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Question

Which of the following molecules is a product in respiration and substrate in photosynthesis?

A
O2
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B
CO2
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C
CO
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D
N2
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Solution

The correct option is B CO2
CO2 is released during respiration and forms the product of respiration. Whereas in photosynthesis, the carbon dioxide molecule is fixed to form glucose. Therefore CO2 forms the substrate in photosynthesis.

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