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The source of energy in the ecosystem is:

A. decomposition of animals and plants by bacteria

B. photosynthesis by green plants

C. fermentation of sugars

D. sun-light

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  2. When young plants are grazed too heavily they get killed because
  3. In grassland ecosystem the pyramid of energy is
  4. Hie sequence blue green algae > crustose lichens foliose lichens > mosses shrubs dicotyledonous…
  5. Vegetation in Delhi is predominantly
  6. The food chain in which microorganisms break down the energy-rich compounds synthesized by producers…
  7. Tropical evergreen forests are seen in
  8. Increasing accumulation of DDT in organisms of a food chain in higher trophic levels is known as
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  11. The ultimate source of energy for fish is
  12. Carbon cycle includes
  13. One of these is a renewable source of energy:
  14. The first stage of plant succession on earth is called
  15. Laterization is a process which results in the
  16. Which one of the following is associated with the conservation of forest ?
  17. What will happen if our water resources are continued to be polluted by industrial wastes
  18. An American plant which had become a troublesome weed in India is
  19. An area of soil is thoroughly wetted and allowed to drain until capillary movement of water is stopped.…
  20. Mark which is true
  21. The nitrifying bacteria which oxidise nitrite to nitrates include
  22. Commensalism is
  23. Competition for food, light and space is most severe in
  24. A pollutant is any substance, chemical or other factor that changes
  25. The least porous soil among the following is
  26. . Biome is
  27. Biologists celebrate 5th June as
  28. Plankton, Nekton and Itenthon are not the components of one of the following ecosystems:
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  30. Water plants usually have