Question

Due to the presence of a large amount of yolk, the zygote divides into two incomplete halves. This type of cleavage does not occur in

• A. Peacock, Duck-billed Platypus and Crocodile
• B. Jungle Fowl, Dove and Duck
• C. Hemidactylus, Calotes and Varanus
• D. Amphioxus, Salamander and Rana

Answer 1

The correct option is D Amphioxus, Salamander and Rana

• The cells with a large amount of yolk are known as the macrolecithal eggs.
• They have an incomplete cleavage because of more the amount of yolk, harder it is to divide the cell.
  
• Reptiles and birds usually have the macrolecithal egg.
  

• In amphibians, the yolk is less so the cleavage is complete which is also known as holoblastic cleavage.
  
• Amphioxus is a member of the Cephalochordata group and it also has holoblastic, complete cleavage.
  

So, the correct option is 'Amphioxus, Salamander and Rana'.