A) three plants of the same type are are grow under identical conditions except one is provided with violet light, one with green light, and one with yellow light. identify the photopigments that most efficiently absorb light in each of these ranges.

Three plants of the same type are are grow under identical conditions except one is provided with violet light, one with green light, and one with yellow light. The photopigments that most efficiently absorb light in each of these ranges  are chlorophyll a, absorbing blue-green ; chlorophyll b, absorbing yellow-green; carotene absorbing an orange pigment; xanthophyll absorbing yellow; phaeophytin a absorbing gray-brown  and Phaeophytin b, absorbing yellow-brown.

The synthetic organic pigments are: alizarin, azo-pigments in the yellow, orange and red color range, phthalocyanine in the blue and green color range and quinacridone  whic is a lightfast red-violet pigment.

Explanation:

Chlorophylla-a, the main pigment for light dependent photosynthesis is a chlorin that absorbs yellow and blue wavelengths of sunlight while reflecting green. There are other pigments such as: cholorphyll b, carotenoids (beta-carotene) which are red or yellow tetraterpenoids, xanthophylls and anthocyanins which help chlorophyll a molecules by absorbing an extended spectrum of light waves.

In fact there are several types of chlorophyll, but all land plants contain chlorophyll a and b which are identical in composition apart from one side chain, composed of a -CH3 in chlorophyll a, while in chlorophyll b it is -CHO.

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