Question

Which mammals have more yolk than cytoplasm in their eggs?

• A. Placental mammals
• B. Echinoderms
• C. Marsupials
• D. Egg laying mammals

Answer 1

The correct option is D Egg laying mammals

Placental mammals (Eutherians) have alecithal eggs which contain negligible amount of yolk.
Marsupials and Echinoderms have microlecithal eggs containing little amount of yolk.
The egg laying mammals have macrolecithal or polylecithal eggs which contains several times more yolk than cytoplasm.
Thus, the correct answer is option D.