Question

The egg found in monotremata is

• A. Microlecithal
• B. Mesolecithal
• C. Macrolecithal
• D. None of the above

Answer 1

The correct option is C Macrolecithal

On the basis of the amount of yolk present with respect to the cytoplasm in the ovum, eggs are divided into 3 categories:

Microlecithal egg: Having less amount of yolk than the cytoplasm.

Isolecithal egg: Same amount of yolk as cytoplasm.

Macrolecithal egg: The amount of yolk is much more than cytoplasm. Macrolecithal eggs are present in teleost fishes, gymnophiona, reptiles, birds and monotremates (egg laying mammals like marsupials). Thus, the correct answer is 'Macrolecithal.'