Contrivances For Self Pollination In Plants, Biology
Contrivances for self-pollination:
Although cross-pollination seems to be favoured by nature, there are cases where self-pollination is ensured. For self-pollination the following adaptations are found in plants:
1. Bisexuality or Hermaphroditism: The presence of both reproductive organs in a flower is called bisexuality and flower is said to be bisexual. It is only in bisexual flowers that self-pollination can take place.
2. Homogamy: It simply means that both the sex organ mature at the same time e.g., Mirabilis, etc.
3. Cleistogamy: In cleistogamous flowers the pollens are shed within the closed flowers so that self-pollination is obligatory. Cleistogamy is seen in the underground flowers of Commelina benghalensis, Oxalis, Pisum, Arachis, Viola tricolor, etc.
Posted by Andrew | Posted Date: 7/2/2011 12:19:39 PM