Which one of the following statements is true with respect to photosynthesis?

Oxygen evolved during photosynthesis comes from CO

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Chlorophyll a is the only essential pigment in plants

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Photosynthesis does not occur in chloroplast in plants

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Photosynthesis does not occur in red light

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Solution

The correct option is A Chlorophyll a is the only essential pigment in plants
The oxygen which is evolved during the process of photosynthesis is liberated due to the splitting of the water molecule.
The chlorophyll a is the essential pigment. All the other pigments trap the solar energy and transfer the energy to the chlorophyll a. The pigment allows the conversion of the light energy to chemical energy.
Photosynthesis cannot occur in the roots of the plants as there are no chloroplast.
Photosynthesis occurs in the regions of the red and blue light.
Thus, the correct answer is option B.

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