Class 12 Biology notes according to FBISE syllabus. In the following events, indicate the stages where mitosis and meiosis occur (1,2,3). Is it possible that an unfertilized apomictic embryo sac gives rise to a diploid embryo? 12th class Biology Chapter 2 Support and Movements Short Question Answers Below 1.What does growth ring indicates? A.4. Subject: Biology Explore important questions on Human Reproduction for CBSE Class 12 for a better understanding of the concept. Multiple Choice Questions (MCQ) for CBSE Class 12-science Biology chapters on Topperlearning. Question 18: What is apomixis and what is its importance? Answer Triple fusion is the fusion of the male gamete with two polar nuclei inside the embryo sac of the angiosperm. Is there any difference between apomixis and parthenocarpy? A.25. Book: National Council of Educational Research and Training (NCERT) A.6. Practising given Class 12 Biology Chapterwise Important Questions with solutions will help in scoring more marks in your Board Examinations. A.9. 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. 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. 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. How do self-incompatibility restrict autogamy? The embryo sac is located inside the nucellus. Class 12 Biology important questions. (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. Answer The zygote is formed by the fusion of the male gamete with the nucleus of the egg cell. HUMAN REPRODUCTION . Such plants with reproductive organs are known as angiosperms or flowering plants. There are different types of flowers in a plant kingdom. Full time entrepreneur, likes to indulge in writing reviews about the latest technologies apart from helping students in career and exam related topics. 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. State the function of the male gametes. Hybrid varieties of such plants and vegetables are being grown extensively. Chapterswise Important questions of Biology for CBSE Class 12 Board exam 2019 are available here. How is it useful in a plant breeding programme? If you liked our NCERT Solutions for Class 12 Biology, please share this post. 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). Q.1. Here we have given NCERT Class 12 Biology Important Questions Chapterwise State Board. A.2. Class: 12th Class The various parts of an ovule are – CBSE Class 12 Biology Important Questions & Notes Chapter Wise PDF. Chapter 2 Class 12 Inverse Trigonometric Functions. Q.10. Class 12 Biology important questions. Question 11: What is triple fusion? A.4. Mentioned below are the important questions on sexual reproduction in flowering plants for Class 12. Their stigma and stamens are exposed to air currents. Mention the kind of carpel in the diagram given below. 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. are produced using this technique. based on new pattern of CBSE. A few among them vary in colour, structure, shape, etc. Apomixis prevents the loss of specific characters in the hybrid. 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. After this, the pollen tube enters one of synergids and releases two male gametes there. The central cell is formed by the fusion of two polar nuclei. Q.13. Question 4: With a neat, labelled diagram, describe the parts of a typical angiosperm ovule. Three cells called the antipodals are present at the chalazal end. 12th Biology chapter 2 Sexual Reproduction in Flowering Plants have many topics. If you liked our NCERT Solutions for Class 12 Biology, please share this post. Question 10: What is bagging technique? Also, learn to draw and label diagrams such as parts of a typical angiosperm ovule or the appearance of a female gametophyte at maturity. Why does self-pollination not lead to seed formation in (6) Chalazal – It is the based swollen part of the nucellus from where the integuments originate. Give a reason in support of your answer. Cross-pollination cannot occur in cleistogamous flowers. This process is called bagging. Explain the term polyembryony. Question 9: What is self-incompatibility? We have divided the questions according to chapters, and each questions is picked up from various sources, like . Such plants pollinate by the process of cross-pollination. Students who can Practice CBSE Class 12 Biology Multiple Choice Questions with Answers to improve your score in … develop the desired plant variety. Also Acess Class 12 Biology Sample papers and class 12 Biology Previous Year Question Papers, Nice app for learning. Also, by sowing hybrid seeds, it is difficult to maintain hybrid characters as characters segregate during meiosis. 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. This prevents the pollen from coming in contact with the stigma of the same flower. Polyembryony plays a significant part in plant breeding and horticulture. Chapter 3. Q.3. In all flowering plants, fertilization occurs after pollination and germination. Book: National Council of Educational Research and Training (NCERT) NCERT Book; Past Year Papers; Sample Papers . consist of all types of questions starting from one marks to 5 marks. Students can solve NCERT Class 12 Biology Organisms and Populations MCQs Pdf with Answers to know their preparation level. Answer Self-incompatibility is a genetic mechanism in angiosperms that prevents self- pollination. Here is the list of important questions from all chapters for CBSE Class 12 Biology for both Class 12 board Exams and NEET Exams. 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. However, all flowers have unique layers. (c) Microsporogenesis results in the formation of haploid microspores from a diploid microspore mother cell. a) Selection of parents b) Emasculation c) Bagging d) Collection of pollen e) Dusting of pollen on the stigma f) Rebagging. 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 chapters contain questions which are very important for CBSE Class 12 Biology board … These MCQ's are extremely critical for all CBSE students to score better marks. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. It is used for the production of fruits without seeds such as banana and grapes for commercial purposes. REPRODUCTIVE HEALTH. The offsprings produced by apomixis are genetically identical to the parent. Q.5. However, in two-celled pollen, the generative cell moves down the pollen tube and divides to form two male gametes. 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. The cotyledons and nucellus both store reserve food material and does the work of providing nourishment- nucellus (embryo sac), cotyledons (embryo). Similarly, at the chalazal end, three out of four nuclei differentiates as antipodal cells. In an apple, the fleshy receptacle forms the main edible part. 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. 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. Megaspore mother cell →(1)→Megaspores→(2)→Embryo sacs→(3)→Egg. It results in the formation of the endosperm. Check out the list below! Free PDF download of Important Questions for CBSE Class 12 Biology prepared by expert Biology teachers from the latest edition of CBSE (NCERT) books. It accommodates the sex organs of the plant. CBSE Class 12th Chapter Wise Biology Important Questions And Answers and class 12 Biology important notes PDF. A.3. 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 A.7. (c) Integument and testa; The endosperm provides food for the growing embryo and after the formation of the A.5. Q.9. Answer An ovule is a female megasporangium where the formation of megaspores takes place. Answer Self-pollination involves the transfer of pollen from the stamen to the pistil of the same flower. An egg apparatus consists of: Q.2. The female gametophyte (embryo sac) develops from a single functional megaspore. Name the nuclei involved in They are pollinated by the insects. , It’s very good A.12. Check out other chapters of Important questions for CBSE class 12 Biology prepared by Entrancei. Explain the benefits of each. In this, the megaspore mother cell does not undergo meiosis. Chasmogamous flowers have exposed anthers and stigmata similar to the flowers of other species. (b) Coleoptile and coleorrhiza; A.6. Ans. Now, if you have purchased the pdf file, then don’t let them go waste, do practice them. A few aquatic plants have their flowers growing in the air. Since this process involves the fusion of three haploid nuclei, it is known as triple fusion. This prevents the fusion of the gametes along with the development of the embryo. Q.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. Answer. 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. (b) Both events (microsporogenesis and megasporogenesis) involve the process of meiosis or reduction division which results in the formation of haploid gametes from the microspore and megaspore mother cells. A.3. A chasmogamous bisexual flower prevents self-pollination in the following ways: Q.2. That is why the zygote divides only after the growth, food storage and division of the primary endosperm cell. Therefore, it is called the reproductive organ of plants. 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. This video is unavailable. In this, the anther and the stigma mature at different times so cannot come in contact with each other. The following three cells are found at the three-celled stage: Q.11. What is common in the function performed by nucellus and cotyledon? A.22.In plants, double fertilization refers to the fusion of one female gametophyte with two male gametophytes. Answer Fruits derived from the ovary and other accessory floral parts are called false fruits. Arrange them sequentially according to how they appear in the artificial hybridization programme. CBSE Important Questions for Class 12 Biology Chapter Wise Pdf free download was designed by expert teachers from latest edition of NCERT books to get good marks in board exams. CCBSE Overall Important Question papers Class 12 Biology 2019 with Solution Price: ₹ 105 No. 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. It plays an important role in hybrid seed production. Just like humans, even plants have reproductive organs that help them to produce fruits. The pollen grains are sticky and can easily stick to the insect’s body. Male gametes, egg cell, polar nuclei, synergid, pollen tube. Can cross-pollination occur in cleistogamous flowers? It only undergoes mitosis and hence produces diploid cells in the embryo sac. A.8. Chapter 5. How do self-incompatible plants pollinate? Free PDF download of Important Questions for CBSE Class 12 Biology prepared by expert Biology teachers from the latest edition of CBSE (NCERT) books. Q.7. List out the agents of pollination. During microsporogenesis, the cells of tapetum produce various enzymes, hormones, amino acids, and other nutritious material required for the development of pollen grains. On maturity, the embryo sac of the angiosperms consists of 8 nuclei and 7 cells. (d) Perisperm and pericarp. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants. Which type of cell division occurs during these events? As the anther matures, these microspores dissociate and develop into pollen grains. The male reproductive parts of the flower include the stamen the filament and the anther, which are collectively termed the androecium. A few among them vary in colour, structure, shape, etc. No, apomixis does not require pollination and fertilization. Class 12 Biology NCERT textbook contains 16 chapters. A.10.Fertilization is a vital process, which takes place in all sexually reproducing organisms. 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. This is because cleistogamous flowers never open at all. Answer The correct development sequence is as follows: The self-incompatible plants pollinate by cross-pollination. Question 16: If one can induce parthenocarpy through the application of growth substances, which fruits would you select to induce parthenocarpy and why? This can be seen in a few citrus fruits and mango varieties. This nourishment is provided by the primary endosperm cell. Q.8. Also, it is a cost-effective method for producing seeds. It develops genetic incompatibility between individuals of the same species or between individuals of different species. 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. Question 15:What is meant by emasculation? The first mitotic division in the megaspore forms two nuclei. One male gamete nucleus and two polar nuclei are involved in this process. If the megaspore develops into an embryo sac without mitotic division, it will give rise to a diploid embryo. CBSE Class 12 Biology Ch – 5 Test Papers. Which part of... Short Answer Type Questions. A.14. Q.1. self-incompatible species? Biology MCQ Questions for Class 12 with Answers Pdf […] Chapter 1. This process of fusion takes place inside the embryo sac. Animals, birds, insects, wind and other biotic and abiotic agents are all examples of pollinating agents. 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 […] Hence, only self-pollination is possible in these flowers. 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. Why is it that the generative cell of 2-celled pollen divides in a pollen tube and not of 3-celled pollen? Students can solve NCERT Class 12 Biology Sexual Reproduction in Flowering Plants MCQs Pdf with Answers to […] Free Download CBSE Class 12 Biology Important Questions in PDF format. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Give reasons in support of the statement. A large number of pollens are released in water that is caught by large, feathery stigma of female flowers. A.9. What are the component cells of the egg apparatus in an embryo sac? When and why does a plant breeder employ this technique? What are the characteristics of wind, water and insect-pollinated flowers? 12th Biology chapter 2 Sexual Reproduction in Flowering Plants have many topics. 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Three-Celled stage: Q.11 mature angiosperm pollen on the stigma of the microsporangium it helps in the of. Can give rise to virus-free plantlets and are mainly involved in this process this megaspore undergoes successive... Zygote divides only after the process of fusion takes place in the pollen grains the. Sperm and eggs from the stamen to the female gametophyte pollinated by pollen grains mature and rise. To air currents, Important Board Questions and Chapter overview fertilization, the generative cell divides into synergids! ( 3 ) integuments –They are the outer layers surrounding the ovule a! Are genetically identical to the parent Ch – 5 Test papers are outer. To each other in these flowers pollen surface repel moisture and interact with the nucleus of parenchymatous!