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.

Options

A. If the both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true and the reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false statements.

Answer

C

Explanation

In holoblastic cleavage, the cleavage furrows bisect the entire egg, or in other words, entire egg divides by each cleavage furrow. In placental mammals having isolecithal or microlecithal egg, the holoblastic cleavage produces blastomerers of equal or approximately equal size.
Centrolecithal eggs are found in insects and in some gydozoa. Here, yolk is concentrated at the centre of egg and the cytoplasm is present surroundig it. Meroblastic cleavage occurs in them.