Sexual Reproduction in Flowering Plants: Class 12 Previous Year Questions

Sexual Reproduction in Flowering Plants questions asked in CBSE board exams

Repeated questions first. Open the free app to see each question as it appeared in the paper, with its marking scheme.

1. _________ Page 15 of 24 { } 24. Draw a neat diagram of enlarged view of one microsporangium of a Young anther of an angiosperm. Label the different layers of the wall and write the functions of the outermost and innermost layer. 3 _________ Page 16 of 24 { } 2…
   Board 20263 marksshort answer
2. (a) (i) Explain the role of stigma in pollen pistil interaction. 1 (ii) Describe the post pollination events leading to double fertilization in angiosperms starting with 2-celled pollen grain. 4 OR (b) (i) Explain menstrual phase in the menstrual cycle of huma…
   Board 20265 markslong answer
3. (a) Do all pollen grains remain viable for the same length of time ? Support your answer with two suitable examples. 2½ (b) How are pollen grains stored in pollen banks ? ½
   Board 20263 marksshort answer
4. _________ Page 11 of 24 { } 18. (a) (i) How does a farmer use dormancy of seed to his advantage ? 1 (ii) Differentiate between pea seed and castor seed. 1 OR (b) Identify the stage of follicle where primary oocyte undergoes first meiotic division. Also mention…
   Board 20262 marksshort answer
5. Given below are stages of embryo sac formation from megaspore mother cell. Identify the correct option for the cell division marked a, b, c and d. 1 (A) a – Meiosis-I, b – No division, c – Mitosis, d – Meiosis-II (B) a – Meiosis-I, b – Meiosis-II, c – No divis…
   Board 20261 markMCQ
6. Assertion (A) : Apomixis leads to production of genetically identical off- springs. 1 Reason (R) : Apomixis involves fertilization between two genetically similar plants.
   Board 20261 markAssertion-Reason
7. Student to attempt either option-(A) or (B) : (A)(a) Distinguish between the two cells enclosed in a mature male gametophyte of an angiosperm. (b) Study the diagram given below showing the modes of pollination. Answer the guestions that follow. 21/Page (i) (ii…
   Board 20255 markscase-based
8. (a) A bilobed dithecous anther has 2oo microspore mother cells per microsporangium. How many male gametophytes can be produced by this anther ? (b) Write the composition of intine and exine layers of a pollen grains.
   Board 20253 marksshort answer
9. Student to attempt either option (A) or (B) : (A)(i) Write two crucial changes, the seed undergoes while reaching maturity that enable them to be in a viable state until the onset of favourable conditions. (i) Name the oldest viable seed excavated from Arctic …
   Board 20252 marksshort answer
10. How many pollen grains and ovules are likely to be formed in the anther and the ovary of an angiosperm bearing 50 microspore mother cells and 50 megaspore mother cells respectively ? (A)100, 25 (B)200, 50 (C)50, 50 (D)200, 100 11.1 Evolution of modern man invo…
    Board 20251 markMCQ
11. Given below is a diagram of T.S. of a monocot seed with parts I, II & III labelled : Choose the option where parts I, II and III are identified correctly. (A) Pericarp, Endosperm, Scutellum (B) Pericarp, Endosperm, Coleorhiza (C) Scutellum, Pericarp, Coleorhiz…
    Board 20251 markMCQ
12. (a) (i) Explain the process of double fertilization in an angiosperm starting from the germination of pollen grains on the stigma, mentioning the ploidy of the end products formed at the end. State the role of synergids during the course of the process. 4 (ii)…
    Board 20245 markslong answer
13. (a) Name any two copper releasing intra-uterine devices. State two reasons that make them effective contraceptives. 2 OR (b) Name any two outbreeding devices that flowering plants have developed and explain how they help in encouraging cross-pollination.
    Board 20242 marksshort answer
14. In which of the following plants are both male and female flowers born on the same plant and the mode of pollination can be geitonogamy or xenogamy ? (A) Papaya (B) Date Palm (C) Maize (D) Spinach
    Board 20241 markMCQ
15. Choose the option that gives the correct number of pollen grains that will be formed after 325 microspore mother cells undergo microsporogenesis. (a) 325 (b) 650 (c) 1300 (d) 975
    Board 20231 markMCQ
16. JJJJ Page 31 33. (a) Given below is a diagrammatic representation of a human ovum. (i) and . (ii) This ovum is released from the ovary with incomplete meiotic division. When, where and how is the meiotic division completed ? (iii) How does an ovum ensure the e…
    Board 20235 markslong answer
17. JJJJ Page 15 18. (a) From which end of the ovule, and how does the pollen tube gain its entry into the embryo sac of a Hibiscus flower ? (b) State the fate of the male nuclei present in the pollen tube.
    Board 20232 marksshort answer
18. (a) Explain the process of the development of a male gametophyte in an angiosperm. (b) Why is it called a male gametophyte ?
    Board 20232 marksshort answer
19. Assertion (A) : Endosperm is completely consumed during the development of embryo in ex-albuminous seeds. Reason (R) : Castor, pea and beans are all examples of ex-albuminous seeds.
    Board 20231 markAssertion-Reason
20. Outbreeding helps in the maintenance of an organism's ability to survive and perpetuate its genetic material. This is termed as biological fitness. (a) What is the term used to signify reduction of such biological fitness? (b) Explain one method of outbreeding…
    CBSE practice 2022-233 marksshort answer

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