The signals for parturition originate from from Biology Human Reproduction Class 12 Nagaland Board
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Class 10 Class 12

The signals for parturition originate from

  • placenta only

  • placenta as well as the fully developed foetus

  • oxytocin released from the maternal pituitary

  • the fully developed foetus only


B.

placenta as well as the fully developed foetus

The process of giving birth to a baby is called parturition. Parturition is induced by a complex neuroendocrine mechanism. The signal for parturition originates from the fully developed foetus and the placenta, which induce mild uterine contractions called foetal ejection reflex.

The process of giving birth to a baby is called parturition. Parturition is induced by a complex neuroendocrine mechanism. The signal for parturition originates from the fully developed foetus and the placenta, which induce mild uterine contractions called foetal ejection reflex.

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

B.

Tapeworm
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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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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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