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Class 12 Biology (NCERT)

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Ch-1: Sexual Reproduction in Flowering Plants 12 Questions

Before You Practice

Try each question on your own first. Use the Show Answer button only after you have selected your option, then read the explanation and revise the related concept from your chapter notes.

Chapter Notes

1. The male gametophyte in flowering plants is the:

  • A. Pollen grain
  • B. Ovule
  • C. Anther wall
  • D. Stigma

2. The outer, tough layer of the pollen grain made of sporopollenin is called the:

  • A. Exine
  • B. Intine
  • C. Tapetum
  • D. Tectum

3. Double fertilization in flowering plants was discovered by:

  • A. Nawaschin
  • B. Strasburger
  • C. Charles Darwin
  • D. Gregor Mendel

4. In double fertilization, the fusion of a male gamete with the two polar nuclei (triple fusion) results in the formation of the:

  • A. Primary endosperm nucleus, which develops into the endosperm
  • B. Zygote
  • C. Embryo directly
  • D. Pollen tube

5. Pollination occurring within the same flower is called:

  • A. Autogamy
  • B. Geitonogamy
  • C. Xenogamy
  • D. Allogamy

6. The transfer of pollen grains from the anther of one flower to the stigma of a genetically different flower on the same plant is termed:

  • A. Geitonogamy
  • B. Autogamy
  • C. Xenogamy
  • D. Cleistogamy

7. The endosperm tissue in angiosperm seeds is typically:

  • A. Triploid (3n)
  • B. Diploid (2n)
  • C. Haploid (n)
  • D. Tetraploid (4n)

8. The functional megaspore in an ovule develops into the:

  • A. Embryo sac (female gametophyte)
  • B. Pollen grain
  • C. Endosperm directly
  • D. Seed coat

9. Apomixis in flowering plants refers to the:

  • A. Formation of seeds without the process of fertilization
  • B. Formation of pollen without meiosis
  • C. Vegetative propagation exclusively
  • D. Process of cross pollination

10. The integuments surrounding the ovule eventually develop into the:

  • A. Seed coat
  • B. Endosperm
  • C. Cotyledon
  • D. Embryo

11. The structure that encloses the ovule and later develops into the fruit wall (pericarp) is the:

  • A. Ovary wall
  • B. Anther wall
  • C. Filament
  • D. Stigma

12. Vivipary, where seeds germinate while still attached to the parent plant, is a special adaptation commonly seen in:

  • A. Mangrove plants such as Rhizophora
  • B. Desert plants only
  • C. Aquatic plants only
  • D. Grasses
Ch-2: Human Reproduction Ch-3: Reproductive Health Ch-4: Principles of Inheritance and Variation Ch-5: Molecular Basis of Inheritance Ch-6: Evolution Ch-7: Human Health and Diseases Ch-8: Microbes in Human Welfare Ch-9: Biotechnology - Principles and Processes Ch-10: Biotechnology and its Application Ch-11: Organisms and Populations Ch-12: Ecosystem Ch-13: Biodiversity and its Conservation