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Introduction

Assertion :Re...

Question

Assertion :Respiration in Amphioxus is done by both Water and blood. Reason: Amphioxus is aquatic and possesses blood

A

If both the assertion and the reason are true and the reason is a correct explanation of the assertion

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B

If both the assertion and reason are true but the reason is not a correct explanation of the assertion

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C

If the assertion is true but the reason is false

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D

If assertion is false and reason is true

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Solution

The correct option is D If assertion is false and reason is true
In Amphioxus, some exchange of $C O_{2}$ and $O_{2}$ occurs between the water current and blood through the gill clefts, most of the times the gill slits are used for exchange of food rather than gases
The blood in these organisms flows very close to the skin such that the exchange of gases occurs through the entire body surface
So, the correct answer is D 'assertion is false but reason is true'

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