BIOSPHERE

BIOSPHERE

1. The term ecosphere for biosphere was used by

a. odum b. Cole c. Daubenmire d. Raunkiaer

2. Source of energy in the biosphere is

a.. Producer b. Decomposer c. Sun d. Heat of earth

3. An environment dominated by man and used by man alone is called

a. Biosphere b. Oosphere c. Noosphere d. Man and Biosphere (MAB)

4. The strata near to earth is

a. Thermosphere b. Stratosphere c. Mesosphere d. Troposphere

5. 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 a and b d. Neither a nor b

6. Environment is controlled by

a. Matter b. Energy c. Both d. Only b is correct

7. 0The environmental equilibrium is restored by

a. Producers b. Decomposers c. Consumers d. top consumers

8. In sedimentary cycles, the reserve pool is

a. air b. Water c. lithosphere d. Lithosphere and atmosphere

9. Bio geochemical cycles are also called

a. Nutrient cycles b. cycles of matter c. Both correct d. Only b is correct

10. Burning of fossil fuels affects

a. Nitrogen cycle b. Carbon cycle c. Phosphorus cycle d. water cycle

11. Phosphorus is mostly found in rocks in combination with

a. Calcium b. iron c. Aluminium d. All of these

12. Non biological nitrogen fixation is

a. Electrochemical b. Photochemical c. Both a and b d. None of these

13. Which of the following changes food into usable energy?

a. Phosphorus b. Calcium c. Magnesium d. Carbon

14. Which gas contributes most to green house effect on earth?

a. CO2 b. CH4 c. CFC d. Freon

15. Concentration of green house gases is increasing due to

a. Deforestation b. Increased use of refrigerators

c. Increased combustion of coal and petroleum d. All the above

16. Spaceship earth is an open as well as closed system. It is an open system with reference to

a. Materials b. Energy c. Gaseous cycles d. Sedimentary cycles

17. Maximum oxygen comes from

a. Phytoplanktons b. grassland c. Forests d. herbs and shrubs

18. Which is involved in sedimentary cycle?

a.C b. N c. H d. S

19. Global water cycle involves

a. Forest trees b. Algae c. Microorganisms

d. Evaporation of water from water bodies

20. A free living nitrogen fixing cyanobacteria is

a. Anabaena b. Aulosira c. Azotobacter d. All of these

21. Hydrological cycle is under the control of

a. Grasslands b. Forests c. Planktons d. Hydrophytes

22. In carbon cycle, source of carbon to plants is

a. Atmospheric CO2 b. Carbonate rocks c. Fossil fuels d. All of these

23. Phosphorus cycles in the form of

a. HPO-3 b. P2(gas) c. PO-34 d. Al2(PO4)3

24. The reservoir pool of carbon is

a. air and water b. Fossil fuels c. Rocks d. All of these

ANSWERS

1. b 2. c 3. c 4. d 5. c 6. c 7. b 8. c 9. c 10. b

11. d 12. c 13. a 14. a 15. d 16. b 17. a 18. d 19. d 20. b

21. b 22. a 23. c 24.d