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The graph shows the absorption spectrum of chlorophyll a. Light of which colour is absorbed most?
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The graph shows the absorption spectrum of chlorophyll a. Light of which colour is absorbed most?
Your answer:
Correct answer: (d)
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Explanation
Why (d) is correct
The absorption spectrum of chlorophyll a has its highest peak in the blue region (around 430 nm), with a second peak in red (around 660 nm). So blue light is absorbed most.
Why the other options are wrong
- (a) · your answer Infra-red is outside the visible range and is not absorbed by chlorophyll for photosynthesis.
- (b) · your answer Green light is mostly reflected; that is why leaves look green.
- (c) · your answer Red light is strongly absorbed, but the peak in blue is higher.
NCERT point: Chlorophyll a absorbs mainly in the blue and red regions.
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