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Question
Hens and frogs are both oviparous exhibiting different types of fertilisation. Explain.
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Solution
Hens are oviparous in which internal fertilisation takes place. The fertilised egg divides repeatedly to form an embryo inside the body. The embryo however, travels down the oviduct with many protective layers forming around it. After the hard eggshell is formed around the developing embryo, the hen lays the eggs outside. After about 3 weeks, the development of a chick from an egg takes place.
On the contrary, frogs are oviparous in which external fertilisation occurs. The frogs lay eggs and sperm in water, which come in contact to undergo fertilisation. In this way, a female frog’s eggs get fertilised by sperm outside its body, i.e., external fertilisation.
The fertilised eggs are covered by a jelly for protection. The development of embryo takes place in the egg in water, i.e., they are oviparous.
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