Class 12 Biology MCQs Chapter – 2
21.. After fertilization, seed coats of seed develop from :
(A) embryo sac
(B) integuments
(C) ovule
(D) chalazal region
Ans – (B)
22. One of the following essential for fertilization is :
(A) Corolla
(B) Mature ovule
(C) Calyx
(D) Fruit
Ans – (B)
23. At the time the pollen tube contains :
(A) two male gametes
(B) two male nuclei
(C) four male gametes
(D) three male gametes
Ans – (A)
24. Double fertilization is the fusion of:
(A) one egg with two sperms
(B) sperm nucleus with egg nucleus as well as with polar nuclei
(C) one male gamete with egg and other male gamete with synergid
(D) one male gamete with egg and other male gamete with secondary nucleus.
Ans – (D)
25. Double fertilization is characteristic of :
(A) dicots and monoctos/all angiosperms
(B) all Gymnosperms
(C) phanerogams
(D) Spermatophytes
Ans – (A)
26. Triple fusion is :
(A) fusion of one male gamete with two polar nuclei in the embryo sac
(B )fusion of one male gamete with three nuclei in embryo sac
(C) fusion of one male gamete with two synergids
(D )three fusions in one embryo sac
Ans – (A)
27. Amphibians among plants belong to
(A) Algae
(B) Bryophytes
(C) Fungi
(D) Pteridophytes
Ans – (B)
28. Gynoecium is made up of
(A) Stigma
(B) Style
(C) Ovary
(D) All of above
Ans – (D)
29. The monohybrid genotypic ratio 1 2: 1 in F2 generation indicates :
(A) Segregation
(B) Independent assortment
(C) Dominance
(D) Incomplete dominance
Ans – (A)
30. In a fully developed male gametophyte the number of nuclei is :
(A) one
(B) five
(C) three
(D) four
Ans – (C)
31. If an endosperm cell of an angiosperm contains 24 chromosomes, the number of chromosomes in each cell of the root will be
(A) 8
(B) 4
(C) 16
(D) 24
Ans – (C)
32. The female gametophyte of a typical dicot at the time of fertilization is
(A) 8-celled
(B) 7-celled
(C) 6-celled
(D) 5-celled
Ans – (B)
33. Feathery stigma occurs in
(A) Pea
(B) Wheat
(C) Datura
(D) Caesalpinia
Ans – (D)
34. How many meiotic divisions are required for the formation of 100 functional megaspores ?
(A) 100
(B) 50
(C) 25
(D) 26
Ans – (A)
35. How many meiotic divisions are required for the formation of 100 pollen grains ?
(A) 100
(B) 50
(C) 25
(D) 26
Ans – (C)
36 Pollen grains are
(A) megaspore
(B ) microspore
(C) microsporophyll
(D) microsporangium
Ans – (B)
37. The total number of nuclei involved in double fertilization in angiosperms are :
(A) two
(B) three
(C) four
(D) five
Ans – (D)
38. In which of the following species of plants seeds are produced through Apomixis ?
(A) Asteraceae and grass
(B) Mustard
(C) Citrus and Mango
(D)None of these
Ans – (A)
39. Pollination is the characteristic of
(A) Bryophytes and Angiosperms
(B) Peteridophytes and Angiosperms
(C) Angiosperms and Gymnosperms
(D) Angiosperms and Fungi
Ans – (C)
40. Progeny produced as a result of cross pollination :
(A) Shows high degree of variability and is evolutionary important
(B) is sterile
(C) has recessive characters
(D) is homozygous with phenotypic uniformity
Ans – (A)
