It occurs mostly in the aquatic plants like Vallisneria, Hydrilla and Zostera etc. The goal of every living organism, including plants, is to create offspring for the next generation. 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. Here we have only discussed Pollination: Definition, Types, Agents & Process. Types of Pollination: Abiotic vs. Biotic. Based on plants, cross-pollination is of two types- Xenogamy and hybrid ism. Sugarcane, Maize, Wheat, Bamboo, Pinus, Papaya, Grasses, Typha, Datepalm, Coconut, Mulberry, Chenopodium, etc. General Science. In gymnosperms, pollination involves pollen transfer from the male cone to the female cone. (WITH PLATE IX AND SIX FIGURES) Vallisneria has long been counted one of the classic examples. They are called the agents of pollination. [hots; Delhi 2010] Ans.In Vallisneria,the male flowers are released on the water surface. 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. Later Vedic Civilization. of cross-pollination. Accord­ingly, self pollination is of two types, autogamy and geitonogamy. Hence the name autogamy (Auto= self, gamy= pollination). Ancient History. This type of pollination mainly observed in Graminae. 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. Though there are a number of aquatic plants, only in few plants pollination takes place by water. Then embryo developed into a whole plant after getting food and nutrition. The other plant must have the female sex organ known as the stigma. Male flowers grow on short stalks, become detached, and float to the surface. The pollen grains from male anthers settle on the stigma of the same flower. Seeds contain the genetic information to produce a new plant. But ecologically, it is considered as cross pollination. Only then fertilization can take place. Living vegetatively as a submersed aquatic, its dioecious flowers are brought together at the surface of the water. Ornithophily or bird pollination is the pollination of flowering plants by birds. A and B only. One of the plants must have the male plant sex organ known as the stamen. Cross pollination is always carried out by some agents. 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.. SURVEY . Pollination, especially cross-pollination takes place by four different agents like insects, wind, animals, and water. To summarize, the main insects that regularly pollinate flowers are bees. Chiropterophily or bat pollination is the pollination of flowering plants by bats. All of the above. A, C and D only . 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 the procedure of reproduction in plants. Indus Valley Civilization. e.g. THE POLLINATION OF VALLISNERIA SPIRALIS. This is the first step in the process of seed formation. 4. Home. Typical pollination happens when one plant gives pollen to another plant. Self pollination . Cross-pollination is the most common method of pollination. 30 seconds . Ans.As the pollination of Vallisneria takes place by means of water, the pollen grains are covered by mucilaginous coating that protects them. Anemophilous flowers are small and inconspicuous with long and versatile stamens. This can take various forms such as Cross-Pollination and Self-Pollination Pollination Agents This is a wider topic and concerns the many types of insects and birds that may visit sunflowers. Pollination is of two types: Each pollen grain is haploid: it has half of the DNA (genetic information) that is needed to make a new plant. Cross pollination. At the same time, the male flowers get detached from the parent plant & fall on the surface of water. It occurs mainly in crops. 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. When the wind blows, or an insect collects pollen from the male plant, it allows the pollen to transfer to the female plant. Many economically important trees are also wind pollinated, e.g.pines, spruces, fiirns etc. Early Vedic Civilization. The water pollinated plants are of two types : i) Hypohydrogamous: The pollination taking place in completely submerge condition under water e.g. ☰. in most ingenious fashion. This procedure requires at least one agent of pollination to move the pollen between male and female flowers. Self-pollination is the more basic type of pollination because it only involves one flower. Pollens are transported by winds. 4.Why do the pollen grains of Vallisneria have a mucilaginous covering? Pollen grain reach to the female flowers passively by water currents. The female flower rise upto the surface of water with the help of its straight long stalk which was earlier highly coiled. Anemophily is wind pollination. From the genetical point of view geitonogamy is self pollination because all flowers of the same plant are genetically identical. 2.16). — Pistillate flower has been pulled farther down in water; depression is cup-shaped, and staminate flowers stand at right angles to the verticle walls. Leaves arise in clusters from their roots.The leaves have rounded tips, and definite raised veins. After the pollination fertilization takes place to develop the embryo. The male gamete, present in the pollen grains of the anthers, needs to reach the female gamete in the ovary. answer choices . Pollination takes place with the help of external agents such as wind, water, and insects. ×. ROBERT B. WYLIE. Xenogamyis the cross pollination which takes place between two different flowers of two different plants of same species. 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). A) wind pollination B) Insect pollination C) water pollination D) explosive pollination . Name the type of cross pollination in vallisneria and bougainvillea Get the answers you need, now! Tags: Question 7 . Cross-pollination is the transfer of pollen from the stamen of one flower to the pistil of another plant. Since two types of fusions Syngamy and Triple fusion take place in an Embryo Sac the phenomenon is termed Double Fertilization . In Vallisneria, pollination takes place with the help of Water. 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. Various types of pollination have also been identified based on the vectors of pollen grains or agents of pollination. Which of the following is/are types of pollination? One of the ways that plants can produce offspring is by making seeds. Pollination which takes place by the help of wind is called anemophily.Wind picks up the pollen grains from the dehisced anther of a flower and drops them on the stigma of other flowers. Single white female flowers grow to the water surface on very long stalks. The floral envelop of hydrophilous plants are reduced or absent. Vallisneria is a submerged plant that spreads by runners and sometimes forms tall underwater meadows. 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. In water pollination, the male anther sheds its pollen grains on the water surface. Ceratophyllum. Though it seems like cross-pollination and takes place with the help of pollinator, both the gametes have the same plant as their origin. In order for seeds to develop in nature, the cross-pollination must occur between the same or closely related species. Self pollination: Here transfer of pollen occur within the same flower. Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. Pollen grains, which contain the male gametes, need to get to where the female gamete(s) are.. 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