Question

Fill in the blanks:
(b) Humans are (oviparous, viviparous, ovoviviparous)

Answer 1

1: Introduction
There are five classes under phylum chordata - fish, amphibians, reptiles, mammals and birds. Members of these classes that reproduce sexually, either give birth to young ones directly (viviparous) or lay eggs (oviparous) or in some cases the egg hatches within the organism and it gives birth to young one (ovoviviparous).

2: Oviparous
Sexually reproducing organisms that lay eggs and the development of the zygote occurs within the egg. Such organisms are called oviparous. Eg : Birds

3: Viviparous
Sexually reproducing organisms like humans, that give birth to young ones directly. In this case the development of the zygote occurs within the body of the organism. Such organisms are called viviparous.

4: Ovoviviparous
In some sexually reproducing organisms the egg hatches within the organism and gives birth to young ones. Such organisms are called ovoviviparous. Example- sharks