#pollen grain

BOTANY

A pollen grain containing one vegetative ll and one generative ll is described as:

Bicellular pollen grains contain one vegetative ll and one generative ll. The generative ll may later divide to form two sperm lls. This follows from latest NCERT 2026-27 principle explaining the concept clearly for NEET students in simple steps as per rationalized syllabus.

Ref: NCERT Biology Textbook - Latest Edition for Academic Session 2026-27 (Botany section, Rationalized Textbook for Class XI and XII), Chapter: Biology - Botany portion (Latest NCERT Textbooks for Academic Session 2026-27 -

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BOTANY

In the pollen grain, which ll ultimately fuses with the egg ll?

The generative ll divides (often before or during pollen tube growth) to produce two sperm lls; one of these fuses with the egg ll. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.

Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Cell Structure and Function, Cell Cycle and Biomolecules, Topic: Cell organelles and biomolecular structure.

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plant Development - 1

Mature pollen grain typically consists of:

Mature angiosperm pollen at dispersal generally comprises two cells: large vegetative cell containing diffuse chromatin, abundant mitochondria, Golgi, ER, and cytoskeleton driving polarized tube tip growth and metabolism, and small generative cell engulfed within vegetative cytoplasm representing male germ lineage with condensed nucleus. Generative cell subsequently undergoes second mitosis producing two sperm cells essential for double fertilization. In tricellular species such as Arabidopsis, second mitosis occurs precociously inside anther before dehiscence. Bicellular organization ensures

Ref: McCormick, Plant Cell 1993: mature pollen typically bicellular with vegetative and generative cells before anthesis.

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Sexual Reproduction in flowering Plants

If a plant has 20 chromosomes in its root tip cells (2n=20), how many chromosomes will be present in the Generative cell

Root tip cells are diploid (2n=20), so n=10. Both the Generative cell and the Tube (Vegetative) cell are formed via mitosis from the haploid microspore. Therefore, both are haploid and contain n=10 chromosomes.

Ref: Diagram of a mature pollen grain showing the large vegetative cell and small generative cell.

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Sexual Reproduction in flowering Plants

Sporopollenin is one of the most resistant organic materials known. It is absent in which specific region of the pollen

Sporopollenin forms the hard outer layer called the exine. However, it is absent at specific apertures called germ pores to allow the pollen tube to emerge during germination. The intine is made of cellulose and pectin, not sporopollenin.

Ref: Scanning electron micrograph of a pollen grain showing the exine ornamentation and apertures.

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