What Are the Adaptations Which Are Required in Self-pollinated Plants? - Biology

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Short Note

What are the adaptations which are required in self-pollinated plants?

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Solution

Adaptations required by cross-pollinated plants are:
(i) Unisexuality - The stamens and carpels are found in different flowers. The male and female flowers may be borne on the same or different plants.
(ii) Dichogamy - In bisexual flowers, stamens and carpels mature at different times. It is of two kinds:
(a) Protandry wherein stamens mature before carpels. E.g - jasmine
(b) Protogyny wherein carpels mature before stamens. E.g. - Rose
(iii) Heterostyly - Here the style is either longer or shorter, thereby preventing self-pollination.
(iv) Herkogamy - Stigma, and stamen mature at the same time, but some type of barrier prevents self-pollination. E.g. - In caryophyllaceous flower, the stigma projects beyond the stamens so that pollens cannot fall on it.
(v) Self-sterility - Pollen of one flower cannot fertilize the female gametes of the same flower.

Concept: Pollination
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APPEARS IN

Frank Class 9 Biology ICSE
Chapter 8 Pollination and Fertilization
Exercise | Q 4.2 | Page 72
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