The first stage of plant succession on earth is called

A. Adaptation

B. Acclimatisation

C. Colonisation

D. All the above

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  1. The food chain in which microorganisms break down the energy-rich compounds synthesized by producers…
  2. One of these is a renewable source of energy:
  3. A habitat of long severe winters and growing season limited to a few months of summer constitutes
  4. When young plants are grazed too heavily they get killed because
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  7. Vegetation in Delhi is predominantly
  8. Soil particles arranged in order of increasing size are
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  13. What is the major constituent of biomass of an organism
  14. Pedology is the study of
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  16. Radiation is a health hazard as it causes
  17. The source of energy in the ecosystem is:
  18. Hie earliest settlers on barren lands are generally
  19. What will happen if our water resources are continued to be polluted by industrial wastes
  20. Smog is a common pollutant in places having
  21. Which is the correct food chain
  22. Competition for food, light and space is most severe in
  23. Autumn colouration of leaves appears only in
  24. Which one of the following is associated with the conservation of forest ?
  25. Commensalism is
  26. An area of soil is thoroughly wetted and allowed to drain until capillary movement of water is stopped.…
  27. An American plant which had become a troublesome weed in India is
  28. Correct definition of ecosystem is :
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