The first link in any food chain is always a green plant because

  • A
    They are widely distributed
  • B
    They are firmly fixed to the soil
  • C
    They alone have a capacity to fix atmospheric $CO_2$ in the presence of sunlight
  • D
    All of the above

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Suppose $2000 \; J$ of solar energy is incident on green vegetation. On the basis of the $10 \; \%$ law of Lindeman,identify $A, B$ and $C$ as shown in the figure.

At which of the following levels is the energy the lowest?

Given below are two statements.
Statement $I$ - The amount of energy available in an ecosystem increases at each successive trophic level.
Statement $II$ - Transfer of energy from one trophic level to the other follows $10\%$ law.
In the light of above statements, select the correct option given below:

The primary (main) source of energy for all ecosystems on Earth is ....... .

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