Assertion : During fertilization,only the head of the spermatozoa enters the egg.
Reason : If several spermatozoa hit the egg at the same time,all can enter the egg.

  • A
    If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
  • B
    If both Assertion and Reason are correct but the Reason is not a correct explanation of the Assertion.
  • C
    If the Assertion is correct but the Reason is incorrect.
  • D
    If both the Assertion and Reason are incorrect.

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What is the typical survival time of sperms after being introduced into the female reproductive tract?

Statement-$I$: The trophoblast layer gets attached to the endometrium and the inner cell mass gets differentiated as the embryo.
Statement-$II$: The morula becomes embedded in the endometrium of the uterus.

In humans,fertilization is possible only when,

In vivo fertilisation involves the fertilisation that takes place:

Identify the part labeled as $a$ in the given figure.

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