In the following questions, Statement of assertion (A) is followed by a statement of reason (R). 1. If both assertion and reason are true and the reason is the correct explanation of the assertion, then mark. 2. If both assertion and reason are true but the reason is not the correct explanation of the assertion, then mark. 3. If assertion is true statement but reason is false, then mark. 4. If both assertion and reason are false statements then mark.
Assertion: Holoblastic cleavage with almost equal sized blastomeres is a characteristic of placental animals. Reason: Eggs of most mammals, including human, are of centrolecithal type.A) 1
B) 2
C) 3
D) 4
Correct Answer: C
Solution :
Eggs containing a small amount of yolk or without any yolk are known as micro lecithal/alecithal/oligolecithal/meiolecithal eggs. Such eggs are found in starfish, Amphioxus, eutherian mammals including rabbit and human beings. In such egg equal holoblastic cleavage takes place in which equal or approximately equal sized blastomeres are produce.
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