#2 Biology Class XII Sexual Reproduction in Flowering Plants (NEET, MHTCET) MCQ
1) In a typical complete, bisexual and hypogynous flower the arrangement of floral whorls on the thalamus from the outermost to the innermost is [NCERT Exemplar]
(a) calyx, corolla, androecium and gynoecium
(b) calyx, corolla, gynoecium and androecium
(c) gynoecium, androecium, corolla and calyx
(d) androecium, gynoecium, corolla and calyx
Answer
(a) calyx, corolla, androecium and gynoecium
2) A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is [NCERT Exemplar]
(a) plant is dioecious and bears only pistillate flowers
(b) plant is dioecious and bears both pistillate and staminate flowers
(c) plant is monoecious
(d) plant is dioecious and bears only staminate flowers.
Answer
(d) plant is dioecious and bears only staminate flowers.
3) In a cereal grain, the single cotyledon of embryo is represented by
(a) coleoptile
(b) coleorhiza
(c) scutellum
(d) hypocotyl
Answer
(c) scutellum
4) Which of the following is true for typical bilobed anther?
(a) 2 theca, 2 sporangia
(b) 4 theca, 4 sporangia
(c) 4 theca, 2 sporangia
(d) 2 theca, 4 sporangia
Answer
(d) 2 theca, 4 sporangia
5) The outermost and innermost wall layers of microsporangium in an anther are respectively [NCERT Exemplar]
(a) endothecium and tapetum
(b) epidermis and endodermis
(c) epidermis and middle layer
(d) epidermis and tapetum
Answer
(d) epidermis and tapetum
6) In angiosperms, male gametes are formed by the division of
(a) microspore mother cell
(b) microspore
(c) generative cell
(d) vegetative cell
Answer
(a) microspore mother cell
7) During microsporogenesis, meiosis occurs in [NCERT Exemplar]
(a) endothecium
(b) microspore mother cells
(c) microspore tetrads
(d) pollen grains.
Answer
(b) microspore mother cells
8) From among the sets of terms given below, identify those that are associated with the gynoecium. [NCERT Exemplar]
(a) Stigma, ovule, embryo sac, placenta
(b) Thalamus, pistil, style, ovule
(c) Ovule, ovary, embryo sac, tapetum
(d) Ovule, stamen, ovary, embryo sac
Answer
(a) Stigma, ovule, embryo sac, placenta
9) Starting from the innermost part, the correct sequence of parts in an ovule are [NCERT Exemplar]
(a) egg, nucellus, embryo sac, integument
(b) egg, embryo sac, nucellus, integument
(c) embryo sac, nucellus, integument, egg
(d) egg, integument, embryo sac, nucellus
Answer
(b) egg, embryo sac, nucellus, integument
10) From the statements given below choose the option that are true for a typical female gametophyte of a flowering plant. [NCERT Exemplar]
(i) It is 8-nucleate and 7-celled at maturity
(ii) It is free-nuclear during the development
(iii) It is situated inside the integument but outside the nucellus
(iv) It has an egg apparatus situated at the chalazal end
(a) (i) and (iv)
(b) (ii) and (iii)
(c) (i) and (ii)
(d) (ii) and (iv)
Answer
(c) (i) and (ii)
11) Autogamy can occur in a chasmogamous flower if [NCERT Exemplar]
(a) pollen matures before maturity of ovule
(b) ovules mature before maturity of pollen
(c) both pollen and ovules mature simultaneously
(d) both anther and stigma are of equal lengths.
Answer
(c) both pollen and ovules mature simultaneously
12) Dioecy states
(a) unisexuality of a flower
(b) bisexuality of a flower
(c) bisexuality of a plant
(d) unisexuality of a plant
Answer
(d) unisexuality of a plant
13) Choose the correct statement from the following. [NCERT Exemplar]
(a) Cleistogamous flowers always exhibit autogamy
(b) Chasmogamous flowers always exhibit geitonogamy
(c) Cleistogamous flowers exhibit both autogamy and geitonogamy
(d) Chasmogamous flowers never exhibit autogamy
Answer
(a) Cleistogamous flowers always exhibit autogamy
14) Which of the following structures are haploid in nature?
(a) nucellus and antipodals
(b) Microspore and antipodals
(c) Egg cell and antipodals
(d) Egg and central cell
Answer
(c) Egg cell and antipodals
15) Filiform apparatus performs the function of
(a) opening the pollen tube
(b) guiding the pollen tube to egg
(c) entry of pollen tube into synergids
(d) prevents growth of more than one pollen tube
Answer
(b) guiding the pollen tube to egg
16) Unisexuality of flowers prevent
(a) geitonogamy
(b) autogamy
(c) xenogamy
(d) both geitonogamy and xenogamy
Answer
(b) autogamy
17) A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by [NCERT Exemplar]
(a) insects
(b) water
(c) wind
(d) animals.
Answer
(c) wind
18) From among the situations given below, choose the one that prevents both autogamy and geitonogamy. [NCERT Exemplar]
(a) Monoecious plant bearing unisexual flowers
(b) Dioecious plant bearing only male or female flowers
(c) Monoecious plant with bisexual flowers
(d) Dioecious plant with bisexual flowers
Answer
(b) Dioecious plant bearing only male or female flowers
19) In a fertilised embryo sac, the haploid, diploid and triploid structures are [NCERT Exemplar]
(a) synergid, zygote and primary endosperm nucleus
(b) synergid, antipodal and polar nuclei
(c) antipodal, synergid and primary endosperm nucleus
(d) synergid, polar nuclei and zygote.
Answer
(a) synergid, zygote and primary endosperm nucleus
20) In an embryo sac, the cells that degenerate after fertilisation are [NCERT Exemplar]
(a) synergids and primary endosperm cell
(b) synergids and antipodals
(c) antipodals and primary endosperm cell
(d) egg and antipodals.
Answer
(b) synergids and antipodals
21) Transfer of pollen grains from the anther to the stigma of another flower of same plant is called
(a) geitonogamy
(b) autogamy
(c) xenogamy
(d) cross-pollination
Answer
(a) geitonogamy
22) While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps would not be relevant? [NCERT Exemplar]
(a) Bagging of female flower
(b) Dusting of pollen on stigma
(c) Emasculation
(d) Collection of pollen
Answer
(c) Emasculation
23) In angiosperms, a functional megaspore develops into
(a) embryo sac
(b) endosperm
(c) ovule
(d) pollen grain
Answer
(a) embryo sac
24) Scutellum is
(a) grass embryo
(b) grass seed
(c) grass fruit
(d) grass cotyledon
Answer
(d) grass cotyledon
25) In the embryos of a typical dicot and a grass, true homologous structures are [NCERT Exemplar]
(a) coleorhiza and coleoptile
(b) coleoptile and scutellum
(c) cotyledons and scutellum
(d) hypocotyl and radicle.
Answer
(c) cotyledons and scutellum
26) The phenomenon observed in some plants wherein parts of the sexual apparatus is used for forming embryos without fertilisation is called [NCERT Exemplar]
(a) parthenocarpy
(b) apomixis
(c) vegetative propagation
(d) sexual reproduction.
Answer
(b) apomixis
27) In a flower, if the megaspore mother cell forms megaspores without undergoing meiosis and if one of the megaspores develops into an embryo sac, its nuclei would be [NCERT Exemplar]
(a) haploid
(b) diploid
(c) a few haploid and a few diploid
(d) with varying ploidy.
Answer
(b) diploid
28) Function of germ pore is
(a) emergence of radicle
(b) absorption
(c) growth of pollen tube
(d) release of male gamete
Answer
(c) growth of pollen tube
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