NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants
NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants: The myriads of flowers that we enjoy gazing at, the scents and the perfumes that we swoon over, the rich colours that attract us, are all there as an aid to sexual reproduction in flowering plants. In the solutions for NCERT class 12 biology chapter 2 sexual reproduction in flowering plants, you will get solutions to the questions related to the male and female reproductive systems, as in the flower, androecium consisting of stamens represents the male reproductive organs, and gynoecium consisting of pistils represents the female reproductive organs.
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In ch 2 bio class 12 ncert solutions, you will get solutions related to those topics which you have already learnt in this chapter. If you are looking for the answers of any other class from 6-12 then NCERT solutions are there for you. The solutions provided in the NCERT Solutions for Class 12 are provided by subject matter experts, and the students can refer to these for their board exam preparation.
Also read,
- NCERT Exemplar Class 12 Biology Solutions Chapter 2 Sexual Reproduction in Flowering Plants
- NCERT Notes for class 12 biology chapter 2 Sexual Reproduction in Flowering Plants
NCERT solutions for class 12 biology chapter 2 Sexual Reproduction in Flowering Plants: Solved Excercise Question
Answer:
In an angiosperm plant, the development of a male gametophyte occurs in the pollen chamber while that of female gametophyte takes place in nucellus.
Answer:
Differences between microsporogenesis and megasporogenesis are as follows:
Microsporogenesis | Megasporogenesis |
The process of formation of a functional haploid microspore is called microsporogenesis. | The process of formation of a functional haploid microspore is called megasporogenesis. |
Microsporogenesis takes place in pollen sac of the anther | Megasporogenesis takes place inside the ovule |
Four functional microspores are formed as a result of microsporogenesis | Only one functional megaspore is formed as a result of megasporogenesis, the other three gets degenerated |
The four micropores produced as a result of microsporogenesis, are arranged in a tetrad | The four micropores produced as a result of megasporogenesis, are arranged linearly |
During microsporogenesis and megasporogenesis, meiosis occurs and results into formation of four microspores and megaspores respectively, Later, mitosis occurs to give rise to microgametophyte and megagametophyte.
At the end of microsporogenesis, four functional haploid microspores are formed whereas at the end of megasporogenesis, four megaspores are formed out of which three degenerates and only one functional megaspore remains.
Answer:
The correct developmental sequence is as follows:
Sporogenous tissue Pollen mother cell
Microspore tetrad
Pollen grain
male gametes
Q4. With a neat, labelled diagram, describe the parts of a typical angiosperm ovule.
Answer:
The diagram of a typical angiosperm ovule is as follows:
An ovule consists of funicle, micropyle, integuments, nucellus, embryo sac, hilum, chalaza etc.
- Funicle - It is the stalk of ovule which connects ovule to the placenta. Funicle is short and multicellular.
- Hilum - It is the point where funicle connects the main body of the ovule.
- Integuments - These are the layers that surround the ovule. There can be outer integument and inner integument. The main function of integuments is to protect the inner tissues.
- Micropyle - The opening which is present at the top of integuments is called micropyle. The main function of micropyle is to allow the entry of the pollen tube into the ovule.
- Nucellus - Integuments surround parenchymatous tissue which constitutes the main body of the ovule and is called nucellus. The primary function of nucellus is to provide nutrition to the developing embryo.
- Chalaza - The swollen part of ovule present opposite to micropyle is called chalaza.
- Embryo sac - It is present in the nucellus and it contains female gamete called egg.
Q5. What is meant by monosporic development of female gametophyte?
Answer:
The female gametophyte of flowers develops from a single functional megaspore after continuous mitotic divisions. This type of development of female gametophyte from a single uninucleate megaspore is called monosporic development of female gametophyte.
Q6. With a neat diagram explain the 7-celled, 8-nucleate nature of the female gametophyte.
Answer:
The diagram of 7- celled 8- nucleate embryo sac of plants is as follows:
The female gametophyte of plants is formed from a single functional megaspore with the help of four unequal mitotic divisions. These mitotic divisions give rise to 8 nuclei. Later, these nuclei assemble into 7 cells. To both chalazal and micropylar end three cells each move. The three cells at chalaza are called antipodal cells while those at micropylar end constitute egg apparatus. The egg apparatus includes two larger cells called synergid while the egg is the smallest cell that acts as a female gamete.
Two nuclei migrate to the centre and together they form a single cell called the central cell. This central cell consists of two nuclei called polar nuclei. Thus, the mature embryo sac possesses 7 cells ( 3 antipodal cells, 2 synergid cells, 1 egg cell and 1 central cell) and 8 nuclei ( 3 of antipodal cell, 2 of synergid cells, 1 of egg cell and 2 of central cell).
Answer:
Flowers can be of two types i.e. chasmogamous flowers or cleistogamous flowers. Chasmogamous flowers are open flowers which have their anthers and stigma exposed. These flowers facilitate cross-pollination. On the other hand, cleistogamous flowers are closed flowers whose anthers and stigmas are not exposed. Since these flowers do not open at all, only self-pollination occurs in these and cross-pollination is never seen. Thus. cross-pollination cannot occur in cleistogamous flowers.
NCERT solutions for class 12 biology chapter 2 sexual reproduction in flowering plants:
Q8. Mention two strategies evolved to prevent self-pollination in flowers.
Answer:
Self-pollination refers to the transfer of pollen grains from the anther of a flower to the stigma of the same flower. Continuous self-pollination can reduce the variations in the progeny and cause a reduction in the vigour and vitality. Thus, plants have developed certain mechanisms to avoid self-pollination and ensure cross-pollination. The two of these mechanisms to prevent self-pollination are as follows:
- Self sterility or self-incompatibility - In this mechanism, the pollen grains of a flower do not germinate on the stigma of the same flower. This occurs due to the presence of some self-sterile genes. This mechanism is genetic.
- Dichogamy- In this method, the timing of maturation of anthers and stigmas of a bisexual flower is different so as to prevent self-pollination.
Protandry- Anthers mature earlier than the stigma of the same flower. So, even if the pollens fall on these stigmas, they are unable to germinate. E.g. sunflower, Salvia.
Protogyny- Stigmas mature earlier than anthers and get pollinated by mature pollen grains of other flowers. E.g. Mirabilis jalapa.
Answer:
Self-incompatibility refers to the genetic inability of fully functional pollen grains and ovules to produce viable seeds. This is mainly due to the presence of S or self genes. If these genes are present in pollen as well as ovule, they will not be able to produce viable seeds. Self-pollination does not lead to the formation of seeds in self-incompatible species due to the presence of certain chemical substances that block the germination of pollen grains on stigma and also obstruct their passage to the ovary.
Q10. What is bagging technique? How is it useful in a plant breeding programme?
Answer:
Bagging technique - Bagging refers to covering of emasculated flowers with the help of butter paper or plastic bags to avoid contamination of stigma of these flowers to undesired pollens.
This technique is used during artificial hybridisation experiments. This technique is useful in breeding programmes because it prevents contamination of stigma with unwanted pollens. So, through this technique, we can allow the breeding of species according to our need and obtain superior species.
Q11. What is triple fusion? Where and how does it take place? Name the nuclei involved in triple fusion.
Answer:
A pollen grain produces two male gametes. Out of these, one male gamete fuses with the egg cell and produces a zygote. The second male gamete fuses with the two polar nuclei of the central cell to produce primary endosperm nucleus. Since this fusion includes three haploid nuclei, it is called triple fusion.
The process of triple fusion occurs in the central cell of embryo sac. The pollen tube delivers one nucleus to the egg cell while the other one migrates to centre and fuses polar nuclei.
In triple fusion, two polar nuclei and one male gamete are involved.
Q12. Why do you think the zygote is dormant for sometime in a fertilised ovule?
Answer:
The zygote starts developing into an embryo only when a certain amount of endosperm has developed. This is because endosperm provides nourishment to the developing embryo. Thus, a zygote remains dormant in a fertilised ovule till the endosperm has developed.
Q13(a). Differentiate between:
(a) hypocotyl and epicotyl
Answer:
The differences between hypocotyl and epicotyl are as follows:
Hypocotyl | Epicotyl |
This is the portion of the embryo present below the cotyledon. | This is the portion of embryo present above the cotyledon. |
Hypocotyl ends into radicle | Epicotyl ends into plumule |
Q13(b) . Differentiate between:
(b) coleoptile and coleorrhiza
Answer:
The differences between coleoptile and coleorrhiza are as follows:
Coleoptile | Coleorrhiza |
Coleoptile refers to the protective covering that surrounds plumule | Coleorrhiza is the sheath that surrounds the radicle and root cap |
This sheath can come out of the soil, become green and perform photosynthesis. | Coleorrhiza remains in the soil only. |
Q13(c) . Differentiate between:
(c) integument and testa
Answer:
The differences between integument and testa are as follows:
Integument | Testa |
It is a pre fertilisation structure that covers the ovule | It is a post-fertilisation structure that covers the seed |
The integument is a thin layer consisting of living cells | Testa is a thick coat consisting of dead cells |
The integument arises from chalaza | Testa is derived from the integuments |
Q13(d). Differentiate between:
(d) perisperm and pericar
Answer:
The differences between perisperm and pericarp are as follows:
Perisperm | Pericarp |
Perisperm refers to the residual persistent nucellus | The pericarp is the wall of fruit derived from the ovary wall |
Perisperm is non-functional to the seed | The function of the pericarp is the protection of inside structures |
It is dry | It is fleshy. |
Q14. Why is apple called a false fruit? Which part(s) of the flower forms the fruit?
Answer:
The fruits are formed from the ovary of a flower after fertilisation. Such fruits that develop from the ovary are called true fruits. On the other hand, fruits formed from any part of the flower other than ovary are called false fruits. Apple is called a false fruit because it develops from the thalamus and not from the ovary.
The parts of flower that take part in fruit formation are ovary, thalamus etc.
Q15. What is meant by emasculation? When and why does a plant breeder employ this technique?
Answer:
The process of removal of anthers from the flower with the help of forceps without affecting the female reproductive parts is called emasculation. This technique is used by plant breeders to allow suggestive breeding between plants in order to produce plants with desired seeds. Hence, it can be used to prevent self-pollination or prevent cross-pollination according to the need of the breeder.
Answer:
The fruits formed as a result of parthenocarpy are generally seedless. Hence, for parthenocarpy, we can select fruits which have a lot of seeds in them. Such fruits include watermelon, orange, muskmelon, lemon etc. So we can select watermelon to induce parthenocarpy because by this method we can have seedless watermelons.
Q17. Explain the role of tapetum in the formation ofpollen-grain wall.
Answer:
Tapetum is the nutritive innermost layer of microsporangium that provides nutrition to the developing microspores. The role of tapetum in the formation of pollen grain wall is as follows:
- Tapetum secretes ubisch granules required for the formation of sporopollenin in the exine (outer wall) of pollen grain
- Tapetum also secretes pollenkit substances required for the formation of pollen grain wall
Q18 . What is apomixis and what is its importance?
Answer:
The process of development of seeds from diploid cells of nucellus tissue without the process of fertilisation is called apomixis. This process is a form of asexual reproduction that mimics sexual reproduction. Apomixis is very commonly seen in grasses.
Importance of apomixis
- Apomixis is used by horticulturists to produce hybrid seeds.
- Apomixis leads to the formation of infection-free embryos.
- Apomixis can be used to produce multiple embryos at a time.
- Apomictic embryos are genetically similar to their parent plants. For this reason, they can be used in order to conserve specific characters in crop plants.
class 12 biology ch 2 ncert solutions Sexual Reproduction in Flowering Plants will help you in both preparations as it will help you in your board exams along with the NEET preparation. A cell of the archesporium, the megaspore mother cell divides meiotically and one of the megaspores forms the embryo sac (the female gametophyte). The mature embryo sac is 7-celled and 8-nucleate. And so many interesting things are there in this chapter which you have to learn and class 12 biology chapter 2 Sexual Reproduction in Flowering Plants will make you clear.
NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants
In ch 2 bio class 12 NCERT solutions, you will understand that some questions are based on topics related to the pollen grains that develop inside the microsporangia of the flower. There are four wall layers, the epidermis, endothecium, middle layers, and tapetum surrounding the microsporangium. In the chapter 2 biology class 12 NCERT solutions, you will get all the solutions, but to understand them, you should be clear about every concept, like how the cells of the sporogenous tissue lying in the centre of the microsporangium, undergo meiosis (microsporogenesis) to form tetrads of microspores, etc. Pollen grains-related questions are also mentioned in the sexual reproduction in flowering plants class 12 NCERT pdf.
Let’s talk about the pistil. In Sexual reproduction in flowering plants ncert pdf, you will get questions and solutions about the pistil of a flower that has three parts – the stigma, style, and ovary. Ovules are present in the ovary. The ovules have a stalk called a funicle, protective integument(s), and an opening called the micropyle. You will also get questions from biology class 12 chapter 2 about the central tissue, the nucleus, in which the archesporium differentiates.. After going through the NCERT solutions for class 12 biology chapter 2 sexual reproduction in flowering plants, you will be aware of the important topics of this chapter.
Important Topics of NCERT Solutions For Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants
Important topics of biology chapter 2 class 12 are listed below:
- Flower - A Fascinating Organ of Angiosperms
- Pre - Fertilisation: Structures and Events
- Stamen, Microsporangium and Pollen Grain
- The Pistil, Megasporangium (ovule) and Embryo sac
- Pollination
- Double Fertilization
- Post - Fertilisation: Structures and Events
- Endosperm
- Embryo
- Seed
- Apomixis And Polyembryony
Highlights of NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants
The main features of the sexual reproduction in flowering plants class 12 pdf are:
Solutions for sexual reproduction in flowering plants ncert are provided by the subject experts in the best possible way.
It has a list of important topics
The answers are explained the simple language that is easier to read and understand.
Strengthen your fundamental knowledge.
Solutions are according to the latest syllabus provided by the CBSE.
NCERT Solutions are also helpful for competitive exams.
Use of labelled diagrams wherever necessary.
NCERT Solutions for Class 12 Biology- Chapter wise
Chapter 1 | Reproduction in organisms |
Chapter 3 | Human Reproduction |
Chapter 4 | Reproductive Health |
Chapter 5 | Principles of Inheritance and Variation |
Chapter 6 | Molecular basis of inheritance |
Chapter 7 | Evolution |
Chapter 8 | Human health and disease |
Chapter 9 | Strategies for Enhancement in Food Production |
Chapter 10 | Microbes in Human Welfare |
Chapter 11 | Biotechnology: Principles and Processes |
Chapter 12 | Biotechnology and its Applications |
Chapter 13 | Organisms and Populations |
Chapter 14 | Ecosystem |
Chapter 15 | Biodiversity and Conservation |
Chapter 16 | Environmental Issues |
NCERT Exemplar Class 12 Solutions
NCERT Exemplar Class 12 Chemistry Solutions |
NCERT Exemplar Class 12 Mathematics Solutions |
NCERT Exemplar Class 12 Biology Solutions |
NCERT Exemplar Class 12 Physics Solutions |
Frequently Asked Question (FAQs) - NCERT Solutions for Class 12 Biology Chapter 2 Sexual Reproduction in Flowering Plants
Question: What are the difference between coleoptile and coleorrhiza given in class 12 biology chapter 2
Answer:
The differences between coleoptile and coleorrhiza given in class 12 biology ch 2 ncert solutions are as follows:
Coleoptile | Coleorrhiza |
Coleoptile refers to the protective covering that surrounds plumule | Coleorrhiza is the sheath that surrounds the radicle and root cap |
This sheath can come out of the soil, become green and perform photosynthesis. | Coleorrhiza remains in the soil only. |
Question: Why you should use NCERT solutions for class 12 biology chapter 2 sexual reproduction in flowering plants?
Answer:
- NCERT is the base, especially for CBSE students.
- In NCERT solutions for class 12 biology chapter 2 sexual reproduction in flowering plants, you will get all the answers to this chapter and it will help you to score good marks in the exam.
- This will also help you to score good marks in competitive exams like NEET.
- NCERT solutions also help you in your 12th board exam.
- class 12 biology ch 2 ncert solutions sexual reproduction in flowering plants will also boost up your knowledge.
- To Score Well in the examination, follow NCERT syllabus and exercise given in the NCERT Book. To practice more problems, students can refer to NCERT exemplar
Question: What are the important topics which are mentioned in NCERT solution for class 12 biology chapter 2 sexual reproduction in flowering plants?
Answer:
These are the important topics which are mentioned in NCERT solutions for class 12 biology chapter 2 sexual reproduction in flowering plants:
- Flower - A Fascinating Organ of Angiosperms
- Pre - Fertilisation: Structures and Events
- Stamen, Microsporangium and Pollen Grain
- The Pistil, Megasporangium (ovule) and Embryo sac
- Pollination
- Double Fertilization
- Post - Fertilisation: Structures and Events
- Endosperm
- Embryo
- Seed
- Apomixis And Polyembryony
Question: What are the three fertilisation mentioned in ncert solutions for class 12 biology chapter 2?
Answer:
The three fertilisation mentioned in class 12 biology chapter 2 :
- Pre-fertilisation
- Double fertilisation
- Post-fertilisation
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I have got 91.5 percent in board 2020-21. Now bits pilani is giving direct admission to board toppers and first rank holders . Am i eligible for that? please check and inform me
Hi.
To be eligible for admission in BITS Pilani under the 'Direct admission to Board toppers' scheme, the candidate should be the topper from the science stream having taken Physics, Chemistry, Mathematics subjects in 12th. To identify the topper, the following criteria will be adopted.
Since you got 91.5 percent, which is a very good percentage, you will not be deemed as topper due to the missing 8.5% and there are students with percentage higher than yours. Therefore, if you wish to get admission in BITS Pilani then it will be through BITSAT.
Good Luck
I got 88.6% in cbse class 12th.Will I get admission in B.Sc at DU?
Hello student,
Hope you are in good health, so the answer to your question is as follows:-
First of all please get registered to delhi university admissions and fill the application fees.
Then try to calculate your best 4 according to the course .
As you have not mentioned which category you belong to , I am assuming you to be a general category student. So ,suppose if your best four came out to be somewhere like 89 , so if I see the last years cutoff for every BSC course the last cutoff comes out to be 89 , 87 where you can get bsc home science and bsc life science according to last year cutoff , but it always the chance of matter every year , cutoff always surprise us so you have to look every cutoff and when you find that you are getting the cutoff for that particular course do visit immediately to that college with all the correct papers and do the admission right away .
For further details you can go through the following link:-
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i have got 76.4% in cbse class 12th boards 2021.can i get admission in good college of du for ba hons pol science? if yes what are the possible colleges for me?
Hello there!
Hope you are doing fine.
For admission in BA political science, you have to calculate your best of four aggregates.
If your best of four aggregates are coming less than 80% and unfortunately you may have problem in getting admission in any good colleges of DU.
However, it may happen that you may get admission in 4th to 6th cut off lists.
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Check previous year cut off lists for clear idea.
Also, you can check your chances of getting admission in desired college of DU by clicking the link below:
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Stay safe.
Best wishes.
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Yes, assuming you are from General Category, with a great academic record in school, having a 7.5+ GPA from an Old IIT, having a CAT Percentile Score of 99.7+ you have fair chances in securing a Call from atleast 3 of the Top 6 IIMs, IIM ABCLKI.
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