Class 12 Biology MCQs Chapter – 3
41. After ovulation Graffian follicle regresses into :
( A ) Corpus atresia
( B ) Corpus callosum
( C ) Corpus luteum
( D ) Corpus albicans
Answer-( C )
42. Seminal plasma in human is rich in
( A ) Fructose and Calcium but no enzymes
( B ) Glucose and certain enzymes but no calcium
( C ) Fructose and certain enzymes but poor in calcium
( D ) Fructose , Calcium & certain enzymes
Answer-( C )
43. The process of release of sperms from sertoli cells into cavity of seminiferous tubules is called :
( A ) Spermiogenesis
( B ) Spermatogenesis
( C ) Spermiation
( D ) None
Answer-( C )
44. Urine test during pregnancy determines the presence of
( A ) hcG
( B ) ostrogen
( C ) Progesterone
( D ) LH
Answer-( A )
45. When released from ovary , human egg contains
( A ) one Y chromosome
( B ) two X chromosome
( C ) one X chromosome
( D ) XY chromosome
Answer-( C )
46. In a sperm the nucleus containing genetic part is situated in :
( A ) Acrosome
( B ) Head
( C ) Middle piece
( D ) Tail
Answer-( B )
47. A sperm without Acrosome can not :
( A ) get food supply
( B ) move
( C ) penetrate into the seminal vesicle
( D ) penetrate into the ovum
Answer-( D )
48. Which is true for cleavage ?
( A ) Size of embryo increases
( B ) Size of cells decreases
( C ) Size of cells increases
( D ) Size of embryo decreases
Answer-( B )
49. Which type of cleavage occurs in the zygote of human female ?
( A ) Holoblastic and equal
( B ) Meroblastic
( C ) Holoblastic and unequal
( D ) Diploblastic
Answer-( A )
50. Which one of the following events is correctly matched with the time period in a normal menstrual cycle ?
( A ) Release of egg : 5th day
( B ) Endometrium regenerates : 5 -10 days
( C ) Endometrium secretes nutrients for implantation : 11-18 days
( D ) Rise in progesteron level : 1-15 days
Answer-( B )
51. Sertoli cells are regulated by the pituitary hormone known as :
( A ) GH
( B ) Prolactin
( C ) LH
( D ) FSH
Answer-( C )
52. Withdrawl of which of the following hormones is the immediate cause of menstruation ?
( A ) FSH
( B ) FSH – RH
( B ) Progesterone
( D ) Estrogen
Answer-( C )
53. Ascial filament of the sperm is formed by :
( A ) proximal centriole
( B ) distal centriole
( C ) mitochondria
( D ) nucleus
Answer-( B )
54. Which type / types of placenta is are found in human beings ?
( A ) chorionic
( B ) haemochorial
( C ) metadiscoidal
( D ) all of the above
Answer-( D )
55. Fertilization does not occur in the absence of :
( A ) Sodium
( B ) Potassium
( C ) Calcium
( D ) Iron
Answer-( C )
56. Colostrum is the first milk which comes from the mammary glands of the mother . Colostrum contains antibody :
( A ) IgA
( B ) IgD
( C ) IgE
( D ) IgG
Answer-( A )
57. Prostaglandins are :
( A ) proteins
( B ) carbohydrates
( C ) lipids
( D ) unsaturated fatty acids
Answer-( D )
58. Fructose produced by seminal vesicles provides forensic test for :
( A ) syphilis
( B ) AIDS
( C ) rape
( D ) hepatitis
Answer-( C )
59. Spermatogenesis is promoted by :
( A ) FSH
( B ) MSH
( C ) ACTH
( D ) hCG
Answer-( A )
60. Spermatogenesis is promoted by :
( A ) 1
( B ) 4
( C) 16
( D ) 32
Answer-( C )
