NEET · Biology —

Sexual Reproduction in Flowering Plants appeared 3 times across 1 year — 3.3% of Biology. This question is from Microsporogenesis.

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Questions 3 3
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Arrange the following in the correct developmental sequence related to microsporogenesis : A. Microspore tetrads B. Sporogenous tissue C. Pollen grains D. Pollen mother cells Choose the correct answer from the options given below:

Solution & Explanation

Core Logic

The process of formation of microspores from a pollen mother cell (PMC) through meiosis is called microsporogenesis.

The developmental sequence is:

  • Sporogenous tissue (B) fills the center of the young microsporangium.
  • As the anther develops, the sporogenous cells differentiate into Pollen Mother Cells (PMCs) or microspore mother cells (D).
  • Each PMC undergoes meiosis to form a cluster of four haploid cells called a Microspore tetrad (A).
  • As the anthers mature and dehydrate, the microspores dissociate from each other and develop into Pollen grains (C).
Step 1: Final Conclusion

The correct sequence is B → D → A → C.

Pattern Recognition

Tissue -> Mother Cell -> Tetrad (intermediate) -> Pollen Grain (mature product). This is a logical biological progression from undifferentiated mass to individual mature gametophytes.

Chapter Mix

Class 12 Biology: Sexual Reproduction in Flowering Plants

Reference Study Guides

Sexual Reproduction In Flowering Plants

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Q122 neet_2026_03_may_morning Double Fertilization
Which one of the following is a triploid cell?
  • A. Central cell
  • B. Primary endosperm cell
  • C. Zygote
  • D. Synergid

Solution

Core Logic

Let's determine the ploidy of each cell type in angiosperms:

  • Synergid: Haploid (n), part of the unfertilized egg apparatus.
  • Zygote: Diploid (2n), formed by fusion of a male gamete (n) and the egg cell (n).
  • Central cell: Initially binucleate (n+n) forming a secondary nucleus (2n) before fertilization.
  • Primary endosperm cell (PEC): Formed when the second male gamete (n) fuses with the secondary nucleus (2n). Therefore, it is Triploid (3n).
Step 1: Final Conclusion

The Primary endosperm cell is the triploid cell.

Pattern Recognition

Double fertilization in angiosperms: syngamy produces a 2n zygote, triple fusion produces a 3n primary endosperm nucleus/cell (PEC).

Chapter Mix

Class 12 Biology: Sexual Reproduction in Flowering Plants

Q134 neet_2026_03_may_morning Pollination
Which one of the following types of pollination brings genetically different types of pollen grains to the stigma?
  • A. Geitonogamy
  • B. Autogamy
  • C. Xenogamy
  • D. Cleistogamy

Solution

Core Logic

Pollination types are categorized by the source of pollen:

  • Autogamy: Pollen from the same flower (genetically identical).
  • Cleistogamy: Autogamy in closed flowers (genetically identical).
  • Geitonogamy: Pollen from another flower on the same plant (functionally cross-pollination, but genetically identical).
  • Xenogamy: Pollen from a flower of a completely different plant of the same species. This is the only type that brings genetically different pollen grains to the stigma.
Step 1: Final Conclusion

Xenogamy (cross-pollination) ensures genetic variation.

Pattern Recognition

Xeno = strange/foreign. Xenogamy implies a 'foreign' genetically distinct plant.

Chapter Mix

Class 12 Biology: Sexual Reproduction in Flowering Plants

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