Class 12 Biology MCQs Chapter – 1
41. The chromosome number is haploid in :
( A ) zygote
( B ) gametes
( C ) embryo
( D ) seed
Answer-( B )
42. In Angiosperms , how many male gametes are formed in pollen tube
( A ) one
( B ) two
( C ) three
( D ) infinite
Answer-( B )
43. The term dioecious is used t describe :
( A ) bisexual condition
( B ) unisexual condition
( C ) hermaphrodite condition
( D ) gynandromorph
Answer-( B )
44. Double fertilization is found in :
( A ) angiosperms
( B ) gymnosperms
( C ) pteridophytes
( D ) bryophytes
Answer-( A )
45. In plants , meiosis occurs in :
( A ) root tip
( B ) pollen grain
( C ) stem tip
( D ) anther
Answer-( D )
46 .Seeds are called products of sexual reproduction because they :
( A ) are formed by fusion of gametes
( B ) give rise to new plants
( c ) can be stored for long time
( D ) are formed by fusion of pollen tubes
Answer-( A )
47. Bamboo species flower :
( A ) only once in lifetime
( B ) lonce in 12 years
( C ) every year
( D ) twice in 50-100 yrs
Answer-( A )
48. Chromosome number in meiocyte Drosophila ( fruit fly ) is
( A ) 2
( B ) 4
( C ) 6
( D ) 8
Answer-( D )
49. Life span of crocodile and may fly is respectively :
( A ) 15 years , 1 week
( B ) 30 years , 1 week
( C ) 45 years , 1 month
( D ) 60 years , 1 day
Answer-( D )
50. The nodes are called ” eyes ‘ which will form a new plant in :
( A ) Ginger
( B ) Bryophyllum
( c ) Alocasia
( D ) Potato
Answer-( D )
51. Ciliate motile spores are called :
( A ) aplanospores
( B ) conidia
( C ) zoospores
( D ) ospores
Answer-( C )
52. Where two gametes are similar in appearance , they are called :
( A ) Isogametes
( B ) Heterogametes
( C ) Anisogametes
( D ) Exogamy
Answer-( A )
53. Chromosome number in meiocyte of human beings is :
( A ) 40
( B ) 42
( C ) 44
( D ) 46
Answer-( D )
54. Sexual reproduction is responsible for :
( A ) restoring diploid condition
( B ) creation of identical young ones
( C ) no any role in evolution
( D ) restoring haploid condition
Answer-( A )
55. Amphimixis is :
( A ) reaction of antifertilizin and fertilizin
( B ) fusion of male and female pronuclei
( C ) formation of reception cone by ovum
( D ) penetration of sperm into ovum
Answer-( B )
56. Sporogenesis is :
( A ) development and formation of spores
( B ) production of mitospores
( C ) production of meiospores
( D ) formation of zygote and embryo
Answer-( A )
57. Which is diploid structure ?
( A ) Pollen grains
( B ) Egg
( c ) Megaspore
( D ) MMC
Answer-( D )
58. Vegetative propagation occurs in Mint through :
( A ) Suckers
( B ) Runners
( C ) offsets
( D ) Rhizome
Answer-( A )
59. Maximum life span of Dog is :
( A ) 20 years
( B ) 15 years
( C ) 10 years
( D ) 5 years
Answer-( A )
60. Scion is grafted on stalk . Quality of fruits produced will depend upon genotype of :
( A ) Scion
( B ) Stalk
( C ) Both A and B
( D ) None of the above
Answer-( A )
