Factors affecting self pollination
Answers
Explanation:
Dichogamy promotes cross pollination even in the hermaphrodite species.
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Bisexuality. Presence of male and female organs in the same flower is known as bisexuality. ...
Homogamy. Maturation of anthers and stigma of a flower at the same time is called homogamy. ...
Cleistogamy. ...
Chasmogamy. ...
Position of Anthers.
Answer:
1. Bisexuality. Presence of male and female organs in the same flower is known as bisexuality. The presence of bisexual flowers is a must for self pollination. All the self pollinated plants have hermaphrodite flowers.
2. Homogamy. Maturation of anthers and stigma of a flower at the same time is called homogamy. As a rule, homogamy is essential for self-pollination.
3. Cleistogamy. When pollination and fertilization occur in unopened flower bud, it is known as cleistogamy. It ensures self pollination and prevents cross pollination. Cleistogamy has been reported in some varieties of wheat, barley, oats and several other grass species.
4. Chasmogamy. Opening of flowers only after the completion of pollination is known as chasmogamy. This also promotes self pollination and is found in crops like wheat, barley, rice and oats.
5. Position of Anthers. In some species, stigmas are surrounded by anthers in such a way that self pollination is ensured. Such situation is found in tomato and brinjal. In some legumes, the stamens and stigma are enclosed by the petals in such a way that self pollination is ensured. Examples are greengram, blackgram, soybean, chickpea and pea.