NEET · Biology —

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

Year 2024 Total
Questions 3 3
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Which one of the following is a triploid cell?

Solution & Explanation

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).

Chapter Mix

Class 12 Biology: Sexual Reproduction in Flowering Plants

Reference Study Guides

Sexual Reproduction In Flowering Plants

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Q115 neet_2024_05_may_morning Microsporogenesis Steps
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:
  • A. D, A, C, B
  • B. B, D, C, A
  • C. B, D, A, C
  • D. A, D, C, B

Solution

Related Formula

Developmental Sequence: Sporogenous tissue arrow Pollen Mother Cell (PMC) Meiosis Microspore tetrad arrow Pollen grains.

Core Logic

During microsporogenesis:

  • Sporogenous tissue (B)
  • Differentiates into Pollen Mother Cells / PMCs (D)
  • Undergoes meiosis to produce Microspore tetrads (A)
  • Tetrads dissociate into mature Pollen grains (C)
Step 1: Conclusion

The correct sequence is B arrow D arrow A arrow 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.

Chapter Mix

Class 12 Biology: Sexual Reproduction in Flowering Plants

Q134 neet_2024_05_may_morning Types of 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

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.

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%)