In human female the blastocyst

  • [AIPMT 2010]
  • A

    forms placenta even before implantation

  • B

    gets implanted into uterus 3 days after ovulation

  • C

    gets nutrition from uterine endometrial secretion only after implantation

  • D

    gets implanted in endometrium by the trophoblast cells.

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In our society women are blamed for producing female children. Choose the correct answer for the sex­determination in humans.

  • [NEET 2013]

Which one of the following statements about human sperm is correct?

  • [AIPMT 2010]