Class 12 Biology MCQs Chapter – 2
81. How many pollen mother cells will form 1000 pollen grains ?
(A) 200
(B) 250
(C) 300
(D) 100
Ans – (B)
82. The microspore mother cell in a pollensac of arnther is:
(A) diploid
(B) haploid
(C) tripolid
(D) polyptoid
Ans – (A)
83. Pollen grain with polten tube represents :
(A) male sporophyte
(B) male gametophyte
(C) female sporophyte
(D) female gametophyte
Ans – (A)
84. How many nuclel are present in mature polten ?
(A) 1
(B) 2
(C) 3
(D) 4
Ans – (B)
85.Pollen gains are yellow due to :
(A) flavonoids and carotenoids
(B) sulphur
(C) chromoplast
(D) etiolin
Ans – (A)
86. Cytoplasm of pollen grain is rich in
(A) fat and starch
(B) protein
(C) starch and Ravonoids
(D) DNA
Ans – (A)
87. Cross polination is preferred over self pollination because it
(A) Produces better offspring
(B) Forms new varieties
(C) Induces parthenogenesis
(D ) ls economical
Ans – (A)
88. Anemophily occurs in………….
(A) Salvia
(B) Vallisneria
(C) Coconut
(D) Bottle brush
Ans – (C)
89. During formation of pollen grains, a microspore mother cell undergoes
(A) One meiotic division
(B) One mitotic division
(C) One meiotic and one mitotic division
(D) One meiotic and two mitotic division
Ans – (D)
90. Which of the following will help in making early germination of pollen on stigma ?
(A) P
(B) Ca++
(C) Mo
(D) CI–
Ans – (B)
91. Auxins contained in pollen grains stimulate growth of
(A) pollen tube as well as ovary
(B) only pollen tube
(C) only ovary
(D ) male gametes
Ans – (A)
92. Arrangement of nuclei in normal dicot embryo sac is :
(A) 3 + 3 + 2
(B) 2 + 3 + 3
(C) 3 + 2 + 3
(D) 2 + 4 + 2
Ans – (C)
