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  4. The graph below represents the absorption spectrum of a major pigment contributing to photosynthesis <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/biology/714416c8072bae7face1b7925e9ac158-.png /> Which one of the following b e s t represents the photosynthetic efficiency of the pigment?

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Q. The graph below represents the absorption spectrum of a major pigment contributing to photosynthesis image Which one of the following b e s t represents the photosynthetic efficiency of the pigment?

KVPYKVPY 2018

Solution:

The given graph represents absorption spectrum of chlorophyll-$a$. The photosynthetic efficiency graph can also be referred to as action spectrum. The set of wavelengths absorbed by a pigment is its absorption spectrum. Chlorophyll-a gives absorption peaks at $430\, nm$ and $662 \,nm$.
The absorption spectrum of chlorophyll-a includes wavelengths of blue and orange-red light as is indicated by their peaks, around $450-475$ and $650-675 \,nm.$ Thus, option (a) is correct.