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Question : Define Autogamy.write the two different kindsof flowers that exhibit autogamy. |
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Answer» Solution :It is the transfer of pollen grains from the anther to STIGMA of the same flower. Two different kinds of flowers are: (i) Chasmogamous flowers (ii) Cleistogamous flowers. Detailed Answer: Autogamy When the pollen grains are transferred from the anther to the stigma of the same flower, it is KNOWN as autogamy. In flowers with exposed anthers and stigma, a complete autogamy is rare and hence the anthers and stigma should lie close to each other to enable self-pollination. Along with this there should be synchrony in pollen release and stigma re ceptivity. PLANTS like VIOLA (common pansy), Oxalis and Conimelina produce two types of flowers NAMELY Chasmogamous flowers and Cleistogamous flowers. (a) Chasmogamous flowers They are similar to flowers of other species with exposed anthers and stigma. (b) Cleistogamous flowers They do not open at all. Anthers and stigma lie close to each other. They are autogamous as there is no chance of cross-pollination. When anthers dehisce in the flower buds, pollen grains come in contact with the stigma for pollination. Cleistogamous flowers produce assured seed-set even in the absence of pollinators. |
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