Skip to content
Login Register

#cross-pollination

3 public questions tagged with this topic.

BOTANY

Which factor is most likely to enhance cross-pollination in flowering plants?

Structural and biochemical adaptations that prevent self-pollination promote cross-pollination, thereby increasing genetic diversity. 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 -

View Details
Plant Breeding 1

Which mechanism promotes outcrossing?

Outcrossing promotion accomplished through dichogamy and herkogamy among others. Herkogamy specifically involves spatial separation between anthers and stigma within same flower, preventing direct contact. Examples include pin and thrum morphs in Primula heterostyly, stigma exerted beyond anthers in some Solanum, and stamen filaments recurved away. Development controlled by auxin gradients and CYCLOIDEA TCP transcription factors influencing organ growth. Herkogamy forces pollinator to brush against anthers in one flower and deposit on stigma of different flower, reducing self-pollination and g

Ref: Barrett Floral Biology herkogamy; Richards Plant Breeding Systems; Faegri Pollination Mechanisms herkogamy.

View Details
Plant Breeding 1

Cross-pollination between different plants is called:

Xenogamy constitutes true outcrossing between genetically distinct individuals of same species, mediated by vectors carrying pollen across plants. Mechanism ensures fusion of gametes bearing dissimilar alleles, increasing heterozygosity and generating novel multilocus genotypes through recombination in meiosis. Many plants enforce xenogamy via self-incompatibility systems: gametophytic S-RNase in Solanaceae degrades self-pollen RNA, sporophytic SRK-SCR interaction in Brassicaceae triggers callose deposition blocking self-tube. Such biochemical barriers regulated by S-locus multiallelic haploty

Ref: de Nettancourt Incompatibility in Angiosperms; NCERT Biology Chapter Pollination Xenogamy; Lodish S-locus molecular biology.

View Details