Which part(s) of the flower forms the fruit? (d) Perisperm and pericarp. On maturity, the embryo sac of the angiosperms consists of 8 nuclei and 7 cells. Q.4. 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? Biology has the vastest syllabus in all of the science stream and this is one of the reasons why it is difficult for most of the students. Explain the pollination occurring in the chasmogamous flowers. 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. A.20.A flower plays a vital role in the reproduction process of a plant. Check out the list below! Here is the list of important questions from all chapters for CBSE Class 12 Biology for both Class 12 board Exams and NEET Exams. Hybrid varieties of such plants and vegetables are being grown extensively. Characteristics of wind-pollinated flowers: Characteristics of water-pollinated flowers: Characteristics of insect-pollinated flowers: Q.5. The exospore protects the male genetic material during transportation from an anther to stigma. Why is it that the generative cell of 2-celled pollen divides in a pollen tube and not of 3-celled pollen? If the megaspore develops into an embryo sac without mitotic division, it will give rise to a diploid embryo. REPRODUCTION IN ORGANISMS Chapter 2. unwanted pollen grains. This takes place in the megaspore mother cell. How is it useful in a plant breeding programme? The remaining two cells (of the micropylar and the chalazal end) move towards the centre and are known as the polar nuclei, which are situated in a large central cell. Biology Notes for Class 12 CBSE Board Download pdf . CBSE Class 12 Biology Ch – 5 Test Papers. After this, the pollen tube enters one of synergids and releases two male gametes there. A.3. A.8. If you liked our NCERT Solutions for Class 12 Biology, please share this post. Question 13: Differentiate between: CBSE Class 12 Biology Important Questions & Notes Chapter Wise PDF. Q.5. A.6. Which part of... Short Answer Type Questions. State the function of the male gametes. Chapter 1 Class 12 Relation and Functions. Apomixis prevents the loss of specific characters in the hybrid. In these flowers two types of pollinations take place: What are the component cells of the egg apparatus in an embryo sac? It is a complex process in all flowering plants. Arrange them sequentially according to how they appear in the artificial hybridization programme. Question 2: Differentiate between microsporogenesis and megasporogenesis. They possess no special odours or nectar. It is a double-walled structure with a thin inner wall known as endospore composed of cellulose and a thick outer wall known as exospore, composed of sporopollenin. 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. Q.17. A.6. When and why does a plant breeder employ this technique? A.10. 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.3. Mentioned below are the important questions on sexual reproduction in flowering plants for Class 12. A.7. In most flowering plants, a single megaspore mother cell present at the micropylar pole of the nucellus region of the ovule undergoes meiosis to produce four haploid megaspores. Chasmogamous flowers have exposed anthers and stigmata similar to the flowers of other species. Class 12 Biology important questions. A.1. Answer. Class 12 Biology Important Questions-In this article we will provide you ten important Biology questions, which will help you in your class 12 board exams and other entrance exams.Class 12 Important Biology Questions. Important Questions on 12th Biology Chapter 2 Name the parts of an angiosperm flower in which development of male and female gametophyte take place. Generative cell, Q.5. A large number of pollens are released in water that is caught by large, feathery stigma of female flowers. Chapter Wise Important Questions Class 12 Biology. Where and how does it take place? Question 3: Arrange the following terms in the correct developmental sequence: 12th Biology chapter 2 Sexual Reproduction in Flowering Plants have many topics. Question 16: If one can induce parthenocarpy through the application of growth substances, which fruits would you select to induce parthenocarpy and why? This video is unavailable. (4) Micropyle – It is a narrow pore formed by the projection of integuments. Subject wise and topic wise. 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. Explain the structure of the pollen. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Show the direction of the pollen tube from the pollen on the stigma in the embryo sac in the given diagram. A.8. Answer The male gametophyte or the pollen grain develops inside the pollen chamber of the anther, whereas the female gametophyte (also known as the embryo sac) develops inside the nucellus of the ovule from the functional megaspore. (c) Microsporogenesis results in the formation of haploid microspores from a diploid microspore mother cell. Q.23.What are the main layers of a flower? This can be seen in a few citrus fruits and mango varieties. How does a chasmogamous bisexual flower prevent self-pollination? Chapter 4. This phenomenon is known as protogyny or protandry respectively. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants. Pollen mother cell → Pollen tetrad → Pollen grain → Vegetative cell, ___?____ In flowering plants apomixis is used to reproduce asexually through seeds. Pollination is the sexual mode of reproducing, which is carried out by all flowering plants of a plant kingdom. based on new pattern of CBSE. Here we have given NCERT Class 12 Biology Important Questions Chapterwise State Board. Book: National Council of Educational Research and Training (NCERT) It plays an important role in hybrid seed production. It also produces the exine layer of the pollen grains, which is composed of the sporopollenin. A few among them vary in colour, structure, shape, etc. If you liked our NCERT Solutions for Class 12 Biology, please share this post. A.11. Answers of all CBSE Class 12 Biology MCQs Multiple Choice Questions with Answers provided here with detailed solutions so that you can easily understand the logic behind each answer. There are different types of flowers in a plant kingdom. Book: National Council of Educational Research and Training (NCERT) So working out from Class 12 Worksheets is of great help. Answer An ovule is a female megasporangium where the formation of megaspores takes place. CBSE Class 12th Chapter Wise Biology Important Questions And Answers and class 12 Biology important notes PDF. Question 10: What is bagging technique? Yes, parthenocarpy is different from apomixis. A.4. It can easily understand The nucellus provides nutrition to the developing embryo. (c) Integument and testa; Give reasons in support of the statement. Ans. The chasmogamous flowers are open with their anther and stigma exposed for pollination. Students who can Practice CBSE Class 12 Biology Multiple Choice Questions with Answers to improve your score in Board Exams. These varieties thus obtained are highly productive. Answer Parthenocarpy is the process of developing fruits without involving the process of fertilization or seed formation. We hope that our NCERT Solutions for 12 Biology helped with your studies! Give reasons in support of your answer. Students who can Practice CBSE Class 12 Biology Multiple Choice Questions with Answers to improve your score in … Question 15:What is meant by emasculation? The other male gamete fuses with the two polar nuclei present in the central cell to form a triploid primary endosperm nucleus. Class 12 Important Biology Questions is very important resource for students preparing for Class XII board Examination. They are large with bright-coloured petals to attract insects. A.12. A.15. Practising given Class 12 Biology Chapterwise Important Questions with solutions will help in scoring more marks in your Board Examinations. What are the component cells of the egg apparatus in an embryo sac? 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. Stigma. No, apomixis does not require pollination and fertilization. Similarly, at the chalazal end, three out of four nuclei differentiates as antipodal cells. Class 12 Biology notes according to FBISE syllabus. Six out of the eight nuclei are surrounded by cell walls. A.2. The flowers have nectar and a pleasant fragrance. CBSE previous year question papers help in improving the performance of students during exams. What are the characteristics of wind, water and insect-pollinated flowers? The cotyledons and nucellus both store reserve food material and does the work of providing nourishment- nucellus (embryo sac), cotyledons (embryo). A chasmogamous bisexual flower prevents self-pollination in the following ways: Q.2. Thus, incompatibility prevents breeding. Self-Pollination: Self-pollination occurs when both the anther and the stigma mature simultaneously and come in contact with each other. Answer Self-pollination involves the transfer of pollen from the stamen to the pistil of the same flower. SEXUAL REPRODUCTION IN FLOWERING PLANTS . This prevents the fusion of the gametes along with the development of the embryo. Q.10. Is it possible that an unfertilized apomictic embryo sac gives rise to a diploid embryo? How do self-incompatibility restrict autogamy? Which is a triploid tissue? One male gamete nucleus and two polar nuclei are involved in this process. These MCQ's are extremely critical for all CBSE students to score better marks. A few among them vary in colour, structure, shape, etc. The answers are also provided for reference. The egg apparatus comprises two synergids and one egg cell. In three-celled pollen, the generative cell divides into two gametes, therefore, no further division takes place in the pollen tube. Cross-pollination is of two types: Q.2. Answer It results in the formation of the endosperm. Q.14. The cell walls of the 8 nucleate stage are organized in the form of a female gametophyte or embryo sac. Q.3. How is the condition achieved in a fertilized ovule? Subject: Biology Question 18: What is apomixis and what is its importance? Q.8. Can cross-pollination occur in cleistogamous flowers? A.7. Chapter … The endosperm is a triploid tissue in a fertilized ovule. Later, the mature, viable, and stored pollen grains are dusted on the bagged stigma by breeders to allow artificial pollination to take place and obtain the desired plant variety. Answer The correct development sequence is as follows: Also, by sowing hybrid seeds, it is difficult to maintain hybrid characters as characters segregate during meiosis. While studying the chapter or undergoing a quick recap before the exams the important questions of Biology Class 12 Chapter 5 … Q.3. CBSE Class 12 Biology Chapter Wise Important Questions Educational Technology 8 Jun 2017 - 07:09 In this article, you can find Class 12 Biology important questions. Hence, at maturity, the female gametophyte appears as a 7-celled structure, though it has 8 nucleate. Free PDF download of Important Questions with Answers for CBSE Class 12 Biology Chapter 2 - Sexual Reproduction in Flowering Plants prepared by expert Biology teachers from latest edition of CBSE(NCERT) books. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs. 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. We have divided the questions according to chapters, and each questions is picked up from various sources, like . Now, if you have purchased the pdf file, then don’t let them go waste, do practice them. 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. (b) Coleoptile and coleorrhiza; In the following events, indicate the stages where mitosis and meiosis occur (1,2,3). Watch Queue Queue. Biology MCQs for Class 12 Chapter Wise with Answers PDF Free Download is very important for students who want to score good marks in their CBSE board examination. (6) Chalazal – It is the based swollen part of the nucellus from where the integuments originate. This technique is an important part of the plant breeding programme as it ensures that pollen grains of only desirable plants are used for fertilization of the stigma to Register online for Biology tuition on Vedantu.com to score more marks in CBSE board examination. 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. Their stigma and stamens are exposed to air currents. Q.10.Explain the events which occur after the process of fertilization in plants. As the anther matures, these microspores dissociate and develop into pollen grains. A.10.Fertilization is a vital process, which takes place in all sexually reproducing organisms. (a) A single megaspore gives rise to the embryo sac, hence called monosporic embryo sac. The pollen is smooth, light can be blown easily by wind and are in large numbers. Free PDF download of Important Questions for CBSE Class 12 Biology prepared by expert Biology teachers from the latest edition of CBSE (NCERT) books. 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. Revise topics such as bagging technique, triple fusion, perisperm, epicotyl, integument, testa, hypocotyl, emasculation, apomixis, and more. The pollinating agents are involved in transferring pollen grains from the male to the female part of the flower. Important Questions for CBSE Class 12 Biology, Chapter ... Practising given Class 12 Biology Chapterwise Important Questions with solutions will help in scoring more marks in your Board Examinations. Answer There are two types of flowers present in plants namely Oxalis and Viola − chasmogamous and cleistogamous flowers. During fertilization, a pollen tube grows into one of the synergids. 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. Define self-incompatibility. The important questions are selected by experts to cover all the important topics of the chapters. Mention the kind of carpel in the diagram given below. This technique involves inducing fruit formation by the application of plant growth hormones such as auxins. The following three cells are found at the three-celled stage: Q.11. CBSE class 12 biology question paper is part of CBSE previous year question papers. Describe the structure of the embryo sac of a mature angiosperm. 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. Answer The female gametophyte or the embryo sac develops from a single functional megaspore. 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. Question 11: What is triple fusion? Hence, only self-pollination is possible in these flowers. Chapter 1. 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.7. 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. The pollen grains mature and give rise to male gametes. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Q.7. 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. In a few species, the diploid egg cell does not undergo reduction division and forms an embryo without fertilization. How does pollination occur in such plants? The first mitotic division in the megaspore forms two nuclei. Chapter 5. Flowers provide nectar to certain birds and insects. The endosperm provides food for the growing embryo and after the formation of the Furthermore, these previous year question papers completely eliminate the fear of exams from students. Such plants with reproductive organs are known as angiosperms or flowering plants. Biology Class 12 Important Questions are very helpful to score high marks in board exams.Here we have covered Important Questions on all topics for Class 12 Biology subject. The self-incompatible plants pollinate by cross-pollination. Important Questions for Class 12 Biology Chapter-2- Sexual Reproduction in Flowering Plants. (2) In some plants, the gynoecium matures before the androecium or vice-versa. Also Acess Class 12 Biology Sample papers and class 12 Biology Previous Year Question Papers, Nice app for learning. This ensures that the flower is pollinated by pollen grains obtained from desirable varieties only. As a result, there are four nuclei each at both the ends i.e., at the micropylar and the chalazal end in the embryo sac. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants. These pollens then travel through the pollen tube into the female reproductive tract and release the pollens, thereby, proceeding the reproduction process. The Class 12 Biology Chapter 5 Principles of Inheritance and Variation Important Questions by Vedantu have been handpicked by the subject experts. Class 12 Biology NCERT textbook contains 16 chapters. Helps in the development of fruit with a seed. Explore important questions on Human Reproduction for CBSE Class 12 for a better understanding of the concept. The female reproductive parts of the flower include carpels, pistils, stigma, style and an ovary, which are collectively termed the gynoecium. ☞ Class 12 Solved Question paper 2020 ☞ Class 10 Solved Question paper 2020. The endothecium protects the microsporangium and helps in the dehiscence of anther for the release of pollen grains. 12th class Biology Chapter 2 Support and Movements Short Question Answers Below 1.What does growth ring indicates? Which type of cell division occurs during these events? The pollen grains are sticky and can easily stick to the insect’s body. Does apomixis require fertilization and pollination? Animals, birds, insects, wind and other biotic and abiotic agents are all examples of pollinating agents. The embryos can develop directly from the nucellus or synergids. Q.19.What are the stages of post-fertilization in plants? CCBSE Overall Important Question papers Class 12 Biology 2019 with Solution Price: ₹ 105 No. Important Questions for Class 12 Biology Chapter 5 It develops genetic incompatibility between individuals of the same species or between individuals of different species. Also, learn to draw and label diagrams such as parts of a typical angiosperm ovule or the appearance of a female gametophyte at maturity. Question 8: Mention two strategies evolved to prevent self-pollination in flowers. consist of all types of questions starting from one marks to 5 marks. Incompatibility may be between individuals of the same species or between individuals of different species. are produced using this technique. Get here NCERT Solutions for Class 12 Biology Chapter 2. A.9. Q.12. A.1. This is because cleistogamous flowers never open at all. Chapter 2 Class 12 Inverse Trigonometric Functions. Very Short Answer Type Questions. Self-incompatibility restricts autogamy by a mechanism known as self-sterility. Chapter Wise Important Questions Class 12 Biology. To remove the anthers, the flowers are covered with a bag before they open. Then, these nuclei divide at their respective ends and re-divide to form eight nucleate stages. Give a reason in support of your answer. 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, KVPY 2020 – Kishore Vaigyanik Protsahan Yojana Admit Card (Out), Exam Date, Syllabus, Exam Pattern, IARCS Olympiads: Indian Association for Research in Computing Science, MP Board Question Paper Class 12th 2020 for Travel and Tourism, MP Board Question Paper Class 12th 2020 for Retail, NCERT Solutions Class 12 Biology Chapter 3 - Human Reproduction. The questions in these free online tests or quizzes are important for CBSE Class 12 Biology Board Exam as well as Medical Entrance Exams. Embryo developed from the synergid- haploid Embryo developed from the nucellus- diploid. Register online for Biology tuition on Vedantu.com to score more marks in CBSE board examination. Full time entrepreneur, likes to indulge in writing reviews about the latest technologies apart from helping students in career and exam related topics. Biology MCQ Questions for Class 12 with Answers Pdf […] 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. Learn More. During the development of microsporangium, each cell of the sporogenous tissue acts as a pollen mother cell and gives rise to a microspore tetrad, containing four haploid microspores by the process of meiosis (microsporogenesis). Why does self-pollination not lead to seed formation in In an apple, the fleshy receptacle forms the main edible part. Flowers also promote the union of sperm and eggs from the same flower or different flowers. As a result, no seed formation takes place. This process is called bagging. This type of pollination makes use of both biotic and abiotic agents like wind, water, insects, birds, animals, and other agents as pollinators. endosperm, further development of the embryo from the zygote starts. Three cells called the antipodals are present at the chalazal end. A.1. On the other hand, megasporogenesis results in the formation of haploid megaspores from a diploid megaspore mother cell. A.2. This prevents the pollen from coming in contact with the stigma of the same flower. Subject wise and topic wise. It only undergoes mitosis and hence produces diploid cells in the embryo sac. 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. A.2. PRINCIPLES OF INHERITANCE AND VARIATION . Students can solve NCERT Class 12 Biology Sexual Reproduction in Flowering Plants MCQs Pdf with Answers to […] Q.13. Download free printable worksheets for CBSE Class 12 Biology with important topic wise questions, students must practice the NCERT Class 12 Biology worksheets, question banks, workbooks and exercises with solutions which will help them in revision of important concepts Class 12 Biology. Answer Apomixis is the mechanism of seed production without involving the process of meiosis and syngamy. 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. Chapter 3. Fill in the missing words: A.18.Pollination is a process of transferring pollen grains from the male anther of a flower to the flower’s female part called the stigma. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. 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. Class 12 Biology important questions. Practising given Class 12 Biology Chapterwise Important Questions with solutions will help in scoring more marks in your Board Examinations. In parthenocarpy, the fruit is produced without the fertilization of the female gamete. Also, the anther and the stigma lie close to each other in these flowers. Class XII Biology Chapter 2 Sexual Reproduction in Flowering Plants. Q.3. How do aquatic plants undergo pollination? It provides nourishment to the developing pollen grains. Free Download CBSE Class 12 Biology Important Questions in PDF format. Involved in the union of male and female gametes. (1) In certain plants, the stigma of the flower hasthecapability to prevent the germination of pollen grains and hence, prevent the growth of the pollen tube.It is a genetic mechanism to prevent self-pollination called self- incompatibility. It helps in pollination by attracting insects and other animals prior to transfer pollen grains. Warning: do not use these pdf’s on your personal or commercial blog or website. Yes, an unfertilized apomictic embryo sac can give rise to a diploid embryo. The waxes and proteins present on the pollen surface repel moisture and interact with the stigma. The ovary develops into a fruit. 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. They are pollinated by the insects. Teachoo has listed all the important questions for your Class 12 Board Exams. Q.9. A.13. An egg apparatus consists of: Q.2. Class: 12th Class Multiple Choice Questions (MCQ) for CBSE Class 12-science Biology chapters on Topperlearning. List the following events observed in human reproduction in chronological order. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 13 Organisms and Populations. This is because apomixis is a form of asexual reproduction in which the female reproductive apparatus is used. Question 5: What is meant by monosporic development of female gametophyte?