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Question
Explain why respiration is said to be a reversal of photosynthesis?
Solution
Respiration is said to be the reverse of photosynthesis due to the following reasons:
(1) In respiration, the organic food is broken down into its inorganic compounds, i.e., CO2 and H2O, while in photosynthesis the organic food is synthesized from its inorganic components, i.e., CO2 and H2O.
(2) In respiration, CO2 is given out, while in photosynthesis CO2 is consumed.
(3) In respiration, O2 is consumed, while in photosynthesis O2 is released or evolved.
(4) In respiration, energy is liberated, while in photosynthesis energy is absorbed.
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