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Photosynthesis is important to life on earth mainly because it

(a) fixes atmospheric nitrogen Your answer
(b) releases CO₂ into the atmosphere Your answer
(c) is the primary source of all food and releases O₂ Correct
(d) breaks down glucose to release energy Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

Photosynthesis is the primary source of all food on earth and it releases O₂ into the atmosphere.

Why the other options are wrong

(a) · your answer Nitrogen fixation is done by certain bacteria, not by photosynthesis.
(b) · your answer Photosynthesis takes in CO₂; it does not release it.
(d) · your answer Breaking down glucose for energy is respiration.

NCERT point: Photosynthesis is the basis of life on earth.

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