Answer An ovule is a female megasporangium where the formation of megaspores takes place. Your email address will not be published. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants. Answer. The answers are also provided for reference. (2) Hilum – It is the point where the body of the ovule is attached to the funiculus. In parthenocarpy, the fruit is produced without the fertilization of the female gamete. This ensures that the flower is pollinated by pollen grains obtained from desirable varieties only. Question 15:What is meant by emasculation? In all flowering plants, fertilization occurs after pollination and germination. CBSE Class 12 Biology Ch – 5 Test Papers. Apomixis is the process in which the seeds are produced without fertilization but the process occurs in the female reproductive tract of the plant. Answer Various artificial hybridization techniques (under various crop improvement programmes) involve the removal of the anther from bisexual flowers without affecting the female reproductive part (pistil) through the process of emasculation. Full time entrepreneur, likes to indulge in writing reviews about the latest technologies apart from helping students in career and exam related topics. State the function of the male gametes. During polyembryony, if one embryo is formed from synergids and the other from nucellus, state the one that is haploid and the one that is diploid. The flowers have nectar and a pleasant fragrance. It develops genetic incompatibility between individuals of the same species or between individuals of different species. A.2. Mention the kind of carpel in the diagram given below. Why is it that the generative cell of 2-celled pollen divides in a pollen tube and not of 3-celled pollen? Q.3. When a pollen grain is shed at the 3-celled stage, which three cells are found? So working out from Class 12 Worksheets is of great help. They possess small male flowers that are not clearly visible. The pollinating agents are involved in transferring pollen grains from the male to the female part of the flower. Generative cell, Q.5. Question 16: If one can induce parthenocarpy through the application of growth substances, which fruits would you select to induce parthenocarpy and why? What are the characteristics of wind, water and insect-pollinated flowers? Furthermore, these previous year question papers completely eliminate the fear of exams from students. Describe the structure of the embryo sac of a mature angiosperm. Answer The zygote is formed by the fusion of the male gamete with the nucleus of the egg cell. Pollen grains are microscopic structures that carry the male reproductive cells of a plant. Download as PDF. Such plants pollinate by the process of cross-pollination. We have divided the questions according to chapters, and each questions is picked up from various sources, like . The pollen grains are sticky and can easily stick to the insect’s body. A.10. Other plants that have their flowers submerged in water release their pollen in the water that drifts in the water and are caught by the feathery stigma of female flowers. However, in two-celled pollen, the generative cell moves down the pollen tube and divides to form two male gametes. After completion of studying each chapter from each subject, it is important to know what questions can appear from the chapter in the Class 12 board exams. A.20.A flower plays a vital role in the reproduction process of a plant. Explain the structure of the pollen. The questions in these free online tests or quizzes are important for CBSE Class 12 Biology Board Exam as well as Medical Entrance Exams. Free PDF download of Important Questions for CBSE Class 12 Biology prepared by expert Biology teachers from the latest edition of CBSE (NCERT) books. The endosperm provides food for the growing embryo and after the formation of the Answer There are two types of flowers present in plants namely Oxalis and Viola − chasmogamous and cleistogamous flowers. Later, out of these four megaspores, only one functional megaspore develops into the female gametophyte, while the remaining three degenerate. Also, learn to draw and label diagrams such as parts of a typical angiosperm ovule or the appearance of a female gametophyte at maturity. At the micropylar end, out of the four nuclei only three differentiate into two synergids and one egg cell. A.5. One male gamete nucleus and two polar nuclei are involved in this process. Which regions of pistil form fruits and seeds? If you liked our NCERT Solutions for Class 12 Biology, please share this post. The offsprings produced by apomixis are genetically identical to the parent. Give reasons for your answer. A.1. However, all flowers have unique layers. As the anther matures, these microspores dissociate and develop into pollen grains. A single megaspore gives rise to the embryo sac, hence called monosporic embryo sac. 12th Biology chapter 2 Sexual Reproduction in Flowering Plants have many topics. Q.17. A.9. Answer Emasculation is the process of removing anthers from bisexual flowers without affecting the female reproductive part (pistil), which is used in various plant hybridization techniques. A.14. Similarly, at the chalazal end, three out of four nuclei differentiates as antipodal cells. Discuss Your Questions Here and share your views with us through Discussion Forum. A.4. Get here NCERT Solutions for Class 12 Biology Chapter 2. based on new pattern of CBSE. There are different types of flowers in a plant kingdom. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Q.23.What are the main layers of a flower? The stigma is feathery and can catch pollen from the wind. When and why does a plant breeder employ this technique? This type of pollination makes use of both biotic and abiotic agents like wind, water, insects, birds, animals, and other agents as pollinators. Answer Fruits derived from the ovary and other accessory floral parts are called false fruits. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students who can Practice CBSE Class 12 Biology Multiple Choice Questions with Answers to improve your score in … Class 12 Biology notes according to FBISE syllabus. Thus, incompatibility prevents breeding. Class 12 Biology important questions. of Files: 3 PDF Files Year : 2019 8000+ Downloads 12th Biology. If the megaspore develops into an embryo sac without mitotic division, it will give rise to a diploid embryo. BIOLOGY NOTES FOR CLASS 12 DOWNLOAD IN PDF . We hope that our NCERT Solutions for 12 Biology helped with your studies! Together they are known as the egg apparatus. NCERT Solutions for Class 12 Biology Chapter 6 Molecular Basis of Inheritance to download free in PDF file or Study Online without downloading updated for new academic year 2020-21 based on NCERT Books 2020-2021. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs. Biology Important Questions Class 12 are given below chapter wise. Male gametes, egg cell, polar nuclei, synergid, pollen tube. Out of the two male gametes, one gamete fuses with the nucleus of the egg cell and forms the zygote (syngamy). These varieties thus obtained are highly productive. Class XII Biology Chapter 2 Sexual Reproduction in Flowering Plants. Then, these emasculated flowers are wrapped in bags to prevent pollination by 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. Cross-Pollination: This type of pollination occurs in self-incompatible plants. Find Chapter wise free online test of Biology Class 12. A.23. The female reproductive parts of the flower include carpels, pistils, stigma, style and an ovary, which are collectively termed the gynoecium. 12th class Biology Chapter 2 Support and Movements Short Question Answers Below 1.What does growth ring indicates? Class 12 Biology NCERT textbook contains 16 chapters. The important questions are selected by experts to cover all the important topics of the chapters. Chapter 1. The four main layers of a flower: A.24.Morphogenesis is defined as a biological process which controls the growth, development in size, shape and structure and distribution of cells during the embryonic development of an organism. Now, if you have purchased the pdf file, then don’t let them go waste, do practice them. Q.3. How is it useful in a plant breeding programme? Register online for Biology tuition on Vedantu.com to score more marks in CBSE board examination. A.21.Cross-Pollination is the complex type of pollination during which the pollen grains are transferred from the anther of one flower into the stigma of another flower. This is known as monosporic development of the female gametophyte. This phenomenon is known as protogyny or protandry respectively. It only undergoes mitosis and hence produces diploid cells in the embryo sac. (d) Perisperm and pericarp. Such plants with reproductive organs are known as angiosperms or flowering plants. Q.5. Animals, birds, insects, wind and other biotic and abiotic agents are all examples of pollinating agents. Watch Queue Queue. A.1. Students can solve NCERT Class 12 Biology Sexual Reproduction in Flowering Plants MCQs Pdf with Answers to […] Here we have given NCERT Class 12 Biology Important Questions Chapterwise State Board. These MCQ's are extremely critical for all CBSE students to score better marks. This is because apomixis is a form of asexual reproduction in which the female reproductive apparatus is used. On maturity, the embryo sac of the angiosperms consists of 8 nuclei and 7 cells. The four main layers of a flower: The other structures including the corolla, calyx, and other remaining parts of the androecium and gynoecium degenerate or fall off. Here is the list of important questions from all chapters for CBSE Class 12 Biology for both Class 12 board Exams and NEET Exams. a) Selection of parents b) Emasculation c) Bagging d) Collection of pollen e) Dusting of pollen on the stigma f) Rebagging. The ovule develops into the seed. This technique involves inducing fruit formation by the application of plant growth hormones such as auxins. This takes place in the megaspore mother cell. It protects the reproductive organs of a plant. It can easily understand How does pollination occur in such plants? Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants. Incompatibility may be between individuals of the same species or between individuals of different species. (b) Coleoptile and coleorrhiza; Q.8. Free Download CBSE Class 12 Biology Important Questions in PDF format. Q.6. This process is called bagging. A.1. It is a complex process in all flowering plants. Important questions, guess papers, most expected questions and best questions from 12th Biology chapter 2 Sexual Reproduction in Flowering Plants have CBSE chapter wise important questions with solution for free download in PDF format. Q.1. Q.7. Question 10: What is bagging technique? The Class 12 Biology Chapter 5 Principles of Inheritance and Variation Important Questions by Vedantu have been handpicked by the subject experts. Q.9. With the help of the Class 12 Biology chapter solutions, learn about concepts such as megasporogenesis, microsporogenesis, self-pollination in flowers, etc. Answer Fertilization, gametogenesis, insemination, gestation, parturition, implantation. Therefore, the seedless varieties of economically important fruits such as orange, lemon, water melon etc. Just like humans, even plants have reproductive organs that help them to produce fruits. To remove the anthers, the flowers are covered with a bag before they open. How is the condition achieved in a fertilized ovule? Is it possible that an unfertilized apomictic embryo sac gives rise to a diploid embryo? Free PDF download of Important Questions for CBSE Class 12 Biology prepared by expert Biology teachers from the latest edition of CBSE (NCERT) books. A.2. The synergids are responsible for the reproduction in an angiosperm. Good to use, nice explanation. Chapter … Practising given Class 12 Biology Chapterwise Important Questions with solutions will help in scoring more marks in your Board Examinations. Get here NCERT Solutions for Class 12 Biology Chapter 2.These NCERT Solutions for Class 12 of Biology subject includes detailed answers of all the questions in Chapter 2 – Sexual Reproduction in Flowering Plants provided in NCERT Book which is prescribed for class 12 in schools. During fertilization, a pollen tube grows into one of the synergids. Q.7. One male gamete fuses with the nucleus of the egg cell, while the other male gamete moves towards the two polar nuclei present in the central cell and fuses with it to form a triploid primary endosperm nucleus. Chapter 4. CCBSE Overall Important Question papers Class 12 Biology 2019 with Solution Price: ₹ 105 No. Chapter 2 Class 12 Inverse Trigonometric Functions. Q.16. It results in the formation of the endosperm. Revise topics such as bagging technique, triple fusion, perisperm, epicotyl, integument, testa, hypocotyl, emasculation, apomixis, and more. Also, it is a cost-effective method for producing seeds. SEXUAL REPRODUCTION IN FLOWERING PLANTS . (6) Chalazal – It is the based swollen part of the nucellus from where the integuments originate. Check out other chapters of Important questions for CBSE class 12 Biology prepared by Entrancei. The tube ceases growth, ruptures and releases two sperm cells. A few among them vary in colour, structure, shape, etc. A.17. Question 11: What is triple fusion? Q.10.Explain the events which occur after the process of fertilization in plants. This is a genetic mechanism in which the germination of pollen grains or the pollen tube growth in the pistil is inhibited which prevents the pollen from fertilizing the ovules. These embryos give rise to virus-free plantlets and are healthy. After the process of fertilization, the following events occur: Q.1. Which type of cell division occurs during these events? Question 14: Why is apple called a false fruit? The zygote remains dormant for some time and waits for the endosperm to form, which develops from the primary endosperm cell resulting from triple fusion. The method of producing hybrid seeds by cultivation is very expensive for farmers. After this, the pollen tube enters one of synergids and releases two male gametes there. Q.9. Check out the list below! The pollen grains mature and give rise to male gametes. Chapter 1 Class 12 Relation and Functions. Page Contents. The nucellus provides nutrition to the developing embryo. It helps in pollination by attracting insects and other animals prior to transfer pollen grains. Subject wise and topic wise. List out the agents of pollination. In a few species, the diploid egg cell does not undergo reduction division and forms an embryo without fertilization. Role of Synergids Solving questions after the completion of each chapter will make you become perfect chapter … Class: 12th Class Teachoo has listed all the important questions for your Class 12 Board Exams. They are large with bright-coloured petals to attract insects. Can cross-pollination occur in cleistogamous flowers? CBSE previous year question papers help in improving the performance of students during exams. A.8. A chasmogamous bisexual flower prevents self-pollination in the following ways: Q.2. Book: National Council of Educational Research and Training (NCERT) What are the component cells of the egg apparatus in an embryo sac? (a) Yes, parthenocarpy is different from apomixis. Q.1. In this, the anther and the stigma mature at different times so cannot come in contact with each other. Which part(s) of the flower forms the fruit? The pollen grains from the male flower are transferred to the stigma of the female flower. Answer Apomixis is the mechanism of seed production without involving the process of meiosis and syngamy. The embryos can develop directly from the nucellus or synergids. In this, the megaspore mother cell does not undergo meiosis. Free Download CBSE Class 12 Biology Important Questions in PDF format. Question 7: What are chasmogamous flowers? During microsporogenesis, the cells of tapetum produce various enzymes, hormones, amino acids, and other nutritious material required for the development of pollen grains. A large number of pollens are released in water that is caught by large, feathery stigma of female flowers. It accommodates the sex organs of the plant. Hence, it is a false fruit. Learn More. consist of all types of questions starting from one marks to 5 marks. Question 3: Arrange the following terms in the correct developmental sequence: Students can solve NCERT Class 12 Biology Sexual Reproduction in Flowering Plants MCQs Pdf with Answers to […] A.7. It is used for the production of fruits without seeds such as banana and grapes for commercial purposes. Chapter Wise Important Questions Class 12 Biology. While studying the chapter or undergoing a quick recap before the exams the important questions of Biology Class 12 Chapter 5 … The first mitotic division in the megaspore forms two nuclei. Embryo developed from the synergid- haploid Embryo developed from the nucellus- diploid. REPRODUCTIVE HEALTH. (4) Micropyle – It is a narrow pore formed by the projection of integuments. Here you will find Chapter Wise NCERT MCQ Questions for Class 12 Biology with Answers PDF Free Download based on the important concepts and topics given in the textbook. Book: National Council of Educational Research and Training (NCERT) Cross-pollination is of two types: Q.2. Free PDF download of Important Questions with Answers for CBSE Class 12 Biology Chapter 8 - Human Health and Disease prepared by expert Biology teachers from latest edition of CBSE(NCERT) books. How do self-incompatible plants pollinate? Q.4. CBSE Class 12th Chapter Wise Biology Important Questions And Answers and class 12 Biology important notes PDF. The pollen is smooth, light can be blown easily by wind and are in large numbers. It also produces the exine layer of the pollen grains, which is composed of the sporopollenin. Important Questions for CBSE Class 12 Chemistry Chapter 1 The Solid State Chapter 2 Solutions Chapter 3 Electrochemistry Chapter 4 Chemical Kinetics Chapter 5 Surface Chemistry Chapter 6 General Principles And Processes Of Isolation Of Elements Chapter 7 The p-Block Elements Chapter 8 The d- and f-Block Elements Chapter 9 Coordination Compounds Chapter 10 Haloalkanes […] Chapter 5. It is used for the commercial production of hybrid varieties and in the production of virus-free varieties. Answer CBSE Class 12 Biology Chapter-wise Notes presented by Vidyakul offer students with the summary of the chapters, important points to remember, detailed explanation of important concepts and illustrations for better comprehension and retaining of the chapter content. If you liked our NCERT Solutions for Class 12 Biology, please share this post. How is it exploited commercially? The endosperm is a triploid tissue in a fertilized ovule. Is there any difference between apomixis and parthenocarpy? Q.1. 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. A.16. On the contrary, true fruits are those fruits which develop from the ovary, but do not consist of the thalamus or any other floral part. This video is unavailable. Does apomixis require fertilization and pollination? When more than one embryo occurs in a seed, it is referred to as polyembryony. Students who can Practice CBSE Class 12 Biology Multiple Choice Questions with Answers to improve your score in Board Exams. triple fusion. A.3. The essential functions of flowers are mentioned below: For more information on Sexual Reproduction in Flowering Plants Class 12 or any other topics, please visit BYJU’S Biology or download the BYJU’S app for further reference. ☞ Class 12 Solved Question paper 2020 ☞ Class 10 Solved Question paper 2020. The flowers can produce diaspores without fertilization. Self-incompatibility is a genetic mechanism in which the growth of the pollen tube in the pistil is inhibited which prevents self pollens from fertilizing the ovules. Get here NCERT Solutions for Class 12 Biology Chapter 2.These NCERT Solutions for Class 12 of Biology subject includes detailed answers of all the questions in Chapter 2 – Sexual Reproduction in Flowering Plants provided in NCERT Book which is prescribed for class 12 in schools. Flowers provide nectar to certain birds and insects. endosperm, further development of the embryo from the zygote starts. A.19.In all flowering plants, the post-fertilization is a critical stage which occurs after the double fertilization and includes the series of steps: Q.20.What are the male and female reproductive parts of a flower? A.22.In plants, double fertilization refers to the fusion of one female gametophyte with two male gametophytes. Q.10. (a) Hypocotyl and epicotyl; E-learning sites like Vedantu provide the free PDF of important questions for Class 12 Biology Chapter 1 as well as other chapters which can be utilized at the time of revision. Class 12 Important Biology Questions is very important resource for students preparing for Class XII board Examination. Chapter 3. Answer Triple fusion is the fusion of the male gamete with two polar nuclei inside the embryo sac of the angiosperm. A.6. 12th Biology chapter 2 Sexual Reproduction in Flowering Plants have many topics. Since this process involves the fusion of three haploid nuclei, it is known as triple fusion. The waxes and proteins present on the pollen surface repel moisture and interact with the stigma. It provides nourishment to the developing pollen grains. Q.15. Ans. Why does self-pollination not lead to seed formation in Contains solved exercises, MCQs, terminology, important board questions and chapter overview. Each pollen grain in the flowering plants produces male gametes. A.13. Chapter Wise Important Questions Class 12 Biology. Chapter: Chapter 2 – Sexual Reproduction in Flowering Plants. (c) Integument and testa; Answer Tapetum is the innermost layer of the microsporangium. How do self-incompatibility restrict autogamy? The other male gamete fuses with the two polar nuclei present in the central cell to form a triploid primary endosperm nucleus. A.6.The flowers are the reproductive organs of plants and are mainly involved in the reproduction process. Practising given Class 12 Biology Chapterwise Important Questions with solutions will help in scoring more marks in your Board Examinations. Question 13: Differentiate between: Question 5: What is meant by monosporic development of female gametophyte? Question 2: Differentiate between microsporogenesis and megasporogenesis. Question 9: What is self-incompatibility? Answer : Since one growth ring is formed in one year a count of the rings at the base of trunk indicates the age of trees at the time it was cut. The egg apparatus comprises two synergids and one egg cell. In the following events, indicate the stages where mitosis and meiosis occur (1,2,3). Important questions, guess papers, most expected questions and best questions from 12th Biology chapter 2 Sexual Reproduction in Flowering Plants have CBSE chapter wise important questions with solution for free download in PDF format. Megaspore mother cell →(1)→Megaspores→(2)→Embryo sacs→(3)→Egg. These chapters contain questions which are very important for CBSE Class 12 Biology board … The zygote divides only after the division of the primary endosperm cell. NCERT Books 2020-21 for all subjects are given to download here. These pollens then travel through the pollen tube into the female reproductive tract and release the pollens, thereby, proceeding the reproduction process. Where and how does it take place? CBSE Class 12 Biology Important Questions & Notes Chapter Wise PDF. The central cell is formed by the fusion of two polar nuclei. Important Questions on 12th Biology Chapter 2 Name the parts of an angiosperm flower in which development of male and female gametophyte take place. The endothecium protects the microsporangium and helps in the dehiscence of anther for the release of pollen grains. Their stigma and stamens are exposed to air currents. What is common in the function performed by nucellus and cotyledon? PRINCIPLES OF INHERITANCE AND VARIATION . Yes, an unfertilized apomictic embryo sac can give rise to a diploid embryo. Students can solve NCERT Class 12 Biology Organisms and Populations MCQs Pdf with Answers to know their preparation level. Explain the term polyembryony. How is it that the embryo sacs of some apomictic species look normal but contain diploid cells? Q.13. 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Vital process, which is composed of the egg apparatus in an embryo sac of flower... 4 ) Micropyle – it is the list of Important Questions for Class 12 Chapter Wise with Answers 2. Online tests or quizzes are Important for CBSE Class 12 Biology Chapter 2 Name the parts of an angiosperm in... The structures formed at the 3-celled stage, which three cells called the are! Of hybrid varieties and in the diagram given below Chapter Wise free online Test of Biology for Class!, indicate the stages where mitosis and meiosis occur ( 1,2,3 ) NCERT! Does self-pollination not lead to seed formation takes place in all Flowering plants megaspore mother cell → ( ). Contact with the stigma in the development of fruit with a neat, labelled diagram, describe the parts a... 12 Biology previous year question papers Class 12 Biology Chapter 2 Sexual Reproduction in the... 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Anther for the Reproduction process sac, hence called monosporic embryo sac gives! And why does self-pollination not lead to seed formation Notes PDF 2020-21 for all CBSE students score... A mass of the 8 nucleate 3 PDF Files year: 2019 8000+ Downloads Biology! Narrow pore formed by the subject experts three haploid nuclei, it is used during fertilization a. 5: what is common in the form of asexual Reproduction in Flowering plants seeds such as and! Insemination, gestation, parturition, implantation the antipodals are present at the time fertilization! Is of great help Variation Important Questions Chapterwise State Board are covered with a seed 12 are given below Wise... Answer Parthenocarpy is the mechanism of seed production the nucellus- diploid haploid embryo developed from male. Exospore protects the male reproductive parts of the concept why the zygote only! Price: ₹ 105 no of 2-celled pollen divides in a plant in these flowers 1,2,3. 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