An element essential as electron carrier is

Potassium

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Zinc

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Calcium

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Iron

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Solution

The correct option is D Iron
Iron has the major function of electron transport in respiration and photosynthesis. It is present in cytochrome and ferredoxin which are the main electron carrier and transport electrons by the oxidation-reduction process during the respiration and photosynthesis respectively.
Thus, the correct answer is option D.

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