Question
Why is it usually difficult to demonstrate respiration in green plants?
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Answer
During day time, both photosynthesis and respiration takes place in green plants. Evolution of $CO_2$ is an indicator to demonstrate respiration in living organisms. $CO_2$ produced during respiration in plants gets utilized during photosynthesis and thus, there is no evolution of $CO_2$ Therefore, it is difficult to demonstrate respiration in green plants as there is no evolution of $CO_2$ during day time.
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