MCQ Questions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants
Q.1. A dicotyledonous plant bears flowers but never produces fruits and seeds. The most probable cause for the above situation is
(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.
Q.2. 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
Q.3. In a cereal grain, the single cotyledon of embryo is represented by
Q.4. In angiosperms, male gametes are formed by the division of
(a) microspore mother cell
(c) generative cell
(d) vegetative cell
Q.5. During microsporogenesis, meiosis occurs in
(b) microspore mother cells
(c) microspore tetrads
(d) pollen grains.
Q.6. From among the sets of terms given below, identify those that are associated with the gynoecium.
(a) Stigma, ovule, embryo sac, placenta
(b) Thalamus, pistil, style, ovule
(c) Ovule, ovary, embryo sac, tapetum
(d) Ovule, stamen, ovary, embryo sac
Q.7. Starting from the innermost part, the correct sequence of parts in an ovule are
(a) egg, nucellus, embryo sac, integument
(b) egg, embryo sac, nucellus, integument
(c) embryo sac, nucellus, integument, egg
(d) egg, integument, embryo sac, nucellus
Q.8. From the statements given below choose the option that are true for a typical female gametophyte of a flowering plant.
(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)
Q.9. Autogamy can occur in a chasmogamous flower if
(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.
Q.10. In a typical complete, bisexual and hypogynous flower the arrangement of floral whorls on the thalamus from the outermost to the innermost is
(a) calyx, corolla, androecium and gynoecium
(b) calyx, corolla, gynoecium and androecium
(c) gynoecium, androecium, corolla and calyx
(d) androecium, gynoecium, corolla and calyx
Q.11. Choose the correct statement from the following.
(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
Q.12. 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
Q.13. Unisexuality of flowers prevent
(d) both geitonogamy and xenogamy
Q.14. 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
Q.15. From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
(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
Q.16. In a fertilised embryo sac, the haploid, diploid and triploid structures are
(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.
Q.17. Dioecy states
(a) unisexuality of a flower
(b) bisexuality of a flower
(c) bisexuality of a plant
(d) unisexuality of a plant
Q.18. Transfer of pollen grains from the anther to the stigma of another flower of same plant is called
Q.19. While planning for an artificial hybridisation programme involving dioecious plants, which of the following steps would not be relevant?
(a) Bagging of female flower
(b) Dusting of pollen on stigma
(d) Collection of pollen
Q.20. In angiosperms, a functional megaspore develops into
(a) embryo sac
(d) pollen grain
Q.21. Scutellum is
(a) grass embryo
(b) grass seed
(c) grass fruit
(d) grass cotyledon
Q.22. In the embryos of a typical dicot and a grass, true homologous structures are
(a) coleorhiza and coleoptile
(b) coleoptile and scutellum
(c) cotyledons and scutellum
(d) hypocotyl and radicle.
Q.23. The phenomenon observed in some plants wherein parts of the sexual apparatus is used for forming embryos without fertilisation is called
(c) vegetative propagation
(d) sexual reproduction.
Q.24. In an embryo sac, the cells that degenerate after fertilisation are
(a) synergids and primary endosperm cell
(b) synergids and antipodals
(c) antipodals and primary endosperm cell
(d) egg and antipodals.
Q.25. Function of germ pore is
(a) emergence of radicle
(c) growth of pollen tube
(d) release of male gamete
Q.26. 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
(c) a few haploid and a few diploid
(d) with varying ploidy.