STPM Biology - chapter 13: Revision essay question 1

1. By giving suitable examples, explain briefly what is meant by the terms, oviparity, ovoviviparity and viviparity.   [6]

Answer:


oviparity

1. Definition: eggs are laid and hatched outside the female body
    Example: reptiles, birds, frogs, most fish, insects, some species of sharks




ovoviviparity:

Definition: the egg is fertilized and stored in the oviduct. embryo is nourished by the yolk in the egg and the young are born after being hatched within the mother's body.

Example: some species of sharks





viviparity:

Definition: the egg is fertilized within the female body and the embryo formed is nourished by nutrients obtained from the mother's body through placenta. The baby is born alive.

Example: All mammals and some species of sharks.