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Internal fertilisation occurs in BOTH human beings and hens — but humans are viviparous while hens are oviparous. This is because in HENS:
AThere is no zygote stage
BThe egg has a hard shell formed after fertilisation, and the hen lays it; the embryo develops inside the shell, not inside the mother's body
CFertilisation happens outside the body
DThe chicks develop fully inside the mother and then are laid as eggs
Answer & Solution
Correct answer: B. The egg has a hard shell formed after fertilisation, and the hen lays it; the embryo develops inside the shell, not inside the mother's body
In a hen, fertilisation is internal but a hard shell forms around the zygote as it travels down the oviduct, and the hen LAYS the egg. The chick then develops inside the shell during about 3 weeks of incubation. So the same animal can have internal fertilisation AND be oviparous.
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