iii) In Vallisneria pollination takes place by the agency of: a) Water b) Wind c) Birds d) Insects iv) The group of plants having naked seeds: a) Angiosperms b) Bryophyta c) Pteridophyta d) Gymnosperms v) Mammary glands are modified: a) Sweat glands b) Gastric glands c) Tear glands d) Sebaceous glands Once the seeds have matured, the female cone opens up releasing the seeds. This type of pollination takes place through the agency of insects. Seeds contain the genetic information to produce a new plant. It is of general occurrence among plants. Explain the process of pollination in Vallisneria .How is it different in water- lily , which is also an aquatic plant ? Water B. Fertilization then takes place and produces seeds after ripening in the protection of the female cone. ... the familiar aquarium plant, vallisneria, uses the water for pollination. The Anemophilous flowers produce an enormous amount of pollen grains, which are small, smooth, dry and light in weight. Answer: Vallisneria pollination take place by water (Hydrophily). — Pistillate flower has been pulled farther down in water; depression is cup-shaped, and staminate flowers stand at right angles to the verticle walls. In a species, the weight of newborn ranges from 2 to 5 kg 97% of the newborn with an average weight between 3 to 3.3 kg survive whereas 99% of the infants born with weights from 2 to 2.5 kg or 1.5 to 5 kg die Which type of selection process is taking place ? 4. Question 1. Wind C. Birds D. Insects (iv) The group of plants having naked seeds: A. Angiosperms B. Bryophyta C. Pteridophyta D. Gymnosperms (v) Mammary glands are modified: A. The goal of every living organism, including plants, is to create offspring for the next generation. 3. Kerala State Board New Syllabus Plus Two Botany Chapter Wise Previous Questions and Answers Chapter 2 Sexual Reproduction in Flowering Plants.. Kerala Plus Two Botany Chapter Wise Previous Questions Chapter 2 Sexual Reproduction in Flowering Plants. 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. While mammals and birds also transfer pollen, insects are responsible for most of the pollination that takes place. Eg:Zostera,Ceratophylum,Hydrilla b)EPIHYDROPHILY: Sweat glands B. Gastric glands C. Tear glands D. Sebaceous glands One of the ways that plants can produce offspring is by making seeds. Eg:Lemma,Zostera,Vallisneria TYPES OF HYDROPHILY: a)HYPOHYDROPHILY: It occurs below the surface of water. The main such adaptations are colour, nectar and scent. The pollination which takes place by means of water is known as hydrophily.It occurs only in aquatic plants.however,many aquatic plants with emerged flowers have other modes of pollination. Pollen grain reach to the female flowers passively by water currents. (iii) In Vallisneria pollination takes place by the agency of: A. The insect-loving flower possesses various adaptations by which they attract insects and use them as carriers of pollen grains for the purpose of cross-pollination. The floral envelop of hydrophilous plants are reduced or absent. Though there are a number of aquatic plants, only in few plants pollination takes place by water. Pollination is the act of transferring pollen grains from the male anther of a flower to the female stigma. (a) Pollination by the wind: The pollination with the help of wind is called Anemophily. Despite the dioecism and complete separation of the flowers in Vallisneria, pollination seems to take place with remarkable Fig. Pollination by water is called hydrophily and the flowers pollinated by water are said to be hydrophilous (Example: Vallisneria, Hydrilla). Cross – pollination takes place through the agency of animals, insects, wind and water. 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