerous UV radiations by
(a) Oxygen layer
(b) \( CO_{2} \) layer
(c) Ozone layer
(d) Photochemical smong layer
Answer: C

Question. 4. Composition of air remains unchanged
(a) above height of 80 km
(b) below height of 60 km
(c) below height of 80 km
(d) none of these
Answer: C

Question. 5. The peak concentration of ozone above surface of earth is at
(a) 25 km
(b) 15 km
(c) 60 km
(d) 40 km
Answer: A

Question. 6. What is true for earth ?
(a) Earth is an open system as it receives energy
(b) Earth is a closed system as it does not take any new matter
(c) Both (1) and (2)
(d) Neither (1) nor (2)
Answer: C

Question. 7. Land forms ______ part of earth surface
(a) 30%
(b) 36%
(c) 50%
(d) 70%
Answer: A

Question. 8. Match the following:
1. Matter and energy (a) Environment
2. Atmospheric vapour (b) Living crust
3. Annual precipitation (c) \( 4.46 \times 10^{20} \)
4. Biosphere (d) \( \lambda \, 0.15 - 4\mu \)
5. Solar radiation (e) \( 0.13 \times 10^{20} \, G \)
(a) 1 (a) 2 (b) 3 (c) 4 (d) 5 (e)
(b) 1 (a) 2 (e) 3 (c) 4 (b) 5 (d)
(c) 1 (b) 2 (a) 3 (c) 4 (d) 5 (e)
(d) 1 (b) 2 (c) 3 (e) 4 (a) 5 (d)
Answer: B

Question. 9. Match the following:
1. sedimentary cycle (a) Gaseous cycle
2. water (b) soil
3. atmospheric nitrogen fixation (c) \( 140 - 700 \, mg / m^{2} / year \)
4. biological nitrogen fixation (d) \( 35 \, mg / m^{2} / year \)
5. biogenetic nutrients (e) essential exhaustible
(a) 1 (b) 2 (a) 3 (d) 4 (c) 5 (e)
(b) 1 (b) 2 (e) 3 (c) 4 (d) 5 (a)
(c) 1 (b) 2 (e) 3 (c) 4 (d) 5 (a)
(d) 1 (b) 2 (a) 3 (e) 4 (d) 5 (c)
Answer: A

Question. 10. Environment is controlled by
(a) matter
(b) energy
(c) both
(d) only (2) is correct
Answer: C

Question. 11. The process of evapo-transpiration and precipitation is known as
(a) carbon cycle
(b) hydrological cycle
(c) nitrogen cycle
(d) all of these
Answer: B

Question. 12. The environmental equilibrium is restored by
(a) producers
(b) decomposers
(c) consumers
(d) top consumers
Answer: B

Question. 13. The agent/s which make/s free atmospheric nitrogen available to plants is / are
(a) lightning
(b) free living nitrogen fixing bacteria
(c) symbiotic nitrogen fixing bacteria
(d) all of these
Answer: D

Question. 14. Study of Biogeochemical cycles is called Biogeochemistry. Its father is Vernadsky (= Winodgsky). It involves
(a) cycling of energy
(b) cycling of gases
(c) cycling of nutrients
(d) cycling of water
Answer: C

Question. 15. In sedimentary cycles, the reserve pool is
(a) air
(b) water
(c) lithosphere
(d) lithosphere and atmosphere
Answer: C

NATURAL RESOURCES 10

Question. 1. Layer of ozone is present in
(a) Stratosphere
(b) Thermosphere
(c) Mesosphere
(d) Troposphere
Answer: A

Question. 2. The strata near to earth is
(a) Thermosphere
(b) Stratosphere
(c) Mesosphere
(d) Troposphere
Answer: D

Question. 3. Earth is protected from dangerous UV radiations by
(a) Oxygen layer
(b) \( CO_{2} \) layer
(c) Ozone layer
(d) Photochemical smong layer
Answer: C

Question. 4. Composition of air remains unchanged
(a) above height of 80 km
(b) below height of 60 km
(c) below height of 80 km
(d) none of these
Answer: C

Question. 5. The peak concentration of ozone above surface of earth is at
(a) 25 km
(b) 15 km
(c) 60 km
(d) 40 km
Answer: A

Question. 6. What is true for earth ?
(a) Earth is an open system as it receives energy
(b) Earth is a closed system as it does not take any new matter
(c) Both (1) and (2)
(d) Neither (1) nor (2)
Answer: C

Question. 7. Land forms ______ part of earth surface
(a) 30%
(b) 36%
(c) 50%
(d) 70%
Answer: A

Question. 8. Match the following:
1. Matter and energy (a) Environment
2. Atmospheric vapour (b) Living crust
3. Annual precipitation (c) \( 4.46 \times 10^{20} \)
4. Biosphere (d) \( \lambda \, 0.15 - 4\mu \)
5. Solar radiation (e) \( 0.13 \times 10^{20} \, G \)
(a) 1 (a) 2 (b) 3 (c) 4 (d) 5 (e)
(b) 1 (a) 2 (e) 3 (c) 4 (b) 5 (d)
(c) 1 (b) 2 (a) 3 (c) 4 (d) 5 (e)
(d) 1 (b) 2 (c) 3 (e) 4 (a) 5 (d)
Answer: B

Question. 9. Match the following:
1. sedimentary cycle (a) Gaseous cycle
2. water (b) soil
3. atmospheric nitrogen fixation (c) \( 140 - 700 \, mg / m^{2} / year \)
4. biological nitrogen fixation (d) \( 35 \, mg / m^{2} / year \)
5. biogenetic nutrients (e) essential exhaustible
(a) 1 (b) 2 (a) 3 (d) 4 (c) 5 (e)
(b) 1 (b) 2 (e) 3 (c) 4 (d) 5 (a)
(c) 1 (b) 2 (e) 3 (c) 4 (d) 5 (a)
(d) 1 (b) 2 (a) 3 (e) 4 (d) 5 (c)
Answer: A

Question. 10. Environment is controlled by
(a) matter
(b) energy
(c) both
(d) only (2) is correct
Answer: C

Question. 11. The process of evapo-transpiration and precipitation is known as
(a) carbon cycle
(b) hydrological cycle
(c) nitrogen cycle
(d) all of these
Answer: B

Question. 12. The environmental equilibrium is restored by
(a) producers
(b) decomposers
(c) consumers
(d) top consumers
Answer: B

Question. 13. The agent/s which make/s free atmospheric nitrogen available to plants is / are
(a) lightning
(b) free living nitrogen fixing bacteria
(c) symbiotic nitrogen fixing bacteria
(d) all of these
Answer: D

Question. 14. Study of Biogeochemical cycles is called Biogeochemistry. Its father is Vernadsky (= Winodgsky). It involves
(a) cycling of energy
(b) cycling of gases
(c) cycling of nutrients
(d) cycling of water
Answer: C

Question. 15. In sedimentary cycles, the reserve pool is
(a) air
(b) water
(c) lithosphere
(d) lithosphere and atmosphere
Answer: C