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Light Absorbing Pigments

Chlorophyll a...

Question

Chlorophyll appears green due to

A

Absorption of green light

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B

Red fluorescence

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C

Green fluorescence

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D

Absorption of red and blue light

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Solution

The correct option is C Absorption of red and blue light
A) Green light is not absorbed by chlorophyll, but is reflected and so, chlorophyll appears green.
B) Red fluorescence is not related to the green appearance of chlorophyll.
C) Green fluorescence is not related to the green appearance of chlorophyll. Chlorophyll appears green as it reflects green light.
D) Chlorophyll appears green as it absorbs light in the red (long wavelength) and the blue (short wavelength) regions of the visible light spectrum. Green light is not absorbed but reflected, making chlorophyll appear green.
So the correct answer is 'Absorption of red and blue light'.

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