In which of the following mechanisms is there | vedclass

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(B) Herkogamy is a genetic mechanism in bisexual flowers where a physical barrier exists between the anther and the stigma to prevent self-pollination

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Herkogamy

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(B) Herkogamy is a genetic mechanism in bisexual flowers where a physical barrier exists between the anther and the stigma to prevent self-pollination.This barrier can be structural,such as the presence of a hood or a flap,or spatial,where the anthers and stigma are placed at different positions or heights,making it impossible for the pollen to reach the stigma of the same flower.- Heterostyly involves differences in the length of styles and stamens.- Dichogamy refers to the maturation of anthers and stigma at different times.- Self-incompatibility is a genetic mechanism that prevents pollen from fertilizing the ovules of the same flower.

Column-$I$	Column-$II$
$i$. Protandry	$a$. Calotropis
$ii$. Prepotency	$b$. Tobacco
$iii$. Self sterility	$c$. Sunflower
$iv$. Herkogamy	$d$. Apple

In which of the following mechanisms is there a physical barrier between the stigma and the anther in bisexual flowers?

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Column-$I$ Column-$II$
$i$. Protandry $a$. Calotropis
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$iv$. Herkogamy $d$. Apple

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