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  • How does a bisexual flowering plant ensures cross pollination? Explain.        

How does a bisexual flowering plant ensures cross pollination? Explain.

 

 

 

 
 
 
 
 

Answers (1)

In bisexual flowering plants, cross-pollination is favored by:-

  1. In some species, pollen release and stigma receptivity are not synchronized. Either the pollen is released before the stigma becomes receptive or much before the release of pollen, thus preventing antogamy.
  2. In some other species, the anther and the stigma are placed at different positions so that the pollen cannot come in contact with the stigma of the same flower, thus preventing autogamy.
  3. Self-incompatibility - A genetic mechanism that prevents self pollen from the same flower or other flowers of the same plant) from fertilizing the ovules by inhibiting pollen germination or pollen tube growth in the pistil.
  4. Production of unisexual flowers - If both male and female flowers are present on the same plant such as castor and maize (monoecious), it prevents autogamy but not geitonogamy. In several species, such as papaya, male and female flowers are present on different plants, that is each plant is either male or female (dioecy). This prevents both autogamy and geitonogamy.
Posted by

Priyanka Kumari

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