why do chlorophylls absorb mostly red and blue regions of the spectrum and why photosynthesis does not occur in green light?

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Solution

Chlorophyll can only absorb certain wavelength of visible light spectrum. It absorbs only red and blue regions of the spectrum. Chlorophyll gets destroyed very easily by excess energy. For this reason they only absorb some amount of wavelengths specifically red and blue.
Chlorophyll cannot absorb green light. They normally reflect back the green light from the light spectrum. For this reason we can see the plant parts containing chlorophyll green. As they cannot absorb energy from green light they cannot perform photosynthesis also in green light.

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Similar questions

Q. Maximum absorption of light by chlorophyll a occurs in which regions of the absorption spectrum (a) Blue (b) Red (c) Green (d) Yellow

Q. Select the correct ones from the following.
A. Electrons are emitted from the light absorbed chlorophyll molecules.
B. Excited and expelled electrons undergo movement and result in the synthesis of ATP and the formation of NADPH

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.
C. Blue and red regions of the solar spectrum are responsible for photosynthetic dark reactions.
D. Greenlight spectrum plays a major role in light reaction of photosynthesis.

Why is the rate of photosynthesis minimum in green light and maximum in blue light??

Q. Why photosynthesis is more effective in red light and least effective in green light?

Question 53
In the figure given below, the black line (upper) indicates action spectrum for photosynthesis and the lighter line (lower) indicates the absorption spectrum of chlorophyll-a, answer the following

(a) What does the action spectrum indicate? How can we plot an action spectrum? Explain with an example.

(b) How can we derive an absorption spectrum for any substance?

(c) If chlorophyll-a is responsible for light reaction of photosynthesis, why do the action spectrum and absorption spectrum not overlap?

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