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प्रश्न
Explain water pollination in detail with its types.
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
Make a list of any three outbreeding devices that flowering plants have developed and explain how they help to encourage cross-pollination.
What are chasmogamous flowers?
Why does self-pollination not lead to seed formation in self-incompatible species?
What is bagging technique?
Name two characteristics of flowers in which pollination occur by wind.
Give one word/term for the following:
Pollination of flowers by birds.
Differentiate between geitonogamy and xenogamy.
Choose the correct statement from the following.
Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by ______.
Heterostyly as a contrivance for cross-pollination is found in ______.
