Here we have only discussed Pollination: Definition, Types, Agents & Process. ROBERT B. WYLIE. This is the only type of Pollination which during Pollination brings genetically different types of pollen grains to the stigma . Various types of pollination have also been identified based on the vectors of pollen grains or agents of pollination. Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. Each pollen grain is haploid: it has half of the DNA (genetic information) that is needed to make a new plant. There are two types of pollination, called self-pollination and cross-pollination. In contrast, cross-pollination leads to the union of unidentical gametes in the breeding system called outbreeding, also called outcrossing, allogamy, or xenogamy (Simpson 2010). Cross-pollination is the most common method of pollination. In water pollination, the male anther sheds its pollen grains on the water surface. — Pistillate flower has been pulled farther down in water; depression is cup-shaped, and staminate flowers stand at right angles to the verticle walls. Hybridismis the cross pollination which takes place between two genetic ally different plants. It occurs mainly in crops. Despite the dioecism and complete separation of the flowers in Vallisneria, pollination seems to take place with remarkable Fig. Since two types of fusions Syngamy and Triple fusion take place in an Embryo Sac the phenomenon is termed Double Fertilization . When the cross-pollination in a flower takes place with the help of water, it is called hydrophilous and the phenomenon is termed as hydrophily. In Vallisneria, the female flower reach the surface of water by the long stalk and the male flowers or pollen grains are released on to the surface of water. Cross-pollination: In cross-pollination, the pollen grains are transferred from the anther of one flower to the stigma of another flower of the same kind. Ans.As the pollination of Vallisneria takes place by means of water, the pollen grains are covered by mucilaginous coating that protects them. of cross-pollination. Pollen grain reach to the female flowers passively by water currents. Answer: Vallisneria pollination take place by water (Hydrophily). Self-pollination is the more basic type of pollination because it only involves one flower. Now in the next article, we will learn about Fertilization. In order for seeds to develop in nature, the cross-pollination must occur between the same or closely related species. 30 seconds . Pollen grains, which contain the male gametes, need to get to where the female gamete(s) are.. What happens is basically the same as sexual reproduction in animals. Xenogamyis the cross pollination which takes place between two different flowers of two different plants of same species. Seeds contain the genetic information to produce a new plant. Tags: Question 7 . Upon transfer, the pollen germinates to form the pollen tube and the sperm for fertilizing the egg. In water pollination, the male anther sheds its pollen grains on the water surface. Vallisneria is a submerged plant that spreads by runners and sometimes forms tall underwater meadows. Ancient History. Pollination by water is called hydrophily and the flowers pollinated by water are said to be hydrophilous (Example: Vallisneria, Hydrilla). The floral envelop of hydrophilous plants are reduced or absent. Pollination takes place with the help of external agents such as wind, water, and insects. In Vallisneria, Hydrilla Pollination takes place by water-Fertilization. Sexual reproduction in plants happens via the flowers, it takes place in two successive processes which are the pollination and the fertilization, it is the formation of offspring by the fusion of gametes while asexual reproduction is the formation of offspring without the fusion of gametes.. Cross pollination is of two types (i) Geitonogamy: When, pollination takes place in between the two flowers of the same plant then it is called geitonogamy. A and B only. Home. answer choices . SURVEY . Self pollination: Here transfer of pollen occur within the same flower. Cross-pollination is the transfer of pollen from the stamen of one flower to the pistil of another plant. At the same time, the male flowers get detached from the parent plant & fall on the surface of water. Though it seems like cross-pollination and takes place with the help of pollinator, both the gametes have the same plant as their origin. After the pollination fertilization takes place to develop the embryo. In angiosperms, pollination is defined as the placement or transfer of pollen from the anther to the stigma of the same flower or another flower. They are called the agents of pollination. Hence the name autogamy (Auto= self, gamy= pollination). All of the above. Plants adapted to use bats or moths as pollinators typically have white petals, strong scent and flower at night, whereas plants that use birds as pollinators tend to produce copious nectar and have red petals. One of the ways that plants can produce offspring is by making seeds. B only. Self pollination . Based on plants, cross-pollination is of two types- Xenogamy and hybrid ism. THE POLLINATION OF VALLISNERIA SPIRALIS. Self Pollination: It is the transfer of pollen grains from the anther of a flower to the stigma of either the same or genetically similar flower. Pollination is part of sexual reproduction in plants.It describes how the pollen grains get to the female parts of a plant. 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