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Question
Which of the following molecules is a product in respiration and substrate in photosynthesis?
Options:
A .  O2
B .  CO2
C .  CO
D .  N2
Answer: Option B
:
B
CO2 is released during respiration and forms the product of respiration. Whereas in photosynthesis, the carbon dioxide molecule is fixed to form glucose. ThereforeCO2forms the substrate in photosynthesis.

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