In Spermiogenesis.........

  • A

    The middle and tail region of mature sperm are disintegrated.

  • B

    The spermatids are transformed into mature sperm.

  • C

    Spermatids produced from secondary spermatocytes

  • D

    Secondary spermatocytes produced from primary spermatocytes.

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Match the columns.

  Column $I$   Column $II$
$(a)$ Mens pubis $(1)$ Embryo development
$(b)$ Antrum  $(2)$ Sperm cell
$(c)$ Trophoblast layer $(3)$  External genitals offemale
$(d)$  Mitochondria $(4)$  Graafian follicle

When male ejaculates sperms during coitus of which for normal fertility at least....... percent sperms must have normal shape and size and at least ...........per cent of them must show vigorous motility