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Standard IX

Biology

Pisces

Assertion :In...

Question

Assertion :In fishes, two-chambered heart is found . Reason: Only veins are present in fish.

Both assertion and reason are correct and the reason is the correct explanation for assertion.

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Both assertion and reason are correct but the reason is not the correct explanation for assertion.

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Assertion is correct but the reason is incorrect.

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Assertion is incorrect the reason is correct.

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Solution

The correct option is C Assertion is correct but the reason is incorrect.
A fish's heart is called a 'venous heart' because the heart receives blood from veins and sends it to the gills for oxygenation. The heart is two-chambered and performs single circulation where it receives and pumps only deoxygenated blood. There are veins as well as arteries in the fish. Thus, the correct answer is option C.

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Assertion (A) All collision of reactant molecules lead to product formation.

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(a) Both assertion and reason are correct and the reason is correct explanation of assertion
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(c) Assertion is correct, but reason is incorrect
(d) Both assertion and reason are incorrect
(e) Assertion is incorrect but reason is correct.

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