KCET · BIOLOGY · STD 12 - 12. Ecosystem

Of the total incident solar radiation, the percentage of photosynthetically active radiation (PAR) captured by the plants is

A 10-20% of PAR only
B 2-10% of PAR only
C 0-10% of PAR only
D 30-40% of PAR only

Verified Solution

Answer & Solution

Correct Answer

(B) 2-10% of PAR only

Step-by-step Solution

Detailed explanation

(B) 2-10% of PAR only,
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. Out of which only 2-10% of PAR s captured by plats.

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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