NCERT Solution – Biology Questions and Answers of Class 12 - Reproduction in Flowering Plants

76 Pick out the wrong statement.

[1] Sequoia, a gymnosperm, is one of the tallest trees

[2] Phaeophyceae members possess chlorophyll a, c, carotenoids and xanthophylls

[3] Double fertilization is unique to gymnosperms and monocotyledons

[4] Moss is gametophyte which consists of two stages namely, protonema stage and leafy stage

Answer: Double fertilization is unique to gymnosperms and monocotyledons

77 Male gametes in angiosperms are formed by the division of:

[1] Generative cell

[2] Microspore

[3] Microspore mother cell

[4] Vegetative cell

Answer: Generative cell

78 In an angiosperm, male plant is diploid and female plant tetraploid, endosperm will be

[1] Haploid

[2] Triploid

[3] Tetraploid

[4] pentaploid

Answer: pentaploid

79 Anemophillous flowers have

[1] Sessile stigma

[2] Small smooth stigma

[3] Coloured flower

[4] Large feathery stigma

Answer: Large feathery stigma

80 Endosperm of angiosperms results after fertilization from

[1] Synergids

[2] Secondary nucleus

[3] Antipodal cells

[4] Egg

Answer: Secondary nucleus

81 The aleurone layer in maize grain is specially rich in:

[1] Lipids

[2] Starch

[3] Proteins

[4] Auxins

Answer: Starch

82 The arrangement of the nuclei in a normal embryo sac in the dicot plants is

[1] 2 + 3 + 3

[2] 2 + 4 + 2

[3] 3 + 3 + 2

[4] 3 + 2 + 3

Answer: 3 + 2 + 3

83 Double fertilization was first discovered by Nawaschin (1898) in

[1] Lilium and Fritillaria

[2] Mango and Sugarcane

[3] Papaya and Pea

[4] Brassica and Candytuft

Answer: Lilium and Fritillaria

84 Insect pollinated flowers are characterized by

[1] large number of pollens

[2] dry and smooth pollens

[3] sticky and rough pollens

[4] Heavy pollens

Answer: sticky and rough pollens

85 Anthesis is

[1] Opening of flower bud

[2] Pollen mother cell undergoes meiosis

[3] Dehiscence of anthers

[4] Stigma becoming receptive

Answer: Opening of flower bud

86 Apomictic embryos in citrus arise from

[1] Maternal sporophytic tissue in ovule

[2] Synergids

[3] Diploid egg

[4] Antipodal cells

Answer: Maternal sporophytic tissue in ovule

87 Endosperm is formed during the double fertilization by:

[1] Ovum and male gamete

[2] One polar nuclei and one male gamete

[3] Two polar nuclei and one male gamete

[4] Two polar nuclei and two male gametes

Answer: Two polar nuclei and one male gamete

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