Q 5. Q 4. Pollination in Adansonia digitata: In this plant, the ball of stamens and the stigma project beyond the floral envelops. (a) Zostera (b) Vallisneria (c) Hydrilla (d) cannabis 6. pollination, the following types of cross pollination are recognised. State the advantages of vivipary over ovipary. Because of the specific gravity of these pollen they freely float at any depth, A unique example of this type is Zostera mariana (a submerged marine perennial) in which pollen grains are long (up to 250pm) and needle-like resembling pollen tubes. Q 2. 1. In vallisneria, the female flowers reach the surface of water by the long stalk and the male flowers are released onto the surface of water. 2. Comparatively small and unattractive. Vallisneria. Because pollen grains have no power of independent movement. Question 5. Q 3. c Retinacules diverged, bar: 5 mm. 11. Phyllospadix scouleri, details of male spadix. How do sponge and Penicillium reproduce? There is no natural death in single-celled organisms why? 2. Give one example each. The male plant bears a large number of minute male flowers in a small spadix surrounded by a spathe and borne on a short stalk, whereas the female plant bears … Pollen grains are light weight and non-sticky; Stigama is feathery. Answer: Pollination brought about by the agency of wind is called anemophily. One of these is not an example of such outbreeding device. Grasses. ( Pollination is the mechanism to achieve this objective ). How Vallisneria and Seagrasses achieve pollination? ( 4 × 5 = 20 ) Question 27. I studied the effects of physical disturbance on genet dynamics and genotypic diversity in a clonal marine angiosperm, Zostera marina (eelgrass). Explain how some plants are adapted for achieving pollination through wind. In replicated plots of 1 m 2, the vegetation canopy was removed in gaps of zero (control), 25%, 50% and … Give the features of these plants to facilitate pollination. Based on the agents involved ¡n cross. underwater pollination referred to as hyphydrophily, e.g., Ceratophyllum, Majus, Zostera. d Anther dehiscence and pollen release commencing at base of spadix, bar: 1 mm Q 6. Adaptation in anemophillous flowers to achieve pollination. (2 marks each) Q 1. b Retinacules erected to form a marginal palisade, bar: 5 mm. Physical disturbance has often been invoked to control genotypic diversity in sessile clonal organisms, yet experimental evidence is lacking. Answer: 1. Explain the importance of syngamy and meiosis in a sexual life cycle of an organism. 5. Explain the mechanism of pollination in water plants like vallisneria and sea grass (Zostera). Answer: Types of cross pollination: Cross pollination is always brought about by some external ágentÅ¡. Fruits mature under the water. The bat holds the flower by clasping the stamen ball to its breast. a Young spadix (spathe removed), retinacules enclosing anthers, bar: 1 mm. Hydrophilous pollination in Phyllospadix 69 Fig. (3) Transfer of pollen grains ... of water pollinated plants are Vallisneria and Hydrilla which grow in fresh water and several marine sea-grasses such as Zostera. ... some of them reach the stigma and achieve pollination. Pollination takes place on the surface of the water with free-floating male flowers tipping into the surface depression created by the larger, attached female flowers. Flowers do not produce nector and fragrance. Which of the following is not a water pollinated plant? Flowering plants have developed certain outbreeding device to discourage self-pollination and to encourage cross – pollination . Wind pollination is common in grasses and water pollination in vallisneria. While taking nectar its breast becomes laden with numerous pollen grains, some of which get deposited on the stigma of the flower when it visits next. 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