Subject wise and topic wise. Important Questions for Class 12 Biology Chapter-2- Sexual Reproduction in Flowering Plants. This can be seen in a few citrus fruits and mango varieties. These pollens then travel through the pollen tube into the female reproductive tract and release the pollens, thereby, proceeding the reproduction process. , It’s very good Hybrid varieties of such plants and vegetables are being grown extensively. 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. Free PDF Download of CBSE Biology Multiple Choice Questions for Class 12 with Answers Chapter 2 Sexual Reproduction in Flowering Plants. When and why does a plant breeder employ this technique? A few aquatic plants have their flowers growing in the air. Furthermore, these previous year question papers completely eliminate the fear of exams from students. Subject wise and topic wise. 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 Important Questions on 12th Biology Chapter 2 Name the parts of an angiosperm flower in which development of male and female gametophyte take place. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. The endosperm provides food for the growing embryo and after the formation of the Arrange them sequentially according to how they appear in the artificial hybridization programme. 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. Q.23.What are the main layers of a flower? That is why the zygote divides only after the growth, food storage and division of the primary endosperm cell. The first mitotic division in the megaspore forms two nuclei. 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. Pollen grain, sporogenous tissue, microspore tetrad, pollen mother cell, male gametes A.5. Which type of cell division occurs during these events? Topics And Questions You Can’t Miss. This phenomenon is known as protogyny or protandry respectively. In this, the megaspore mother cell does not undergo meiosis. Define self-incompatibility. Class 12 Biology important questions. Is it possible that an unfertilized apomictic embryo sac gives rise to a diploid embryo? Class 12 Biology notes according to FBISE syllabus. 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. The central cell is formed by the fusion of two polar nuclei. 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. Q.7. Sexual reproduction in flowering plants involves an important phenomenon called pollination. A.6. Chapterswise Important questions of Biology for CBSE Class 12 Board exam 2019 are available here. 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. They possess no special odours or nectar. Out of the two male gametes, one gamete fuses with the nucleus of the egg cell and forms the zygote (syngamy). If the megaspore develops into an embryo sac without mitotic division, it will give rise to a diploid embryo. Fill in the missing words: Q.3. They are large with bright-coloured petals to attract insects. Subject: Biology To remove the anthers, the flowers are covered with a bag before they open. Question 4: With a neat, labelled diagram, describe the parts of a typical angiosperm ovule. The male reproductive parts of the flower include the stamen the filament and the anther, which are collectively termed the androecium. This is known as monosporic development of the female gametophyte. Can cross-pollination occur in cleistogamous flowers? What is common in the function performed by nucellus and cotyledon? This pollen keeps floating on the water surface until they are caught by female flowers. 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. Answer The correct development sequence is as follows: Answer The zygote is formed by the fusion of the male gamete with the nucleus of the egg cell. Chasmogamous flowers have exposed anthers and stigmata similar to the flowers of other species. 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. How is it exploited commercially? This video is unavailable. It is used for the commercial production of hybrid varieties and in the production of virus-free varieties. The below mentioned page consist of Important questions for CBSE class 12 Biology Chapter- 2 - Sexual Reproduction in Flowering Plants. Characteristics of wind-pollinated flowers: Characteristics of water-pollinated flowers: Characteristics of insect-pollinated flowers: Q.5. 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. On the other hand, megasporogenesis results in the formation of haploid megaspores from a diploid megaspore mother cell. The female gametophyte (embryo sac) develops from a single functional megaspore. Pollen mother cell → Pollen tetrad → Pollen grain → Vegetative cell, ___?____ A.10. (4) Micropyle – It is a narrow pore formed by the projection of integuments. It can easily understand Thank you for these questions, Your email address will not be published. of Files: 3 PDF Files Year : 2019 8000+ Downloads 12th Biology. Answer Fruits derived from the ovary and other accessory floral parts are called false fruits. Q.9. Q.1. Question 6: With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte. Answer Triple fusion is the fusion of the male gamete with two polar nuclei inside the embryo sac of the angiosperm. Answer There are two types of flowers present in plants namely Oxalis and Viola − chasmogamous and cleistogamous flowers. Yes, parthenocarpy is different from apomixis. A.17. (2) In some plants, the gynoecium matures before the androecium or vice-versa. A.7. In flowering plants apomixis is used to reproduce asexually through seeds. 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. The embryo sac is located inside the nucellus. 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. Chapter 3. A.2. The pollen grains are sticky and can easily stick to the insect’s body. With the help of the Class 12 Biology chapter solutions, learn about concepts such as megasporogenesis, microsporogenesis, self-pollination in flowers, etc. State the function of the male gametes. This process is called bagging. While studying the chapter or undergoing a quick recap before the exams the important questions of Biology Class 12 Chapter 5 … SEXUAL REPRODUCTION IN FLOWERING PLANTS . We have divided the questions according to chapters, and each questions is picked up from various sources, like . Name the nuclei involved in How is it that the embryo sacs of some apomictic species look normal but contain diploid cells? It results in the formation of the endosperm. 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. are produced using this technique. The embryos can develop directly from the nucellus or synergids. 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. In this, the anther and the stigma mature at different times so cannot come in contact with each other. Answer Self-pollination involves the transfer of pollen from the stamen to the pistil of the same flower. The waxes and proteins present on the pollen surface repel moisture and interact with the stigma. (6) Chalazal – It is the based swollen part of the nucellus from where the integuments originate. Question 3: Arrange the following terms in the correct developmental sequence: (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. Register online for Biology tuition on Vedantu.com to score more marks in CBSE board examination. This prevents the fusion of the gametes along with the development of the embryo. Q.15. Six out of the eight nuclei are surrounded by cell walls. In three-celled pollen, the generative cell divides into two gametes, therefore, no further division takes place in the pollen tube. Biology MCQ Questions for Class 12 with Answers Pdf […] 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. The various parts of an ovule are – (a) These embryos give rise to virus-free plantlets and are healthy. Triple fusion, leading to the fusion of one male gamete and two haploid polar nuclei form the triploid tissue. A.5. During microsporogenesis, the cells of tapetum produce various enzymes, hormones, amino acids, and other nutritious material required for the development of pollen grains. Explain the benefits of each. Discuss Your Questions Here and share your views with us through Discussion Forum. NCERT Book; Past Year Papers; Sample Papers . 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.1. 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. (a) Hypocotyl and epicotyl; Self-Pollination: Self-pollination occurs when both the anther and the stigma mature simultaneously and come in contact with each other. A.15. Very Short Answer Type Questions. Mention the kind of carpel in the diagram given below. A.6. Answer The female gametophyte or the embryo sac develops from a single functional megaspore. They are pollinated by the insects. Why is it that the generative cell of 2-celled pollen divides in a pollen tube and not of 3-celled pollen? (2) Hilum – It is the point where the body of the ovule is attached to the funiculus. The nucellus provides nutrition to the developing embryo. Answer Tapetum is the innermost layer of the microsporangium. It protects the reproductive organs of a plant. Therefore, the seedless varieties of economically important fruits such as orange, lemon, water melon etc. Now, if you have purchased the pdf file, then don’t let them go waste, do practice them. 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. In an apple, the fleshy receptacle forms the main edible part. These chapters contain questions which are very important for CBSE Class 12 Biology board … Show the direction of the pollen tube from the pollen on the stigma in the embryo sac in the given diagram. Each pollen grain in the flowering plants produces male gametes. This megaspore undergoes three successive mitotic divisions to form eight nucleate embryo sacs. Sporogenous tissue – pollen mother cell – microspore tetrad – Pollen grain – male gamete A.3. Chapter Wise Important Questions Class 12 Biology. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Answer An ovule is a female megasporangium where the formation of megaspores takes place. 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? Practising given Class 12 Biology Chapterwise Important Questions with solutions will help in scoring more marks in your Board Examinations. It is a complex process in all flowering plants. On maturity, the embryo sac of the angiosperms consists of 8 nuclei and 7 cells. (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. Megaspore mother cell →(1)→Megaspores→(2)→Embryo sacs→(3)→Egg. 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. So working out from Class 12 Worksheets is of great help. Give a reason in support of your answer. Helps in the development of fruit with a seed. CBSE class 12 biology question paper is part of CBSE previous year question papers. 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. 12th Biology chapter 2 Sexual Reproduction in Flowering Plants have many topics. Q.3. Free Download CBSE Class 12 Biology Important Questions in PDF format. Q.10. 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. It provides nourishment to the developing pollen grains. (1) Funiculus – It is a stalk-like structure which represents the point of attachment of the ovule to the placenta of the ovary. Biology MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. 12th Biology chapter 2 Sexual Reproduction in Flowering Plants have many topics. Watch Queue Queue. Just like humans, even plants have reproductive organs that help them to produce fruits. If you liked our NCERT Solutions for Class 12 Biology, please share this post. 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 13: Differentiate between: Cross-Pollination: This type of pollination occurs in self-incompatible plants. How does a chasmogamous bisexual flower prevent self-pollination? self-incompatible species? A.13. Chapter Wise Important Questions Class 12 Biology. It accommodates the sex organs of the plant. Meiosis occur ( 1,2,3 ) the direction of the same species or between of. Are extremely critical for all subjects are given to Download here the method of hybrid... 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