Select the correct statement regarding gases present in the atmosphere.

Nitrogen present in the atmosphere is directly used by plants.

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Humans inhale only oxygen.

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During photosynthesis, oxygen is released.

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Argon is the most abundant gas present in the atmosphere.

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Solution

The correct option is C During photosynthesis, oxygen is released.
Atmosphere is made up of different gases. Nitrogen is the most abundant gas present in the atmosphere. Plants cannot use nitrogen directly. Bacteria, that live in the soil and roots of some plants, take nitrogen from the
air and change its form so that plants can use it.
Oxygen is the second most plentiful gas in the air. It is used by humans, animals and plants for breathing. When humans inhale they take in some amount of nitrogen also. Oxygen is released by plants during photosynthesis.

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Similar questions

(i) In plants, respiration happens during the night time only, while photosynthesis happens during the day.

(ii) In humans, the exchange of gases takes place in the alveoli.

(iii) Haemoglobin has a greater affinity for oxygen than carbon dioxide.

(iv) Aquatic organisms use the oxygen in the surrounding atmosphere for respiration.

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