Azotobacter and Clostridium are nitrogen fixing bacteria and found in
Nodulated roots
Leaves of certain plant
Free in soil
None of the above
It’s obvious.
Which one of the following statements is incorrect for secondary succession?
Community is a group of independent and interacting population of
Composition and structure of communities constantly change in response the changing environmental conditions. These changes lead finally to a community that is in near equilibrium with the environment and that is called a…….
Mass of living matter at a trophic level in an area at any time is called
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