Pollen grains are surrounded by mucilaginous covering, hence protected from wetting. Pollination occurs mostly within the seagrass meadow or adjacent meadows, and outcrossing is high in Zostera sp. Correct Answer: Zostera. (3) Transfer of pollen grains (shed from the anther) to the stigma of a pistil is termed pollination . The events shown below occur during different phases â ... Microspore and megaspores develop into the male and the female gametophytes respectively. ... Zostera marina Answer: (a) Eichornia crassipes. ; Guo, D.; Li, W.T., and Zhang, Q., 2016. scales. ... versa. (221. The purpose of resin in pines is to. The basal region of the body of the ovule where the nucellus, the integument and the funicle meet or merge is called chalaza. The ovule with one or two integuments are said to be unitegmic or bitegmic ovules respectively. ... Zostera; Question 3. This phenomenon is known as protogyny or protandry respectively. Answer: 1. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. The female gametophyte are retained on the parent sporophyte for variable period. Which is not feature of vegetative cell of pollen grain - (2) large size (l) haploid (3) spindle shape (4)irregular shape nucleus Q9.Exine is made chemically â (E.g. Seasonal variation in growth, morphology, and reproduction of eelgrass Zostera marina on the eastern coast of the Shandong Peninsula, China. Maize-wind pollination Vallisnaria-water pollination Sunflower â insect pollination. Zostera) are marine plant. Pollination in pines occurs when pollen enters openings between the Blank 1 of 1 of the female cone. Cross pollination cannot occur in cleistogamous flowers. Light unwettable pollen grains are present in these plants. Under water pollination occurs in . II. Students can solve NCERT Class 12 Biology Sexual Reproduction in Flowering Plants MCQs Pdf with Answers to [â¦] Pollination by water is quite rare in flowering plants. (2) As both types of gametes are non-motile, they have to be brought together for fertilisation to occur. (2011) that the low level of inbreeding observed was due to self-incompatibility resulting in seed abortion or seedling mortality. freshwater plants like Vallisneria, Hydrilla; marine water plants like Zostera). ... respectively. Be the first to write the explanation for this question by commenting below. ... (e.g. other land plants. Explanation: No explanation available. 2. The incidence of horizontal gene transfer plants is likely enhanced by associations with. The amounts of sexual and asexual reproduction differ within some species relying on geographic location and environmental factors. (Zipperle et al., 2011). Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants. This prevents the pollen from coming in contact with the stigma of the same flower. Differentiate between cleistogamous and chasmogamous flowers. ( Pollination is the mechanism to achieve this objective ). Options (a) Nymphaea (b) Zostera (c) Vallisneria (d) Ottelia. Suppose you are given four flowers namely maize, vallisneria, sunflower, and zostera. This is because cleistogamous flowers never open at all. Pollination carried out through water is called hydrophily. 2. Which of the aquatic plant show pollination under water - (l) Vallisneria (3)water lily (2) water hyacinth (4) zostera (28. Seagrasses form a unique group of submerged marine angiosperms capable of both sexual and asexual reproduction. Zhang, P.D. Zipperle et al. ; Liu, Y.S. State the mode of pollination in each flower. 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