KCET · BIOLOGY · STD 12 - 12. Ecosystem

The amount of phtosynthetically active radiation captured by plants is

A 60-70 percent
B 20-30 percent
C 12-20 percent
D 2-10 percent

Verified Solution

Answer & Solution

Correct Answer

(D) 2-10 percent

Step-by-step Solution

Detailed explanation

(D) 2-10 percent,
2-10% of photosynthetically active radiation (PAR) is captured by plants. Photosynthetically active (PAR) is light of wavelengths 400-700 nm and is the portion if the light spectrum utilised by plants for photosynthesis. Out of total incident solar radiation, less than fifty percent of it forms photosynthetically active radiation or PAR.

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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