CBSE Class 12 Biology Human Reproduction MCQs Set B

Question: Sex of a human baby is determined by the
(a) Father
(b) Mother
(c) Any one of them
(d) Is independent of father and mother

Answer : A

Question: Placenta is formed by the interdigitation of
(a) Chorionic villi with trophoblast
(b) Chorionic villi with fallopian tube wall
(c) Chorionic villi with uterine wall
(d) Chorionic villi with inner cell mass

Answer : C

Question: The gestation period for human pregnancy is
(a) 36 weeks
(b) 30 weeks
(c) 9 months
(d) Both (a) and (c)

Answer : D

Question: After ovulation Graafian follicle regresses into
(a) corpus artesia
(b) corpus callosum
(c) corpus luteum
(d) corpus albicans.

Answer : C

Question: The main function of mammalian corpus luteum is to produce
(a) estrogen only
(b) progesterone
(c) human chorionic gonadotropin
(d) relaxin only.

Answer : B

Question: The first movements of the fetus and appearance of hair on its head are usually observed during which month of pregnancy?
(a) Fourth month
(b) Fifth month
(c) Sixth month
(d) Third month

Answer : B

Question: In human females, meiosis-II is not completed until
(a) uterine implantation
(b) birth
(c) puberty
(d) fertilisation.

Answer : D

Question: 1st polar body is formed at which stage of oogenesis ?
(a) 1st meiosis
(b) 2nd mitosis
(c) 1st mitosis
(d) Differentiation

Answer : A

Question: All of the following statements concerning pregnancy are accurate EXCEPT
(a) the detection of human chorionic gonadotropin in the urine forms the basis for pregnancy tests.
(b) the cyclic release of pituitary gonadotropins and ovarian steroids is continued.
(c) the mammary gland tissue of the pregnant woman is stimulated to develop by placental hormones.
(d) the corpus luteum of pregnancy maintains the uterus until the placenta is well established.

Answer : B

Question: Withdrawal of which of the following hormones is the immediate cause of menstruation?
(a) Progesterone
(b) Estrogen
(c) FSH
(d) FSH-RH

Answer : A

Question: In an egg, the type of cleavage is determined by
(a) the amount and distribution of yolk
(b) the number of egg membranes
(c) the shape and size of the sperm
(d) the size and location of the nucleus.

Answer : C

Question: The mill produced by the mother during the initial few days is called
(a) Perimetrium
(b) Colostrum
(c) Lactose milk
(d) None of these

Answer : D

Question: Finger like projection that appear on trophoblast after implai are known as
(a) Isthmus
(b) Chorionic
(c) Chorionic villi
(d) Inner cell mass

Answer : C

Question: The fetal ejection reflex in humans triggers the release of
(a) oxytocin from fetal pituitary
(b) human chorionic gonadotropin (hCG) from placenta
(c) human placental lactogen (hPL) from placenta
(d) oxytocin from maternal pituitary.

Answer : D

Question: 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.

Answer : C

Question: A human female reaches menopause aroung the age of
(a) 50 years
(b) 15 years
(c) 70 years
(d) 25 years.

Answer : A

Question: The shared terminal duct of the reproductive and urinary system in the human male is
(a) urethra
(b) ureter
(c) vas deferens
(d) vasa efferentia.

Answer : A

Question: Which of the following hormone is not pregnancy time specific?
(a) Human chorionic gonadotropin
(b) Human placental lactogen
(c) Estrogen and progesterone
(d) Relaxin

Answer : C

Question: In spermatogenesis, reduction division of chromosome occurs during conversion of
(a) spermatogonia to primary spermatocytes
(b) primary spermatocytes to secondary spermatocytes
(c) secondary spermatocytes to spermatids
(d) spermatids to sperms.

Answer : B

Question: Hormones secreted by the placenta to maintain pregnancy are
(a) hCG, hPL, progestogens, prolactin
(b) hCG, hPL, estrogens, relaxin, oxytocin
(c) hCG, hPL, progestogens, estrogens
(d) hCG, progestogens, estrogens, glucocorticoids.

Answer : C

Question: Meroblastic cleavage is a division which is
(a) horizontal
(b) partial/parietal
(c) total
(d) spiral.

Answer : B

Question: Parturition is a process having
(a) Neural control
(b) Endocrine control
(c) Muscular control
(d) Both (a) and (b)

Answer : A

Question: The zygote after fertilisation moves towards
(a) Ampulla
(b) Ovary
(c) Infundibulum
(d) Uterus

Answer : D

Question: Seminal plasma in humans is rich in
(a) fructose and calcium but has no enzymes
(b) glucose and certain enzymes but has no calcium
(c) fructose and certain enzymes but poor in calcium
(d) fructose, calcium and certain enzymes.

Answer : D

Question: Women who consumed the drug thalidomide for relief from vomiting during early months of pregnancy gave birth to children with
(a) no spleen
(b) hare-lip
(c) extra fingers and toes
(d) under developed limbs

Answer : D

Question: Embryo is formed by differentiation of which of cell
(a) Trophoblast
(b) Inner cell mass of blastocyst
(c) Morula inner layer
(d) None of these

Answer : B

Question: The membranous cover of the ovum at ovulation is
(a) corona radiate
(b) zona radiata
(c) zona pellucida
(d) chorion.

Answer : A

Question: Limbs and digits of foetus are formed after how many month of pregnancy
(a) One month
(b) Two months
(c) Three months
(d) Seven months

Answer : B

Question: The first movement and hair appear after
(a) One month
(b) Two months
(c) Three months
(d) Five months

Answer : D

Question: Spot the odd one out from the following structures with reference to the male reproductive system.
(a) Rate testis
(b) Epididymis
(c) Vasa efferentia
(d) Isthmus

Answer : D