Question

Assertion (A): Plants help to purify air by taking in carbon dioxide.

Reason (R): Carbon dioxide is used in photosynthesis.

• A. A is true and R is false.
• B. A is false and R is true.
• C. Both A and R are true and R is the correct explanation for A.
• D. A and R both are true but R is not the correct explanation for A.

Answer 1

The correct option is C Both A and R are true and R is the correct explanation for A.

Animals exhale carbon dioxide during breathing. Plants take up that carbon dioxide during photosynthesis and release oxygen. Hence, Priestley hypothesised that air produced during animal respiration could be converted into oxygen rich air by plants.
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