If yes, then how? A) Grow in soil that lack both air and water done clear. Ce Question 10. • All aquatic plants are not Hydrophily. Draw a labelled figure by a mature pollen grain. They are not pollinated by biotic factors. © 2020 myCBSEguide | CBSE Papers & NCERT Solutions, Assertion is incorrect but reason is correct, Assertion is correct but reason is incorrect, They are not pollinated by biotic factors, Colour is not necessary for attention of bees, Strategies for Enhancement in Food Production, Class 12 Biology Evolution Chapter 7 Important Questions, Class 12 Biology Human Reproduction Extra Questions, Important Questions for Class 12 Biology Reproduction in Organisms, Extra Questions for Class 12 Biology Biodiversity and Conservation, Class 12 Biology Chapter 14 Ecosystem Extra Questions, Extra Questions for Class 12 Biology Biotechnology and its Applications, Class 12 Biology Microbes in Human Welfare Extra Questions, Extra Questions for Class 12 Biology Strategies for Enhancement in Food Production, Free Online Test Series for CBSE Students, Case Study based Questions Class 10 Mathematics, CBSE Class 10 English Sample Paper 2020-21, How to add Subjective Questions in Online Tests, The Best Mobile App for CBSE and NCERT Syllabus. occurred. Like other water-pollinated members of the Hydrocharitaceae family, the “female” flowers of hydrilla float on the surface of the water to facilitate pollination by free-floating “male” pollen-bearing flowers. This site is using cookies under cookie policy. If the chromosome number of a plant species is 20, what would be the chromosome number in its: (i) Pollen grains (ii) Endosperm cells? are free-floating. A – Chasmogamous flower, B – Cleistogamous flower, 7 cells – Antipodals (3), Secondary nucleus (1), Synergids (2), Egg cell (1). Can an unfertilised, apomictic embryo sac give rise to a diploid embryo? Yes, if the embryo develops from the cells of nucellus or integument, it will be diploid as nucellus and iteguments are diploid. Hydrilla Cannabis Answer : D Solution : Cannabis is a wind pollinated plant. Micropyle is minute opening in the ovule of a seed plant through which the pollen tube usually enters. Anther is a four sided structure consisting of four. Insects are not to be attracted. The students will not miss any concept in these Chapter wise question that are specially designed to tackle Board Exam. No ecological benefits are associated with Hydrilla within the United States. B) What is pollination? The hydrilla stem breaks easily in moving water or if disturbed by boats or wildlife. Problem: forms dense mats of vegetation that can interfere with aquatic recreation and destroy fish and wildlife habitat. …. The family is notable for the unique pollination mechanism of some genera (e.g., Elodea, Enhalus, Hydrilla, and Vallisneria). The pollen in some species travel on water surface while in … What then follows is fertilization, which is a boon of nature. a) pollination by insects b) pollination by wind c) pollination by water d) pollination by animal Answer: (a) pollination by insects. One square meter of can produce up to 5,000 tubers. e.g. myCBSEguide has just released Chapter Wise Question Answers for class 12 Biology.  There chapter wise Test papers with complete solutions are available for download in myCBSEguide website and mobile app. Microspore mother cells develop an internal layer of callose which breaks the plasmodesmal connections among themselves. Vallisneria is epihydrophily which occurs through the surface of the water. We have taken care of every single concept given in CBSE Class 12 Biology syllabus and questions are framed as per the latest marking scheme and blue print issued by CBSE for Class 12. Their colour has been fade up. Hydrilla Control: 4 Ways To Kill Hydrilla! Describe the structure of pollen grain and the process of its germination. Hydrophily is a fairly uncommon form of pollination whereby pollen is distributed by the flow of waters, particularly in rivers and streams. Question 4. … Zostera is mainly called as marine eelgrass and pollinated by water method . Some submersed species (tape grass) produce flowers and are pollinated underwater or at the water… CBSE Class 12 Biology Ch – 2 Practice Test, Ch-2 Sexual Reproduction in Flowering Plants. With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte. • In addition, you will not find petals • Stamens and sigmas are exposed to air currents however they do not take part in pollination. NCERT Solutions, NCERT Exemplars, Revison Notes, Free Videos, CBSE Papers, MCQ Tests & more. Once it nears the surface, it grows horizontally, forming thick, impenetrable mats. Water-pollinated plants do not invest in resources that attract pollinating organisms, such as showy flowers, nectar, and scent. These Extra Questions with solution are prepared by our team of expert teachers who are teaching grade in CBSE schools for years. No animal transfers are needed for Pollination . 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