MCQ Questions for Class 12 Biology: Ch 2 Sexual Reproduction in Flowering Plants

MCQ Questions for Class 12 Biology: Ch 2 Sexual Reproduction in Flowering Plants

1. Which of the following occupies central position in flower?
(a) Stamen
(b) Petals
(c) Sepal
(d) Pistil
► (d) Pistil

2. In a flowering plant, archesporium gives rise to
(a) Only tapetum and sporogenous cells
(b) Only the wall of the sporangium
(c) Both wall and the sporogenous cells
(d) Wall and the tapetum
► (c) Both wall and the sporogenous cells

3. Aestivation is the ________.
(a) Arrangement of accessary floral organs in relation to one another in bud condition.
(b) Arrangement of flowers on the axis.
(c) Arrangement of leaves at node
(d) Distribution of ovule inside the ovary
► (a) Arrangement of accessary floral organs in relation to one another in bud condition.

4. The scutellum observed in a grain of wheat or maize is comparable to which part of the seed in other monocotyledons?
(a) Cotyledon
(b) Endosperm
(c) Aleurone layer
(d) Plumule
► (a) Cotyledon

5. Unisexuality of flowers prevents
(a) Autogamy, but not geitonogamy
(b) Both geitonogamy and xenogamy
(c) Geitonogamy, but not xenogamy
(d) Autogamy and geitonogamy
► (a) Autogamy, but not geitonogamy

6. Endosperm is consumed by a developing embryo in the seed of
(a) Castor
(b) Coconut
(c) Pea
(d) Maize
► (c) Pea

7. Abundant occurrence of fossilized pollen grain is due to resistant: 
(a) Pectocellulose
(b) Pectolignin
(c) Sporopollenin
(d) Lignocellulose
► (c) Sporopollenin

8. Anemophily type of pollination is found in
(a) Vallisneria
(b) Salvia
(c) Coconut
(d) Bottle brush
► (c) Coconut

9. In oogamy, fertilization involves
(a) A small non-motile female gamete and a large motile male gamete
(b) A large non-motile female  gamete and a small motile  male gamete
(c) A large non-motile female gamete and a small non motile male gamete
(d) A large motile female gamete and a small nonmotile male gamete
► (b) A large non-motile female  gamete and a small motile  male gamete

10. An example of a seed with endosperm, perisperm, and caruncle is
(a) Coffee
(b) Lily
(c) Castor
(d) Cotton
► (c) Castor

11. The phenomenon wherein, the ovary develops into a fruit without fertilisation is called
(a) Apomixis
(b) Parthenocarpy
(c) Asexual reproduction
(d) Sexual reproduction
► (b) Parthenocarpy

12. In which one pair both the plants can be vegetatively propagated by leaf pieces?
(a) Agave and Kalanchoe
(b) Bryophyllum and Kalanchoe
(c) Asparagns and Bryophyllum
(d) Chrysanthemum and Agave
► (b) Bryophyllum and Kalanchoe

13. A typical angiospemic embryo sac is though 8 nucleate is 7-celled. 8 nuclei includes______.
(a) 2 egg apparatus, 3 polar nuclei and 3 antipodal
(b) 3 egg apparatus, 2 polar nuclei and 3 antipodal
(c) 3 egg apparatus, 3 polar nuclei and 2 antipodal
(d) None of the above
► (b) 3 egg apparatus, 2 polar nuclei and 3 antipodal

14. Pollen grain of large number of species can be stored in:  
(a) Liquid oxygen
(b) Liquid carbon dioxide
(c) Liquid sulphur dioxide
(d) Liquid nitrogen
► (d) Liquid nitrogen

15. In some plants, the anthers and stigma grow and mature at the same time. This phenomenon is called
(a) Syngamy
(b) Fusion
(c) Allogamy
(d) Homogamy
► (d) Homogamy

16. Which of the following plant contain unisexual flower?  
(a) Lotus
(b) Hibiscus
(c) Rose
(d) Papaya
► (d) Papaya

17. Maize is:
(a) Hygrophilous
(b) Anemophilus
(c) Cleistogamous
(d) Entomophilous
► (b) Anemophilus

18. The endosperm in angiosperm develops from
(a) Secondary nucleus
(b) Micropyler polar nucleus
(c) Zygote
(d) Chalazal polar nucleus
► (a) Secondary nucleus

19. A fruit developed from hypanthodium inflorescence is called
(a) Sorosis
(b) Syconus
(c) Caryopsis
(d) Hasperidium
► (b) Syconus

20. In which of the following plants endosperm is completely used up by developing embryo?
(a) Pea
(b) Castor
(c) Coconut
(d) Mango
► (a) Pea

21. The endosperm cells in angiosperms are
(a) Diploid
(b) Triploid
(c) Haploid
(d) Tetraploid
► (b) Triploid

22. In some plants anther and stigma mature at same time this condition is called?
(a) Chasmogamy
(b) Allogamy
(c) Homogamy
(d) Syngamy
► (c) Homogamy

23. Insect pollinated flowers are______.
(a) Colorful and contain nectar
(b) Small and without fragrance
(c) Colorless and without nectar
(d) Large and without fragrance
► (a) Colorful and contain nectar

24. Endosperm is consumed by developing embryo in the seed of
(a) Coconut
(b) Castor
(c) Pea
(d) Maize
► (c) Pea

25. An ovule which becomes curved so that the nucellus and embryo sac lie at right angles to the funicle is
(a) Hemitropous
(b) Campylotropous
(c) Anatropous
(d) Orthotropous
► (a) Hemitropous

26. What does the filiform apparatus do at the entrance into ovule?
(a) It helps in the entry of pollen tube into a synergid
(b) It prevents entry of more than one pollen tube into the embryo sac
(c) It brings about opening of the pollen tube
(d) It guides pollen tube from a synergid to egg
► (a) It helps in the entry of pollen tube into a synergid

27. A bilobed dithecous anther had 50 microspore mother cells per microsporangium. How many male gametes this anther can produce?  
(a) 400
(b) 800
(c) 100
(d) 200
► (b) 800

28. Number of nuclei participating in double fertilisation is?
(a) 2
(b) 5
(c) 4
(d) 3
► (b) 5

29. The thalamus is convex or conical; ovary develops at its tops while stamens, petals and sepals are borne successively below. This kind of floral arrangement is called?  
(a) Hypoganous and ovary superior
(b) Hypoganous and ovary inferior
(c) Perigamous and ovary superior
(d) Perigamous and ovary inferior
► (a) Hypoganous and ovary superior

30. The correct order of stages of embryogeny in dicotyledonous embryo is:
(a) Zygote>proembryo>globular embryo>heart-shaped embryo>mature embryo
(b) Zygote> globular embryo>heart-shaped embryo>proembryo>mature embryo
(c) Zygote>proembryo> heart-shaped embryo> globular embryo>mature embryo
(d) Zygote> globular embryo>proembryo>heart-shaped embryo>mature embryo
► (a) Zygote>proembryo>globular embryo>heart-shaped embryo>mature embryo

31. Which of the following is an example of false fruit?
(a) Apple
(b) Coconut
(c) Mango
(d) Papaya
► (a) Apple

32. How many meiotic divisions are required to form 64 pollen grains? 
(a) 64
(b) 80
(c) 16
(d) 32
► (c) 16

33. The meiocyte of an onion plant contains 32 chromosomes. Calculate the number of chromosomes found in its endosperm?
(a) 96 chromosomes
(b) 32 chromosomes
(c) 16 chromosomes
(d) 48 chromosomes
► (d) 48 chromosomes
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