Q163 / 180 · NEET 2026 (Re-NEET) · Zoology

The covering of ovum at ovulation is __________.

  • A
    chorion
  • B
    endometrium
  • C
    zona radiata
  • Correct answer
    D
    zona pellucida

Solution

At ovulation, the mammalian ovum (in the secondary oocyte stage) is released from the Graafian follicle.

It is surrounded by two main coverings:
1. Zona pellucida: An inner, non-cellular glycoprotein layer secreted by the oocyte.
2. Corona radiata: An outer, cellular layer formed by the follicular cells (granulosa cells).

Hence, the correct answer is option: 'D'.

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