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NEET2026ZoologyHuman ReproductionActual

The covering of ovum at ovulation is __________.

Options

  1. Achorion
  2. Bendometrium
  3. Czona radiata
  4. Dzona pellucida

Correct answer

D. zona pellucida

Step-by-step 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).

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