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Question

How plants do photosynthesis and respiration at the same time in the day as in respiration,oxygen is inhaled and carbon dioxide is exhaled and in photosynthesis,carbon dioxide is inhaled and oxygen is exhaled.So they are opposite.So how do they carry out both the processess at the same time?

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Solution

Photosynthesis and Cellular Respiration takes place in different parts of a plant. Photosynthesis occurs in the chloroplasts whereas Cellular Respiration takes place in the mitochondrion.
Hence both these processes do not interfere with each other. The gases produced by one can be used by the other.

Depending on the amount of sunlight, plants can give out or take in oxygen and carbon dioxide as follows.

Dark – Only respiration takes place. Oxygen is consumed while carbon dioxide is released.

Dim sunlight – Photosynthesis rate equals respiration rate. A plant consumes all the oxygen photosynthesis generates. It also uses all the carbon dioxide respiration creates. As a result, no gas exchange takes place with the environment.

Bright sunlight – Photosynthesis uses carbon dioxide and makes oxygen faster than respiration produces carbon dioxide and consumes oxygen. Extra oxygen is released into the atmosphere.

During daytime, photosynthesis produces oxygen and glucose faster than respiration consumes it. Photosynthesis also uses carbon dioxide faster than respiration produces it. Oxygen surplus is released into the air and unused glucose stored in the plant for later use.


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