At which stage of development is ovum released from ovaries?
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Primary oocyte
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Secondary oocyte
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Tertiary oocyte
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Zygote
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Quaternary stage
B
Correct answer
Explanation
The tertiary follicle changes into the mature follicle or Graafian follicle. The secondary oocyte forms a new membrane called zona pellucida surrounding it. The Graafian follicle now ruptures to release the secondary oocyte (ovum) from the ovary by the process called ovulation.