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C 3 Cycle needs 18 ATP molecules for synthesis of one molecule of glucose whereas the C 4 cycle needs 30 ATP molecules. Due to high energy requirement C 4 cycle is more energy expensive than the C3 cycle.

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Photosynthesis in Higher Plants

Short Answer Type

51. How is C₄ pathway more energy expensive that C₃ ?

C₃ Cycle needs 18 ATP molecules for synthesis of one molecule of glucose whereas the C₄cycle needs 30 ATP molecules. Due to high energy requirement C₄ cycle is more energy expensive than the C3 cycle.

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