What is not true regarding iron ?

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Activator of catalase

It is micro element needed by plants in large quantities

Constituent of ring structure of chlorophyll a and plastocyanin

It is reversibly oxidised in electron transport when present in electron carriers

answer is C.

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Detailed Solution

Iron is not a constituent of the ring structure of chlorophyll a and plastocyanin.

Chlorophyll a is a green pigment found in photosynthetic organisms and is essential for the process of photosynthesis. It contains a porphyrin ring structure, which is composed of four nitrogen atoms and a magnesium ion at the center.

Plastocyanin is a copper-containing protein found in the thylakoid membrane of chloroplasts and is involved in the transfer of electrons during photosynthesis. It contains a single copper atom.

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