Maximum absorption by chlorophyll-a is seen in (P). The maximum rate of photosynthesis is seen in (Q). The correct words filling (P) and (Q) are

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If we observe the absorption spectrum of chlorophyll-a, there is a large peak in the blue region while a smaller peak in the red region. Thus, maximum absorption by chlorophyll-a is seen in blue light. If we observe the action spectrum, we see that the maximum rate of photosynthesis is seen in red light. Thus, red light is better for photosynthesis.

Botany - Photosynthesis in Higher Plants Question with Solution | TestHub

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