Question

Give details of the two different ways in which a zygote develops in the case of animals where fertilization in internal

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Answer 1

Answer:

Two different ways in which a zygote develops in case of animals where fertilization is internal are :

1. Internal fertilization in earthworm: An earthworm , though a hermaphrodite, does not fertilize itself. Two earthworms come in contact with each other and exchange sperms. The eggs are fertilized internally with the sperms received from the partners. Thus, a zygote is developed.

2. Internal fertilization in human: In human fertilization takes place on meeting of male and female gamete inside body. Fertilization is internal, and the development of the zygote into a fully formed individual also occurs inside the  body of the female.

Answer 2

Answer:

Animals that show internal fertilization can develop through viviparous or oviparous processes. Oviparous animals lay eggs which develop into young ones. Viviparous animals, on the other hand, give birth to young ones. Examples of oviparous and viviparous organisms are snakes and dogs, respectively