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NEET 2019 · BiologyPrevious Year Question

Extrusion of second polar body from egg nucleus occurs :

Answer: (A) after entry of sperm but before fertilization. Answer: (A) after entry of sperm but before fertilization Solution: NCERT states that entry of the sperm through the zona pellucida and plasma membrane induces completion of the meiotic division of the secondary oocyte, forming the second polar body and a haploid ovum, after which the sperm and ovum nuclei fuse to form the zygote.

  1. A.after entry of sperm but before fertilization✓
  2. B.after fertilization
  3. C.before entry of sperm into ovum
  4. D.simultaneously with first cleavage

Correct Answer

(A) after entry of sperm but before fertilization

Solution & Explanation

Answer: (A) after entry of sperm but before fertilization Solution: NCERT states that entry of the sperm through the zona pellucida and plasma membrane induces completion of the meiotic division of the secondary oocyte, forming the second polar body and a haploid ovum, after which the sperm and ovum nuclei fuse to form the zygote. Hence the second polar body is extruded after sperm entry but before the fusion (fertilisation) is completed. NCERT Reference: Ch 2, p.36, line 4 — "membrane. This induces the completion of the meiotic division of the"

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