Multiple choice

Grey crescent is the area

  1. at the point of entry of sperm into ovum.

  2. just opposite to the site of entry of sperm into ovum.

  3. at the animal pole.

  4. at the vegetal pole.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

  Grey crescent is the area just opposite to the site of entry of sperm into ovum.Its establishment determines the location of the dorsal and ventral (up-down) axis, as well as of the anterior and posterior (front-back) axis and the dextro-sinistral (left-right) axis of the embryo.

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