Advertisements
Advertisements
प्रश्न
What are the adaptations which are required in self-pollinated plants?
उत्तर
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.
APPEARS IN
संबंधित प्रश्न
Why angiosperm anthers are called dithecous?
Name two characteristics of flowers in which pollination occur by wind.
In bisexual flowers, maturation of gynoecium before androecium is known as ______.
Coelacanth was caught in South Africa. State the significance of the discovery of Coelacanth in the evolutionary history of vertebrates.
Give an account of various abiotic agencies used in pollination along with their adaptations for pollination.
A particular species of plant produces light, non-sticky pollen in large numbers and its stigmas are long and feathery. These modifications facilitate pollination by ______.
Anemophily type of pollination is found in ______.
Correct definition of pollination is ______
Autogamy can occur in a chasmogamous flower if ______.
Mention any one example of the hydrophilous flower.
