Class 12 topic wise Online MCQ with answers
Class 12 topic wise Online MCQ with answers
2. Reproduction in lower and higher animals
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1. Capacitation occurs in………………
(a) epididymis
(b)
vas deferens
(c) female reproductive tract
(d)
rete testis.
Answers
2. About
which day in a normal human menstrual cycle does rapid secretion of LH
(popularly called LH surge) normally occurs?
(a) 14 th day
(b) 20 th day
(c) 5 th day
(d)
11 th day
Answers (a) 14 th day
3. Sertoli cells are found in………………
(A)Ovaries
and secrete progesterone
(B)Adrenal
cortex and secrete adrenaline
(c)
Seminiferous tubules and provide nutrition to germ cells
(d)
Pancreas and secrete cholecystokinin.
Answers (c) Seminiferous tubules and provide nutrition to germ cells
4. Several hormones like hCG,
hPL, estrogen, progesterone are produced by………….
(a) ovary
(b) placenta
(c) Fallopian tube
(d) pituitary.
Answers (b) placenta
5. Changes in GnRH pulse
frequency in females is controlled by circulating levels of…………
(a) progesterone only
(b)
progesterone and inhibin
(c) estrogen and progesterone
(d)
estrogen and inhibin.
Answers (c) estrogen and progesterone
6. Fertilization in humans is
practically feasible only if…………..
(a) the ovum and sperms are transported simultaneously to
ampullary–isthmic junction of the cervix
(b) the sperms are transported into cervix within 48 hrs of
release of ovum in uterus
(c) the sperms are transported into vagina just after the release
of ovum in Fallopian tube
(d) the ovum and sperms are transported simultaneously to
ampullary–isthmic junction of the Fallopian tube.
Answers
7. Select the incorrect
statement…..
(a) LH and FSH decrease gradually during the follicular phase.
(b) LH triggers secretion of androgens from the Leydig cells.
(c) FSH stimulates the Sertoli cells which help in spermiogenesis.
(d) LH triggers ovulation in ovary.
Answers
8. Identify the correct
statement on ‘inhibin’.
(a) Is produced by granulosa cells in ovary and inhibits the
secretion of LH
(b) Is produced by nurse cells in testes and inhibits the
secretion of LH
(c) Inhibits the secretion of LH, FSH and prolactin
(d) Is produced by granulosa cells in ovary and inhibits the
secretion of FSH
Answers
9. In human females, Meiosis II
is not completed until…………..
(a) uterine implantation
(b)
birth
(c) puberty
(d) fertilisation.
Answers
10. Which of the following
layers in an antral follicle is acellular?
(a) Stroma
(b) Zona pellucida
(c) Granulosa
(d) Theca interna
Answers
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11. Which of the following
events is not associated with ovulation in human female?
(a) Release of secondary oocyte
(b)
LH surge
(c) Decrease in estradiol
(d)
Full development of Graafian follicle
Answers
12. Ectopic pregnancies are
referred to as……………
(a) implantation of defective embryo in the uterus
(b) pregnancies terminated due to hormonal imbalance
(c) pregnancies with genetic abnormality
(d) implantation of embryo at site other than uterus.
Answers
13. Which of the following
cells during gametogenesis is normally diploid ?
(a) Spermatogonia
(b)
Secondary polar body
(c) Primary polar body
(d)
Spermatid
Answers
14. Capacitation refers to
changes in the…………….
(a) ovum after fertilization
(b)
sperm after fertilization
(c) sperm before fertilization
(d)
ovum before fertilization.
Answers
15. Hysterectomy is surgical
removal of
(a) vas deferens
(b) mammary glands
(c) uterus
(d) prostate
gland.
Answers
16. Which of these is not an
important component of initiation of parturition in humans?
(a) Release of oxytocin
(b)
Release of prolactin
(c) Increase in estrogen and progesterone ratio
(d) Synthesis of prostaglandins
Answers
17. The shared terminal duct
of the reproductive and urinary system in the human male is………
(a) urethra
(b) ureter
(c) vas deferens
(d) vasa efferent.
Answers
18. The main function of
mammalian corpus luteum is to produce
(a) estrogen only
(b)
progesterone
(c) human chorionic gonadotropin
(d)
relaxing only.
Answers
19. Select the correct option
des cribbing gonadotropin activity in a normal pregnant female.
(a) High level of FSH and LH stimulates the thickening of
endometrium.
(b) High level of FSH and LH facilitates implantation of the
embryo.
(c) High level of hCG stimulates the synthesis of estrogen and
progesterone.
(d) High level of hCG stimulates the thickening of endometrium.
Answers
20. What is the correct
sequence of s perm formation?
(a) Spermatogonia, spermatozoa, spermatocytes, spermatids
(b) Spermatogonia,spermatocytes, spermatids, spermatozoa
(c) Spermatids, spermatocytes, spermatogonia, spermatozoa
(d) Spermatogonia, spermatocytes, spermatozoa, spermatids (NEET
2013)
Answers
21. Which one of the following
is not the function of placenta?
(a) Facilitates removal of carbon dioxide and waste material from
embryo
(b) Secretes oxytocin during parturition
(c) Facilitates supply of oxygen and nutrients to embryo
(d) Secretes estrogen
Answers
22. Menstrual flow occurs due
to lack of……………
(a) oxytocin
(b) vasopressin
(c) progesterone
(d)
FSH.
Answers c) progesterone
23. Which one of the following
statements is false in respect of viability of mammalian sperm?
(a) Sperm is viable for only up to 24 hours.
(b) Survival of sperm depends on the pH of the medium and is more
active in alkaline medium.
(c) Viability of sperm is determined by its motility.
(d) Sperms must be concentrated in a thick suspension.
Answers
24. In our society women are
blamed for producing female children. Choose the correct answer for the sex
determination in humans.
(a) Due to some defect like aspermia in man
(b) Due to the genetic make up of the particular sperm which fertilizes the egg
(c) Due to the genetic make up of the egg
(d) Due to some defect in the women
Answers (b) Due to the genetic make up of the particular sperm which fertilizes the egg
25. The foetal ejection reflex
in humans triggers the release of………..
(a) oxytocin from foetal pituitary
(b)
human chorionic gonadotropin (hCG) from placenta
(c) human placental lactogen (hPL) from placenta
(d) oxytocin from maternal pituitary.
Answers d) oxytocin from maternal pituitary.
26. Which one of the
following statements is false in respect of viability of mammalian sperm?
(a)
Sperm is viable for only up to 24 hours.
(b)
Survival of sperm depends on the pH of the medium and is more active in
alkaline medium.
(c)
Viability of sperm is
determined by its motility.
(d)
Sperms must be concentrated in a thick suspension.
Answers
27.
Signals for parturition originate from
(a)
both placenta as well as fully developed
foetus
(b)
oxytocin released from maternal pituitary
(c)
placenta only
(d) fully
developed foetus only
Answers
28. In a
normal pregnant woman, the amount of
total gonadotropin activity was assessed. The
result expected was
(a)
high level
of circulating FSH and LH in
the uterus to stimulate implantation of the
embryo
(b)
high level of circulating hCG to stimulate
endometrial thickening
(c)
high levels of FSH and LH in uterus to
stimulate endometrial thickening
(d)
high level of circulating hCG to stimulate
estrogen and progesterone synthesis.
Answers
29.
The Leydig’s cells as found in the human body
are the secretory source of
(a)
progesterone
(b)
intestinal mucus
(c)
glucagon
(d)
androgens.
Answers
30.The secretory
phase in the human menstrual
cycle is also called
(a)
luteal phase and lasts for about 6 days
(b)
follicular phase and lasts for about 6 days
(c)
luteal phase and lasts for about 13 days
(d)
follicular phase and lasts for about
13 days.
Answers (c) luteal phase and lasts for about 13 days
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