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Question
Explain water pollination in detail with its types.
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Solution
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.
RELATED QUESTIONS
As a senior biology student you have been asked to demonstrate to the students of secondary level in your school, the procedure(s) that shall ensure cross-pollination in a hermaphrodite flower. List the different steps that you would suggest and provide reasons for each one of them.
Geitonogamous flowering plants are genetically autogamous but functionally cross-pollinated. Justify.
Write two ways in which pollination may occur in plants.
Differentiate between the following:
Self pollination and cross pollination.
What is a flower? Draw a typical flower and label its different parts.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Male and female flowers are present on different plants (dioecious) to ensure xenogamy, in ______.
From among the situations given below, choose the one that prevents both autogamy and geitonogamy.
Name the following:
One plant each of Hypohydrophily and epihydrophily.
Comparatively a large amount of pollen grains are wasted during ______.
