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Photosynthesis

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Question

What is the source of oxygen gas in air?

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Solution

Photosynthesis by green plants is source of oxygen gas in air.

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Q2. (a) What are the different constituents of air?

(b) Which is the most abundant gas present in the air? Give the relative abundance of the oxygen gas present in the air.

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Q. Assertion :Respiration in animals is more affected than in green plants by the increasing effects of air pollution and decreasing oxygen content in the inhaled air. Reason: The source of oxygen for respiration in green plants is atmospheric air and oxygen from photosynthesis.

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