To ensure the effectiveness of reproduction in mammals,which of the following is essential?

  • A
    Formation of yolk sac
  • B
    Retention of yolk sac
  • C
    Reduced number of eggs
  • D
    Formation of placenta

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Fertilizin is secreted by which of the following?

Identify the structure shown in the image (assuming a blastocyst stage with inner cell mass and trophoblast).

Identify the correct option regarding the provided diagram of an ovum during fertilization.

Which one of the following statements is $CORRECT$?

From which part of the ovum does the sperm enter?

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