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If a wrong pollen (from other species or self-incompatible) lands on stigma
A. pollen germinates, but pollen tube cannot grow in style
B. pollen germinates, grows in style but cannot enter the ovary
C. does not germinate at all

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A only

A and C only

A, B, and C

B only

answer is D.

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Detailed Solution

When the pollen lands on the stigma, it is first recognised. It is followed by acceptance or rejection of the pollen. When the wrong pollen lands on the stigma there is no germination of pollen or growth of the pollen tube is prevented.

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