If mammalian ovum fails to get fertilised, which one of the following is unlikely?

Corpus luteum will disintegrate

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Oestrogen secretion further decreases

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Primary follicle starts developing

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Progesterone secretion rapidly declines

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Solution

The correct option is D Progesterone secretion rapidly declines
If mammalian ovum fails to get fertilised the corpus luteum degenerate. This causes disintegration of endometrium leading to menstruation and a new cycle starts. Progesterone secretion declines and the primary follicle starts to develop again.

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