CBSE 2025, Compartment, Set 1

Question

Assertion (A): All the events starting from pollen landing on stigma till pollen tube entering the ovule are included in pollen-pistil interaction.
Reason (R): Pollen-pistil interaction ensures that only suitable pollens germinate on the stigma.

Select the correct option: A). Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). B). Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). C). Assertion (A) is true, but Reason (R) is false. D). Assertion (A) is false, but Reason (R) is true.

Edvaya · Accepted Answer

The correct answer is Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).. **SOLUTION** **Assertion (A) is True:** The entire dynamic biological process—from pollen deposition on the stigma, its continuous chemical dialogue, germination, and pollen tube growth down the style to its ultimate entry into the ovule—is collectively defined as pollen-pistil interaction. **Reason (R) is True:** This interaction is fundamentally a continuous chemical dialogue mediated by chemical components of the pollen interacting with those of the pistil. Its primary evolutionary purpose is to actively recognize and ensure that only the "right" (compatible) pollen germinates and succeeds in fertilization, while rejecting incompatible ones.

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Biology > Reproduction And Genetics > Sexual Reproduction In Flowering Plants

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