Question 17: Explain the role of tapetum in the formation pollen-grain wall. Name the parts of an angiosperm flower in which development of male and female gametophyte take place. Viability of Seed: Ability of seed to retain the power of germination. (a) There are two types of flowers present in plants namely Oxalis and Viola − chasmogamous and cleistogamous flowers. Question 10: What is bagging technique? (b) Coleoptile and coleorrhiza; Reproduction is the process of multiplication of a particular species, and there are two modes of reproduction for every living being: asexual and sexual. During microsporogenesis, the cells of tapetum produce various enzymes, hormones, amino acids, and other nutritious material required for the development of pollen grains. Biology is basically the study of life and other elements that constitute it and has revolutionized the understanding of the human body. To remove the anthers, the flowers are covered with a bag before they open. As a result, no seed formation takes place. No enzyme can degrade it. Hence, at maturity, the female gametophyte appears as a 7-celled structure, though it has 8 nucleate. (4) Micropyle – It is a narrow pore formed by the projection of integuments. Chapter 2 – Sexual Reproduction in Flowering Plants, Chapter 5 – Principles of Inheritance and Variation, Chapter 6 – Molecular Basis of Inheritance, Chapter 9 – Strategies for Enhancement in Food Production, Chapter 12 – Biotechnology and its Applications, Chapter 15 – Biodiversity and Conservation, NCERT Solutions for Class XII Biology Chapter 2, Sexual Reproduction in Flowering Plants NCERT Solutions, MP Board Question Paper Class 12th 2020 for Travel and Tourism, MP Board Question Paper Class 12th 2020 for Retail, MP Board Question Paper Class 12th 2020 for Physical Education and Sports, MP Board Question Paper Class 12th 2020 for Health Care, NCERT Solutions Class 12 Biology Chapter 3 - Human Reproduction. Also, learn to draw and label diagrams such as parts of a typical angiosperm ovule or the appearance of a female gametophyte at maturity. Answer Self-pollination involves the transfer of pollen from the stamen to the pistil of the same flower. Chasmogamous flowers have exposed anthers and stigmata similar to the flowers of other species. Download Class 12 Biology NCERT Solutions in pdf free. Nucellus: Multicellular tissue in the centre of ovule in which embryo sac is present. It plays an important role in hybrid seed production. NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants to free download in PDF or Study Online Free in English Medium updated for new academic session 2020-21. 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Question 2: Differentiate between microsporogenesis and megasporogenesis. The solutions are prepared by the top teachers and experts at Embibe to help students. 1. Pollens of same other plants may remain viable for several months. The first mitotic division in the megaspore forms two nuclei. Revision Notes for Class 12 Biology CBSE quick revision note for class-12 Physics, Chemistry, Maths, Biology, and other subject are very helpful to revise the whole syllabus during exam days. Free downloadable chapter wise NCERT solutions for class 12 Science Biology in PDF format to help students in homework and score good marks in test and exams. (1) Funiculus – It is a stalk-like structure which represents the point of attachment of the ovule to the placenta of the ovary. (5) Nucellus – It is a mass of the parenchymatous tissue surrounded by the integuments from the outside. Answer Apomixis is the mechanism of seed production without involving the process of meiosis and syngamy. NCERT Solutions for Class 12 Biology Biology is basically a natural science that studies life and leaving organism like their physical structure, chemical process molecular interactions, physiological mechanism development, and evolution. This is because cleistogamous flowers never open at all. After this, the pollen tube enters one of synergids and releases two male gametes there. Get NCERT Solutions for Biology Class 11 & Class 12 in video format and text solutions. If you have any query regarding NCERT Solutions for Class 11 Biology at Work Chapter 2 Biological Classification, drop a comment below and we will get back to you at the earliest. If you liked our NCERT Solutions for Class 12 Biology, please share this post. When and why does a plant breeder employ this technique? Why do you think the zygote is dormant for some time in a fertilized ovule? NCERT Solutions for Class 12 Biology Chapter 2. 1. Book: National Council of Educational Research and Training (NCERT) Give reasons for your answer. Later, out of these four megaspores, only one functional megaspore develops into the female gametophyte, while the remaining three degenerate. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. It helps one see the bigger and clear picture of the planet and know what happens on the inside of the bodies of various organisms. Also, by sowing hybrid seeds, it is difficult to maintain hybrid characters as characters segregate during meiosis. 3. 30 Days Study Plan for IBPS RRB Officer Scale 1 and Office Assistant Prelims. It provides nourishment to the developing pollen grains. Students can solve NCERT Class 12 Biology Sexual Reproduction in Flowering Plants MCQs Pdf with Answers to […] Check out this Author's contributed articles. (6) Chalazal – It is the based swollen part of the nucellus from where the integuments originate. The embryonal axis has the radicle and root cap enclosed by a sheath called Coleorrhiza. Question 6: With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte. Why does self-pollination not lead to seed formation in self-incompatible species? Revise topics such as bagging technique, triple fusion, perisperm, epicotyl, integument, testa, hypocotyl, emasculation, apomixis, and more. NCERT Solutions for Class 12 Biology: Biology may seem to be easy but sometimes it might get tough. This process of fusion takes place inside the embryo sac. With a neat diagram, explain the 7-celled, 8 nucleate nature of female gametophyte. Custom Essay Writing Services: How to Choose the Right One? Question 9: What is self-incompatibility? Copyright 2020 by Tiwari Academy – A step towards Free Education. Since this process involves the fusion of three haploid nuclei, it is known as triple fusion. Pollens can be cryopreserved in liquid nitrogen (-196°C) in pollen banks. Reproductive Health. In an apple, the fleshy receptacle forms the main edible part. Two strategies that have evolved to prevent self-pollination in flowers are as follows: What is self-incompatibility? Why are pollen grains produced in enormous quantity in maize? It also produces the exine layer of the pollen grains, which is composed of the sporopollenin. This technique involves inducing fruit formation by the application of plant growth hormones such as auxins. Answer The zygote is formed by the fusion of the male gamete with the nucleus of the egg cell. It marks the point where the pollen tube enters the ovule at the time of fertilization. (2) Hilum – It is the point where the body of the ovule is attached to the funiculus. Self-pollination involves the transfer of pollen from the stamen to the pistil of the same flower. 4. From evolution theory, gene therapy, advances in biotechnology, and the biopharmaceuticals development for treating various illnesses a thorough understanding of biology help one become a better student of life. Get here NCERT Solutions for Class 12 Biology Chapter 2. NCERT Solutions for Class 12 Biology Chapter 2 – Sexual Reproduction in Flowering plants is important for the students appearing for board examinations and further. The plants which exhibit this phenomenon have the ability to prevent germination of pollen grains and thus, prevent the growth of the pollen tube on the stigma of the flower. To download NCERT Solutions for class 12 Physics, Chemistry, Biology, History, Political Science, Economics, Geography, Computer Science, Home Science, Accountancy, Business Studies and Home Science; do check myCBSEguide app or website. endosperm, further development of the embryo from the zygote starts. Autogamy: When pollen grains of a flower are transferred from anther to stigma of the same flower. When pollen grains fall on the stigma, they germinate and give rise to the pollen tube that passes through the style and enters into the ovule. What are chasmogamous flowers? The pollen grains mature and give rise to male gametes. Apomixis: Apomixis is a form of asexual repduction that mimics sexual reproduction where seeds are formed without fertilisation. Question 13: Differentiate between: NCERT Solutions for class 12 Science Biology solved by subject matter experts. Name the structures formed at the end of these two events. The female gametophyte (embryo sac) develops from a single functional megaspore. Human Health and Diseases of CBSE Board Class 10 Science Book will introduce you to the diseases and infections that a human body faces. unwanted pollen grains. 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