KCET · BIOLOGY · STD 12 - 12. Ecosystem

Identify the incorrect statement regarding the flow of energy between various components of the food chain.

A Each trophic level loses some energy as heat to the environment.
B The amount of energy available at each trophic level is 10% of previous trophic level.
C Energy flow is unidirectional.
D Green plants capture about 10% of the solar energy that falls on leave.

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Answer & Solution

Correct Answer

(D) Green plants capture about 10% of the solar energy that falls on leave.

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Detailed explanation

(D) Green plants capture about 10% of the solar energy that falls on leave.,
Green plants capture about 1% of the energy from sunlight that falls on their leaves. This energy is used in the process of photosynthesis to convert the light energy into chemical energy. The chemical energy is stored as food.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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