Mechanism and process of gas exchange — task. Biology CBSE Live product, Class 7 (2025-26).

Read the statements given below and choose the correct answer:

1.

Assertion	Lungs have alveoli for gas exchange.
Reason	Alveoli increase surface area for oxygen absorption.

Both assertion and reason are true, and the reason is the correct explanation
Both assertion and reason are true, but the reason is not the correct explanation
The assertion is true, but the reason is false
The assertion is false, but the reason is true

2.

Assertion	Carbon dioxide is exhaled from lungs.
Reason	It forms when cells break down food.

Both assertion and reason are true, and the reason is the correct explanation
Both assertion and reason are true, but the reason is not the correct explanation
The assertion is true, but the reason is false
The assertion is false, but the reason is true

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