The correct sequence of spermatogenetic stages leading to the formation of sperms in mature human testis is from Biology Human Reproduction Class 12 Nagaland Board
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The correct sequence of spermatogenetic stages leading to the formation of sperms in mature human testis is

  • spermatocyte-spermatoogonia-spermatid-sperms

  • spermatogonia-spermatocyte-spermatid

  • spermatid-spermatocyte-spermatogonia-sperms,

  • spermatogonia-spermatid-spermatocyte-sperms


B.

spermatogonia-spermatocyte-spermatid

In spermatogenesis, during growth phase some spermatogonia either due to growth or due to food storage become 2 or 3 times larger to their original size and are known as primary spermatocytes, which undergo meiosis- I and as result2 haploid secondary spermatocytes are formed.Further, meiosis-II takes place that results in the formation of 4- spermatids. Then, these round, non-motile and haploid spermatids are transformed into thread-like motile, haploid sperms (four).

In spermatogenesis, during growth phase some spermatogonia either due to growth or due to food storage become 2 or 3 times larger to their original size and are known as primary spermatocytes, which undergo meiosis- I and as result2 haploid secondary spermatocytes are formed.Further, meiosis-II takes place that results in the formation of 4- spermatids. Then, these round, non-motile and haploid spermatids are transformed into thread-like motile, haploid sperms (four).

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The chromosone in primary spermatocyte are :
  •  22 + X 
  • 22+Y
  • 44 + XX
  • 44 + XY

D.

44 + XY
987 Views

The process of differentiation of spermatid into a spermatozoa is known as :
  • spermatogenesis
  • gametogenesis
  • spermiogenesis
  • oogenesis

C.

spermiogenesis
1502 Views

Which of the following shows hermaphroditism and self fertilization ?
  • Earthworm
  • Tapeworm
  • Both A & B
  • Rotifers.

B.

Tapeworm
976 Views

Ovulation takes place :
  • 2 weeks before the start of next menstrual cycle
  • 14th day of 28 days cycle
  • 10 days after the cease of previous monthly cycle
  •  All the above are correct.

B.

14th day of 28 days cycle
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Primary spermatocyte produces 4 spermatozoa, but primary oocyte produces :
  • 1 ovum
  • 2 ova
  • 3 ova
  • 4 ova

A.

1 ovum
1111 Views