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Humus is an example of

A. soil structure

B. organic colloids

C. crystalloids

D. none of the above

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  1. Vegetation in Delhi is predominantly
  2. Silent valley is situated in
  3. Autumn colouration of leaves appears only in
  4. Hie earliest settlers on barren lands are generally
  5. The ultimate source of energy for fish is
  6. Mark which is true
  7. The nitrifying bacteria which oxidise nitrite to nitrates include
  8. Increasing accumulation of DDT in organisms of a food chain in higher trophic levels is known as
  9. Competition for food, light and space is most severe in
  10. Hydrilla is a
  11. A habitat of long severe winters and growing season limited to a few months of summer constitutes
  12. When young plants are grazed too heavily they get killed because
  13. Which is the correct food chain
  14. Hie sequence blue green algae > crustose lichens foliose lichens > mosses shrubs dicotyledonous…
  15. Smog is a common pollutant in places having
  16. Carbon cycle includes
  17. Laterization is a process which results in the
  18. Which of the following functions performed by forests help most in controlling drought
  19. Deforestation may reduce the chances of
  20. Desert plants are generally
  21. An American plant which had become a troublesome weed in India is
  22. A pollutant is any substance, chemical or other factor that changes
  23. The food chain in which microorganisms break down the energy-rich compounds synthesized by producers…
  24. One of these is a renewable source of energy:
  25. The biggest herbarium of India is
  26. The source of energy in the ecosystem is:
  27. An area of soil is thoroughly wetted and allowed to drain until capillary movement of water is stopped.…
  28. What will happen if our water resources are continued to be polluted by industrial wastes
  29. In cities like Mumbai and Delhi, the major air pollutants are
  30. What is the major constituent of biomass of an organism