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Question

Carbon dioxide is liberated during which of the following steps?

A
Photosynthesis
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B
Transpiration
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C
Ascent of sap
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D
Respiration
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Solution

The correct option is D Respiration
Plants, like all other living organisms, carry out mitochondrial respiration, the oxidation of substrates to CO2 and the conversion of O2 to H2O with the concomitant release of energy. Oxygen is consumed because respiration is essentially an oxidation process in which reduced substrates (produced in photosynthesis) are oxidised.

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