Why rhodophyta exhibit red colour ?

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Since most rhodophyta grow at great depths, the chlorophyll can only absorb light in the red area of the spectrum.

They absorb mostly blue light and loss some the light energy as red light.

Red pigment of rhodophyta absorbs all the light waves.

The light reaching the greatest depth in water is in the blue-green region of the spectrum, is absorbed by phycoerythrin.

answer is B.

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Detailed Solution

Rhodophyta are commonly called as red algae because of the predominance of the red pigment (r – phycoerythrin) in their body. They occur in both well lighted regions close to the surface of water and also at great depths in ocean where relatively little light penetrates. They exhibit a red colour because the wavelengths of light that are absorbed by chlorophyll are blue light absorbed by phycoerythrin and it looses some of the energy as red light.

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