Advertisements
Advertisements
प्रश्न
Explain water pollination in detail with its types.
Advertisements
उत्तर
Definition:
Pollination carried out by water is called hydrophily.
Two types of hydrophily:
i. Hypohydrophily:
- In this pollination occurs below the surface of the water.
- Here the pollen grains are heavier than water, thus they sink down and caught by stigmas of female flowers.
- For e.g. In Zostera (sea grass) the pollen grains are long, ribbon-like, and without exine.
ii. Epihydrophily:
- In this pollination occurs on the surface of the water.
- The pollen grains float on the water surface and reach the stigma of the female flower.
- Vallisneria is a submerged dioecious, fresh water aquatic plant. In this, female flowers reach the water surface temporarily to ensure pollination and male flowers float on the surface of the water.
- The specific gravity of these pollen grains is equal to that of water. Due to which they float on the surface of the water.
- Due to water currents, pollen grains are carried to stigma and pollination occurs.
संबंधित प्रश्न
List the different types of pollination depending upon the source of pollen gain.
Write two ways in which pollination may occur in plants.
Describe the advantages and disadvantages of cross-pollination to the plant.
Type of interaction where an individual sacrifices its own welfare (life) for the benefit of another animal of its own species is ______.
Differentiate Between Cross Pollination and Self Pollination:
What are the adaptations which are required in self-pollinated plants?
Autogamy can occur in a chasmogamous flower if ______.
Both chasmogamous and cleistogamous flowers are present in ______.
In some plants anther and stigma mature at the same time this condition is called ______.
Comparatively a large amount of pollen grains are wasted during ______.
