It is a process before fertilization of flower. ← Prev Question Next Question → (iv)  Female flowers reach the surface of water. This phenomenon is called (1) Pseudo-pollination (2) Pseudo-parthenocarpy (3) Mimicry (4) Pseudo-copulation Sol. This table describes some differences: Read about our approach to external linking. 4. In some species the flower stalk (peduncle) coils into a spiral and pulls the ripening fruit below the water surface. State their importance in breeding experiments. Some species—namely, straight tape grass (Vallisneria spiralis) and American tape grass (V. americana)—are often grown in aquariums. anther to the stigma of the female reproductive part, i.e. so that they may be carried through water currents to the stigmas of female flowers to effect pollination at the water surface as it Vallisneria. pistil. During plant reproduction, pollen grains need to move from the anther of one flower to the stigma of another flower. In vallisneria, the female flowers are submerged in water. Accord­ingly, self pollination is of two types, autogamy and geitonogamy. Ans: In Vallisneria pollination is through hdrophilly ie through water. If the male flo­wer gets lodged into the depression, pollina­tion occurs. Students can solve NCERT Class 12 Biology Sexual Reproduction in Flowering Plants MCQs Pdf with Answers to […] Examples: Vallisneria spiralis, Elodea. (i)  Flowers are light, small and inconspicuous. Insects can pollinate flowers, and so can the wind. (iv) Female flowers reach the surface of water. The pollen then settles on the female reproductive part of … After pollination, the vallisneria ovary develops into a seed-bearing fruit. Pollination in flower is a mechanism of transfer of pollen grains from the male reproductory part, i.e. After maturation, the pistillate flowers are brought to the surface by their long stalk and form a cup-like depression. During plant reproduction, pollen grains. Pollination by water, hydrophily, uses water to transport pollen, sometimes as whole anthers; these can travel across the surface of the water to carry dry pollen from one flower to another. They reach the surface of water by the long stalks on reaching maturity. Our tips from experts and exam survivors will help you through. These must meet for reproduction to begin, a process called pollination. 7 3.PARTS OF FLOWER There are four whorls of a flower which are as follows:- Whorl #1: The Calyx The calyx, which is the outermost whorl of a flower, protects the inner whorls, especially when the flower … THE POLLINATION OF VALLISNERIA SPIRALIS ROBERT B. WYLIE (WITH PLATE IX AND SIX FIGURES) Vallisneria has long been counted one of the classic examples of cross-pollination. Insects can pollinate flowers, and so can the wind. Characteristically, Vallisneria prefers hard water and is rarely found in soft and acid water in nature. The male flowers get detached from the male plant and float on the surface of water. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants. Examples: Vallisneria spiralis, Elodea. (v) Male flowers are also released on the surface of water so that they may be carried through water currents to the stigmas of female flowers to effect pollination at the water surface as it Vallisneria. Pollination is of two types— self pollination and cross pollina­tion (Fig. Instead, the male flowers grow in clusters with short stems that break off and float to the surface of the water. Explain the process of emasculation and bagging of flowers. List the adaptive features of water-pollinated flowers like Vallisneria. — Pistillate flower has been pulled farther down in water; depression is cup-shaped, and staminate flowers stand at right angles to the verticle walls. 2.149), the flowers are borne under water. 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