Question
Differentiate between external fertilisation and internal fertilisation with an example for each.
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Answer
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External fertilisation
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Internal fertilisation
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When fusion of gametes (syngamy) occurs outside the body of the organism, it is called external fertilisation.
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When fusion of gametes (syngamy) occurs inside the body of the organism, it is called internal fertilisation.
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A large number of gametes are released in the surrounding medium by such animals.
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The number of ova produced is less, but a large number of male gametes are formed, as they have to travel towards the ovum.
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Chances of survival of offspring are less. e.g. frog and bonyfish.
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Chances of survival of offspring are high. e.g, birds, human beings, etc.
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