Question:
The acceptance or rejection of the pollen by a pistil is mediated by:
The acceptance or rejection of the pollen by a pistil is mediated by:
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Chemical interactions are key in determining whether pollen can be accepted by a pistil.
Updated On: May 26, 2026
- Surface morphology of pollen similar to stigma
- Maturity of pollen and pistil
- Pollen size and length of style
- Chemical components of the pollen interacting with those of the pistil
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The Correct Option is D
Solution and Explanation
Step 1: Concept
Pollination and pollen--pistil recognition.
Step 2: Meaning
Specific chemical interactions ensure only compatible pollen can germinate on the stigma, promoting genetic diversity.
Step 3: Analysis
Option (D) is correct because specific recognition molecules (proteins, enzymes, glycoproteins) in pollen interact with corresponding molecules in the pistil. Compatible interactions allow pollen tube germination; incompatible interactions trigger rejection signals.
Step 4: Conclusion
The chemical components of the pollen interacting with those of the pistil mediate acceptance or rejection. Final Answer: (D)
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