Question

Why is chlorophyll-a called essential
pigment?​

Answer 1

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The chlorophyll in plant cell is an essential pigment because not only it gives green colour to the leaves but also it helps them to make food .

Answer 2

Answer:

Chlorophyll a is the major pigment in plants. It forms the reaction centre in Photosystem I and II and is involved in majority of light absorption. That is why, it is essential in plants. The other pigments are accessory pigments which transfer the absorbed energy to the chlorophyll a.