Assertion :Holoblastic cleavage with almost equal sized blastomeres is a characteristics feature of placental mammals. Reason: Egg of most mammal including human are of centrolecithal type.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.

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Assertion is correct but Reason is incorrect.

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Both Assertion and Reason are incorrect.

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Solution

The correct option is C Assertion is correct but Reason is incorrect.
Holoblastic cleavage is also known as complete cleavage in which there is formation of equal sized blastomeres and is found in the eggs of placental mammals. Hence assertion is correct.
Eggs of mammals including human are of microlecithal type as they have very less amount of yolk sac in them. Hence reason is incorrect.
So, the correct answer is 'Assertion is correct but Reason is incorrect'.

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Similar questions

Q. Assertion :

Holoblastic cleavage, with almost equal sized blastomeres, is a characteristic of placental mammals.

Reason: Eggs of most mammals, including humans are of centrolecithal type

Q. Assertion :Holoblastic cleavage with almost equal sized blastomeres is a characteristic of placental animals. Reason: Eggs of most mammals, including humans are of centrolecithal type.

Q. Assertion :Holoblastic cleavage with almost equal sized blastomeres in characteristic of placental mammal. Reason: Eggs of most mammals including humans are centrolethial.

Q. Assertion: The compressibility factor for

H_{2}

and

H e

(1 + \frac{P b}{R T})

Reason: The compressibility factor for

H_{2}

and

H e

can be derived from Van der Waal's equation.

Assertion (A) Order of the reaction can be zero or fractional.

Reason (R) We cannot determine order from balanced chemical equation.

(a) Both assertion and reason are correct and the reason is correct explanation of assertion
(b) Both assertion and reason are correct, but reason does not explain assertion.
(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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