Download App

STD 12 - 2. human reproduction — Biology STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceBiologySTD 12 - 2. human reproduction1 Mark
MCQ
Foetal ejection reflex in human female is induced by
  • A
    release of oxytocin from pituitary
  • ✓
    fully developed foetus and placenta
  • C
    differentiation of mammary glands
  • D
    pressure exerted by amniotic fluid.
✓

Answer

Correct option: B.
fully developed foetus and placenta
b
(b) : Parturition is induced by a complex neuroendocrine mechanism. The signals for parturition originate from the fully developed foetus and the placenta which induce mild uterine contractions called foetal ejection reflex. This triggers release of oxytocin from the maternal pituitary. Oxytocin acts on the uterine muscle and causes stronger uterine contractions, which in turn stimulates further secretion of oxytocin. The stimulatory reflex between the uterine contraction and oxytocin secretion continues resulting in stronger and stronger contractions. This lead to expulsion of the baby out of the uterus through the birth canal.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from STD 12 - 2. human reproduction→STD 12 - 2. human reproduction — all question types→Biology STD 12 Science question papers→CBSE Board STD 12 Science question papers→CBSE Board question paper generator→

Similar questions

Which of the following statement is/are correct about diaphragms, cervical caps and vaults?

$A.$ Barrier methods of contraception

$B.$ Cover the cervix during coitus

$C.$ Protect the user from contracting $STDs$

$D.$ They are reusable
 

→
In some viruses$, \text{DNA}$ is synthesised by using $\text{RNA}$ as template. Such a $\text{DNA}$ is called:
→
Rajaji national park is situated in:
→
One of the most resistant biological material is.
→
Which of the following ecological pyramids is generally inverted ?
→
The branch of botany dealing with heredity and variation is called
→
Thorn of Bougainvillea and tendril of Cucurbita are examples of
→
Between which among the following, the relationship is not an example of commensalism?
→
Natural parthenogenesis occurs in:
→
Biodiversity describes the study of diversity:
→