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Question

During Calvin cycle, ATP is not utilised during _______.

A
carboxylation
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B
reduction
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C
regeneration
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D
formation of triose phosphate
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Solution

The correct option is A carboxylation
Calvin cycle occurs in the stroma of chloroplast during which the sugars are synthesised. It includes three steps - carboxylation (carbon dioxide fixation), reduction and regeneration.

ATP is not utilised during carbon dioxide fixation step. During reduction and regeneration steps of the cycle, ATP is utilised. For every Calvin cycle, 3 ATP molecules are utilised.


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