Organisms described as chief producers of oceans have

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Biflagellate cells

Cellulosic cell wall in the form of plates

Soap box like cell wall made of silica

Chlorophyll a and b

answer is A.

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Detailed Solution

Diatoms are chief producers of oceans and have silicified cell wall in the form of soap box. Cell wall with cellulosic plates and biflagellate condition are seen in Dinoflagellates. Chlorophyll a and b are present in euglenoids, green algae and higher plants.

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