In humans, at the end of the first meiotic division, the male germ cells differentiate into the from Biology Human Reproduction Class 12 Nagaland Board
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In humans, at the end of the first meiotic division, the male germ cells differentiate into the

  • Primary spermatocytes

  • Secondary spermatocytes

  • spermatids

  • spermatogonia


B.

Secondary spermatocytes

At sexual maturity, the germ cells in human male divide several times by mitosis to produce a large number of spermatogonia. In the growth phase, each spermatogonium actively grows to a larger primary spermatocyte by obtaining nourishment from the nursing cells. In maturation phase, each primary spermatocyte undergoes two successive division called maturation divisions. The primary spermatocyte undergoes first maturation division (meiotic) to producing tow haploid daughter cells called secondary spermatocytes undergo second maturation division to form four haploid spermatids. The transformation of spermatids into spermatozoa is called spermiogenesis or spermateliosis.

At sexual maturity, the germ cells in human male divide several times by mitosis to produce a large number of spermatogonia. In the growth phase, each spermatogonium actively grows to a larger primary spermatocyte by obtaining nourishment from the nursing cells. In maturation phase, each primary spermatocyte undergoes two successive division called maturation divisions. The primary spermatocyte undergoes first maturation division (meiotic) to producing tow haploid daughter cells called secondary spermatocytes undergo second maturation division to form four haploid spermatids. The transformation of spermatids into spermatozoa is called spermiogenesis or spermateliosis.

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

B.

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

D.

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

C.

spermiogenesis
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