Haploid egg is fertilized by sperm at which stage?

Primary oocyte

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Secondary oocyte

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Oogonium

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Ovum

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Solution

The correct option is B Secondary oocyte
The primary oocyte undergoes meiosis I in response to hormonal stimulation and produces small a large secondary oocyte and a small polar body. The secondary oocyte then undergoes meiosis II and remains arrested at metaphase II. This secondary oocyte will be completely matured after fertilization by the sperm. Thus, the correct option is B.

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