ISC BIOLOGY Class-12 Chapter 2. Sexual Reproduction in Flowering Plants MCQ

ISC BIOLOGY

Class-12

Chapter 2. Sexual Reproduction in Flowering Plants

MCQ

1. Embryo sac occurs in—

(a) embryo

(b) axis part of embryo

(c) ovule

(d) stamen

2. Fertilization involving carrying of male gametes by pollen tube is—

(a) porogamy

(b) siphonogamy

(c) chalazogamy

(d) syngonogamy

3. One of the most resistant biological material is—

(a) lignin

(b) cutin

(c) sporopollenin

(d) cellulose

4. In angiosperms…………lead to the formation of a mature male gametophyte from a pollen mother cell.

(a) two meiotic divisions

(b) three mitotic division

(c) two mitotic and one meiotic division

(d) a single mitotic division

5. Fragrant flowers with well developed nectaries are an adaptation for—

(a) Chiropterophily

(b) Entomophily

(c) Anemophily

(d) Hydrophily

6. The transfer of pollen to the stigma of another flower of the same plant is called—

(a) autogamy

(b) allogamy

(c) anemophily

(d) none of these

7. Micropyle occurs in—

(a) ovary

(b) ovule

(c) seed

(d) Both (b) and (c)

8. Usually pollen grains are shed at—

(a) one-celled stage

(b) two-celled stage

(c) four-celled stage

(d) five-celled stage

9. Meiosis occurs in—

(a) endosperm cells

(b) intercalary meristems

(c) apical meristems

(d) spore mother cells

10. In angiosperms, triple fusion is required in the formation of—

(a) embryo

(b) endosperm

(c) suspensor

(d) fruit wall

11. …………discovered double fertilization in Lilium and Fritillaria.

(a) Nawaschin

(b) Strasburger

(c) Leeuwenhoek

(d) Both (a) and (b)

12. Sporopollenin occurs in—

(a) female gametophyte

(b) male gametophyte

(c) vegetative cells of pollen grain

(d) exine of pollen wall

13. Endosperm cell of an angiosperm has 36 chromosomes. The number of chromosomes in the gametes would be—

(a) 11

(b) 12

(c) 8

(d) 9

14. Embryo sac is also called—

(a) microspore

(b) megaspore

(c) megagametophyte

(d) microgametophyte

15. Sexual reproduction in flowering plants was discovered by—

(a) Carmerarius

(b) Nawaschin

(c) Strasburger

(d) Maheshwari

16. …………comprises the egg apparatus.

(a) Polar nuclei

(b) Antipodal cells

(c) Egg cell and synergids

(d) Male gametes

17. Which among the following exhibit Anemophily ?

(a) Salvia

(b) Vallisneria

(c) Coconut

(d) Bottle brush

18. Which among the following is triploid ?

(a) Megaspore

(b) Embryo

(c) Endosperm

(d) Microspore

19. Secondary nucleus is formed by the fusion of—

(a) antipodal cells

(b) egg apparatus

(c) two polar nuclei

(d) synergids

20. Starting from the innermost part, the correct sequence of parts in an ovule are—

(a) egg, nucleus, embryo sac, integument

(b) embryo sac, egg, nucellus, integument

(c) egg, embryo sac, nucellus, integument

(d) egg, embryo sac, integument, nucellus

21. ……is the phenomenon wherein, the ovary develops into a fruit without fertilization.

(a) Parthenocarpy

(b) Apomixis

(c) Sexual reproduction

(d) None of these

22. Larger nucleus in a pollen grain is called………

(a) tube nucleus (b) generative nucleus (c) callus (d) none of these

23. The ‘eyes’ of the potato tuber are………

(a) shoot buds

(b) axillary buds

(c) flower buds

(d) root buds

24. Filiform apparatus is a characteristics feature of—

(a) suspensor cells

(b) egg

(c) synergids

(d) zygote

25. Vegetative propagation in ginger is carried out by means of—

(a) rhizome

(b) tuber

(c) roots

(d) bulb

26. Double fertilization involve—

(a) Fertilization of the egg by two male gametes

(b) Fertilization of two eggs in the same embryo sac by two sperms brought by one pollen tube

(c) Fertilization of the egg and the central cell by two sperms brought by different pollen tubes

(d) Fertilization of egg and central cell by two sperms brought by the same pollen tube

27. Double fertilization is the process in plants that include—

(a) Syngamy and triple fusion

(b) Only triple fusion

(c) Development of antipodal cell

(d) None of the above

28. Ornithophily refers to the pollination by which of the following ?

(a) Insect

(b) Birds

(c) Snails

(d) Air

29. Seedless banana is—

(a) Parthenocarpic fruit

(b) Multiple fruit

(c) Drupe fruit

(d) Tree fruit

30. Synergids are—

(a) Haploid

(b) Diploid

(c) Triploid

(d) Tetraploid

31. Both autogamy and geitonogamy are prevented in—

(a) Papaya

(b) Cucumber

(c) Castor

(d) Maize

Ans. 1. (c), 2. (b), 3. (c), 4. (b), 5. (b), 6. (b), 7. (d), 8. (b), 9. (d), 10. (b), 11. (a), 12. (d), 13. (b), 14. (c), 15. (c), 16. (c), 17. (d), 18. (c), 19. (c), 20. (c), 21. (a), 22. (a), 23. (b), 24. (c), 25. (c).26. (a), 27. (a), 28. (b), 29. (a), 30. (a), 31. (a).