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Question

Assertion : CO2 easily diffuses from alveoli to tissues and CO2 from tissue to alveoli.

Reason : Alveoli is 2-celled thick and capillaries are thin walled.

A
Both A and R are true and R is the correct explanation of A
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B
Both A and R are true but R is not correct explanation of A
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C
A is true but R is false
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D
A and R are false
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Solution

The correct option is C A is true but R is false
CO2 easily diffuses from alveoli to tissue and vice vera because capillaries are thin walled and the alveoli are just one cell in thickness, which allows the gas exchange of respiration to take place rapidly.

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