Question

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

• A.
• B.
• C.
• D.

Answer 1

Answer: (A)

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 $430nm$ and $662nm$.
The absorption spectrum of chlorophyll-a includes wavelengths of blue and orange-red light as is indicated by their peaks, around $450-475$ and $650-675nm.$ Thus, option (a) is correct.