Sexual Reproduction in Flowering Plants Previous Year Questions — NEET Biology

3 past-year Sexual Reproduction in Flowering Plants questions from NEET (Biology).

Q115 (2024)

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:
  1. D, A, C, B
  2. B, D, C, A
  3. B, D, A, C
  4. A, D, C, B
### Related Formula Developmental Sequence: Sporogenous tissue $\rightarrow$ Pollen Mother Cell (PMC) $\xrightarrow{\text{Meiosis}}$ Microspore tetrad $\rightarrow$ Pollen grains. ### Core Logic During microsporogenesis: 1. Sporogenous tissue (B) 2. Differentiates into Pollen Mother Cells / PMCs (D) 3. Undergoes meiosis to produce Microspore tetrads (A) 4. Tetrads dissociate into mature Pollen grains (C) ### Step 1: Conclusion The correct sequence is B $\rightarrow$ D $\rightarrow$ A $\rightarrow$ C. Correct option is (3). ### Pattern Recognition Sporogenous tissue (B) is the initial source tissue; Pollen grain (C) is the final product. Only option (3) begins with B and ends with C. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Biology: Sexual Reproduction in Flowering Plants

Q122 (2024)

Which one of the following is a triploid cell?
  1. Central cell
  2. Primary endosperm cell
  3. Zygote
  4. Synergid
### Related Formula Ploidy Levels: Synergid = $n$ Central cell = $n + n = 2n$ (before triple fusion) Zygote = $2n$ Primary Endosperm Cell (PEC) = $3n$ (after triple fusion) ### Core Logic Triple fusion between one male gamete ($n$) and the secondary nucleus ($2n$) forms the triploid ($3n$) Primary Endosperm Nucleus (PEN) within the Primary Endosperm Cell (PEC). ### Step 1: Selection Primary endosperm cell is triploid ($3n$). Option (2) is correct. ### Pattern Recognition Endosperm cell / PEC in angiosperms = Triploid ($3n$). ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Biology: Sexual Reproduction in Flowering Plants

Q134 (2024)

Which one of the following types of pollination brings genetically different types of pollen grains to the stigma?
  1. Geitonogamy
  2. Autogamy
  3. Xenogamy
  4. Cleistogamy
### Related Formula Autogamy: Same flower (genetically identical) Geitonogamy: Different flower, same plant (genetically identical) Xenogamy: Different flower, different plant (genetically different) ### Core Logic Xenogamy involves transfer of pollen grains from anther to stigma of a genetically different plant. It is the only type of pollination that brings genetically different pollen grains to the stigma. ### Step 1: Selection Xenogamy is the correct answer. Option (3) is correct. ### Pattern Recognition Genetically different pollen = Xenogamy. ### Evaluation Rubric / Model Answer null ### Chapter Mix Class 12 Biology: Sexual Reproduction in Flowering Plants
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JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%) | JEE Physics: Waves (+15.5%) | Electrostatics: Concentric Shells (-29.7%) | Modern Physics: Photoelectric Clones (+34.2%) | Mathematics: Definite Integrals (+18.1%) | Chemistry: Coordination Splitting (-11.4%)

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