Example: Vallisneria § Pollination in Vallisneria. answered Oct 10, 2018 by Minu (46k points) selected Oct 10, 2018 by faiz . 5. Books. This plant species is a vital component of Poyang Lake ecosystem, as it purifies the water and provides food (tubers) for rare and endan- gered waterfowls, for example, Siberian crane (Grus leucogeranus) and white-naped crane (Grus vipio). Vallisneria is one of several genera in the Hydrocharitaceae in which staminate flowers detach completely from a spathe at the base ... flexuous peduncles, orient their opening at the water surface and pollination occurs when anthers of the floating staminate flowers contact the stigmas of the pistillate flowers. Insect pollinated flowers have coloured petals, big size and they offer fragrance and nectar to attract insects which bring about pollination in them. 3. In many aquatic plants with emergent flowers, pollination occurs by wind or insects, e.g., Lotus, Water Lily, Water Hyacinth. Answer: (d) Hygroscopic movement. In Vallisneria male and female flowers are produced on separate plants. 16. 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. Abundant and viable seeds produced. But it does not occur in all aquatic plants. NCERT NCERT Exemplar NCERT Fingertips Errorless Vol-1 Errorless Vol-2. In contrast, cross-pollination is the transfer of pollen from the anther in a flower in one plant to the stigma in a separate flower in another plant. Maths. However, in the sea pollination is a common event, as evidenced by Table I. C. Flowers emerge above water surface, and pollen is carried by wind. Xeno-gamy (Cross-Pollination): It involves the transfer of pollen grains from the flower of one plant to the stigma of the flower of another plant. Explain the process of pollination in Valltsnerta. ← Prev Question Next Question → Related questions 0 votes. I) Abiotic: Without involvement of animals the transfer occurs. Ans. Xenogamy: Here the pollination occurs in between flowers of two plants. The lower lip functions as sitting pad for insects. Be the first to write the explanation for this question by commenting below. NCERT RD Sharma Cengage KC Sinha. It yields new varieties. Chemistry. The male flowers get detached from the male plant and float on the surface of water. How does pollination take place in water hyacinth and water lily? Example: Zostera marina. In Vallisneria, pollination takes place by : (a) Water (b) Insect (c) Animal (d) Air Answer: (d) Air. What type of pollination takes place in Vallisneria? Options (a) Nymphaea (b) Zostera (c) Vallisneria (d) Ottelia. Vallisneria. Cross-pollination is the most common method of pollination. The 215 beginning of the erection of the styles is at time 0. Vallisneria americana is, as its specific epithet may indicate, native to North and South America. The pollination in Vallisneria occurs through the agency of water. Movement of male gamete towards archegonium in prothallus of fern is : (a) Thermotactic (b) Chemotropic (c) Chemotactic (d) Hygroscopic movement. Physics. Hydrophylly is of two types— hypohydrophily and epihydrophily. All these features are shown by coconut flower. Self-pollination usually occurs in hermaphrodite or dioecious plants, where a flower can pollinate by itself or less dependent on the external factors. Center for Watershed Ecology, Institute of Life Science and Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang University, Nanchang, 330031 China . D. Male flowers are carried by water currents to female flowers at surface of water . After maturation, the pistillate flowers are brought to the surface by their long stalk and form a cup-like depression. Jungles vals rarely reproduce through seeds indoor, and it usually only occurs in ponds or its natural habitat. Hydrophily occurs only in some 30 genera of mostly monocots e.g., Vallisneria, Zostera, Ceratophyllum, etc. That is the pollen from one flower reaches stigma of a flower on another plant. Correct Answer: Zostera. From this table and the observations in vitro, the course of flowering in the sea can be reconstructed approximately. It is of two types: Hypo hydrophily: The pollen grains float below the surface of water, and on reaching the stigma, coil around it and germinate. How is it different in water-lily, which is also an aquatic Plant ? Full text of "The Pollination of Vallisneria Spiralis" See other formats Early Journal Content on JSTOR, Free to Anyone in the World This article is one of nearly 500,000 scholarly works digitized and made freely available to everyone in the world by JSTOR. Explain the process of pollination in Vallisneria. 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