Question

Choose the correct combination.

• A. Oviparous animals ➤ External fertilisation ➤ Placental connection ➤ Elephants
• B. Ovoviviparous animals ➤ Internal fertilisation ➤ Aplacental viviparity ➤Basking shark.
• C. Viviparous animal ➤ Internal fertilisation ➤ Placental connection ➤ Platypus
• D. Ovoviviparous animals ➤ Internal fertilisation ➤ Placental connection ➤Basking shark.

Answer 1

The correct option is B Ovoviviparous animals ➤ Internal fertilisation ➤ Aplacental viviparity ➤Basking shark.

1. Females in viviparous animals, such as majority of mammals, give birth to young ones. They exhibit internal fertilisation, placental nourishment and a higher chance of survival of offspring. Platypus is an exceptional mammal that lay eggs or is oviparous.
2. Females in oviparous animals such as reptiles and birds lay eggs with protective, hard calcareous shell covering, Fertilisation is internal with no placental connection between the embryo and the mother. Survival rates of offspring are lower than that of viviaprous animals.
3. Females in ovoviviparous animals such as basking sharks and rattle snakes retain the egg inside the body. Eggs hatch inside the body and the mother give birth to young ones. There is no special nourishment by placental nourishment as the young one develops inside the egg.