Question

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

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is D Both Assertion and Reason are incorrect

The holoblastic type of cleavage is commonly seen in eggs containing moderate to sparse amount of yolk. Centrolecithal describes the placement of the yolk in the centre of the cytoplasm of ova. Many arthropod eggs are centrolecithal.

So the correct option is ' If both A and R are false'.