Hie earliest settlers on barren lands are generally

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1. Correct definition of ecosystem is :
2. Commensalism is
3. Desert plants are generally
4. The best indicator of SO^2 pollution is
5. A habitat of long severe winters and growing season limited to a few months of summer constitutes
6.   Which of the following is normally not at atmospheric pollutant
7. Radiation is a health hazard as it causes
8. Smog is a common pollutant in places having
9. Hydrilla is a
10. Silent valley is situated in
11. Autumn colouration of leaves appears only in
12. The food chain in which microorganisms break down the energy-rich compounds synthesized by producers…
13. First link in any food chain is green plant because
14. In grassland ecosystem the pyramid of energy is
15. The first stage of plant succession on earth is called
16. What is the major constituent of biomass of an organism
17. An area of soil is thoroughly wetted and allowed to drain until capillary movement of water is stopped.…
18. The nitrifying bacteria which oxidise nitrite to nitrates include
19. Mark which is true
20. Increasing accumulation of DDT in organisms of a food chain in higher trophic levels is known as
21. Which of the following functions performed by forests help most in controlling drought
22. Tropical evergreen forests are seen in
23. Primary treatment of sewage means
24. In cities like Mumbai and Delhi, the major air pollutants are
25. Pedology is the study of
26. When young plants are grazed too heavily they get killed because
27. Water plants usually have
28. . Biome is
29. Soil particles arranged in order of increasing size are
30. Hie sequence blue green algae > crustose lichens » foliose lichens > mosses » shrubs » dicotyledonous…

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