NCERT Solutions for Class 10 Science Chapter 7 help students to compare their answers with the ones given by experts, so it becomes easier to know what kind of answer is expected. This chapter is about how living things reproduce and why reproduction is needed. Students learn about two main types of reproduction: asexual and sexual. Asexual reproduction happens from one parent only and includes methods like budding, fission, etc. In sexual reproduction, two parents are involved, where male and female cells join to form a new organism. These NCERT Solutions are a good and simple way to understand the chapter properly and revise the important points.
This Story also Contains
- NCERT Solutions for Class 10 Science Chapter 7: Download PDF
- Detailed Answers to Science NCERT Class 10 Chapter 7 (Intext Questions)
- Access Answers to NCERT Solutions Class 10 Science Chapter 7 (Chapter-End Exercise)
- Approach to Solve NCERT Solutions for Class 10 Chapter 7
- Topics and Subtopics of Class 10 Science Chapter 7
- Important Question of Class 10 Chapter 7
- CBSE NCERT Solutions for Class 10 Science
NCERT Solutions for Class 10 Science Chapter 7 How do Organisms Reproduce? The NCERT Solutions for Class 10 Science give step-by-step answers which help students to check their understanding and learn the basics better. These solutions are made by subject experts but written in easy and simple words so students can understand them without much problem. It also helps in clearing small doubts which come while reading the book. During revision, it saves time because the answers are already explained clearly. These solutions help students to understand the main points and do better in exams. That’s why the NCERT Solutions for Class 10 are a useful study material for students.
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NCERT Solutions for Class 10 Science Chapter 7: Download PDF
The downloadable PDF of the questions with detailed answers is given below :
Download Solutions PDF
Detailed Answers to Science NCERT Class 10 Chapter 7 (Intext Questions)
Clear and well-explained solutions to all the in-text questions to help you understand the concepts more easily and improve your exam preparation are provided below:
Topic 7.1 Do organisms create exact copies of themselves
Page Number 114
Q. 1. What is the importance of DNA copying in reproduction?
Answer:
The importance of DNA replication in reproduction is as follows:
It allows offspring to inherit traits from their parents.
It helps keep the species' characteristics the same over time.
It produces variation within a species, which is critical for adapting and evolving.
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Q. 2. Why is variation beneficial to the species but not necessarily to the individual?
Answer:
Variation is useful to a species as it allows some individuals to adapt to changes in their environment, which helps the survival of the species. As an example, if there were an outbreak of disease, those with genetic resistance would be able to survive and reproduce. Variation, though, is not always profitable to an individual, as certain differences could make survival more difficult for some organisms.
Topic 7.2 - Modes of Reproduction Used by Single Organisms
Page Number 119
Q. 1. How does binary fission differ from multiple fission?
Answer:
The difference between binary fission and multiple fission are given below:
Binary Fission | Multiple Fission |
One organism splits into two equal parts. | One organism divides into many smaller parts. |
Common in bacteria. | Seen in some protozoa like Plasmodium. |
Simple and quick division. | More complex division results in many individuals at once. |
Q. 2. How will an organism benefit if it reproduces through spores?
Answer:
Spore reproduction is a successful mode of survival and spreading in unfavourable conditions.
Spores can resist extreme conditions because of the thick covering walls.
They spread conveniently over distances, enabling the organism to grow in new areas.
Q. 3. Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?
Answer:
Regeneration is common in simpler organisms but is limited in complex organisms because of their body structure.
Q. 4. Why is vegetative propagation practised for growing some types of plants?
Answer:
Vegetative propagation is a method of asexual reproduction used in plant cultivation of desirable traits on an economic scale.
Q. 5. Why is DNA copying an essential part of the process of reproduction?
Answer:
DNA replication ensures the passing on of genetic information during reproduction for species continuity and adjustment.
It makes children inherit traits from their parents, making species characteristics consistent.
Mutations in DNA replication help species adapt and evolve with changing environments.
Topic 7.3 - Sexual reproduction
Page Number 126
Q. 1. How is the process of pollination different from fertilisation?
Answer:
Fertilisation and pollination are the two most important processes of plant reproduction. Pollination is the movement of pollen, whereas fertilisation is gamete fusion.
Pollination: Movement of the pollen grains from the male element (anther) to the female element (stigma) of a flower.
Fertilisation: Male and female gamete fusion, resulting in the formation of a zygote, which is a process after pollination.
Q. 2. What is the role of the seminal vesicles and the prostate gland?
Answer:
The prostate gland and seminal vesicles are significant in male reproduction due to their role in secreting fluids that support and carry sperm.
Seminal Vesicles: Secrete a sweet fluid that gives energy to sperm and aids in semen development.
Prostate Gland: Produces a fluid that assists in sperm protection and stimulation and adds to semen volume.
Q. 3. What are the changes seen in girls at the time of puberty?
Answer:
Puberty results in various physical and emotional modifications in women as they grow into adults.
Q. 4. How does the embryo get nourishment inside the mother’s body?
Answer:
The embryo is supported by the placenta, which links it to the mother's bloodstream.
Q. 5. If a woman is using a copper-T, will it help in protecting her from sexually transmitted diseases?
Answer:
A copper-T is an intrauterine device (IUD) for contraception, but it does not offer protection against sexually transmitted diseases (STDs).
It works by making the environment not conducive to sperm, but it does not close off infection.
Further protection, like condoms, is required to minimise the risk of STDs.
Access Answers to NCERT Solutions Class 10 Science Chapter 7 (Chapter-End Exercise)
Here are the step-by-step solutions to all the chapter-end exercise questions that help in revising the concepts thoroughly and easily.
Exercises Page no: 127
Q. 1. Asexual reproduction takes place through budding in
(a) amoeba.
(b) yeast.
(c) plasmodium.
(d) leishmania.
Answer:
Budding is a form of asexual reproduction where a new organism develops from a part of the parent.
The correct answer is Option (b) Yeast.
Q. 2. Which of the following is not a part of the female reproductive system in human beings?
(a) Ovary
(b) Uterus
(c) Vas deferens
(d) Fallopian tube
Answer:
Understanding the components of the female reproductive system is essential for biology.
The correct answer is Option (c) Vas deferens.
Q. 3. The anther contains
(a) sepals.
(b) ovules.
(c) pistil.
(d) pollen grains.
Answer:
The anther is an important part of the flower involved in reproduction.
The correct answer is Option (d) Pollen grains.
Q. 4. What are the advantages of sexual reproduction over asexual reproduction?
Answer:
Sexual reproduction produces variation due to the mixing of genes from two parents. This variation helps species adapt and survive in changing environments. It also reduces the chances of genetic diseases being passed on directly.
Q. 5. What are the functions performed by the testis in human beings?
Answer:
The testes have important functions in male reproductive health and function.
They produce sperm cells required for reproduction.
They secrete hormones, mainly testosterone, which control male characteristics and reproductive functions.
Q. 6. Why does menstruation occur?
Answer:
Menstruation is a natural phenomenon that occurs in women as part of the reproductive cycle.
Q. 7. Draw a labelled diagram of the longitudinal section of a flower.
Answer:
A labelled diagram of a flower typically includes various parts such as petals, sepals, stamens, and pistils.
Labelled diagram of the longitudinal section of a flower
Q. 8. What are the different methods of contraception?
Answer:
Methods of contraception prevent pregnancy and can be very diverse in method.
Barrier methods (such as condoms), hormonal methods (such as the pill), and intrauterine devices (IUDs) are a few examples.
Natural methods involve monitoring ovulation and avoiding sex during fertile times.
Q. 9. How are the modes of reproduction different in unicellular and multicellular organisms?
Answer:
Difference between the mode of reproduction in a unicellular and a multicellular organism-
UNICELLULAR ORGANISMS | MULTICELLULAR ORGANISMS |
1. Asexual reproduction takes place in the unicellular organism. 2. Only one Parent is required to produce offspring. 3. No special cells and organs are present for reproduction. | 1. Sexual reproduction takes place in multicellular organisms. 2. A male and a female are both required in this method. 3. Special cells and organs are present for reproduction |
Q. 10. How does reproduction help in providing stability to populations of species?
Answer:
Reproduction is required to sustain healthy species populations over the long term.
It allows for population growth, which ensures species can survive environmental changes.
Reproduction also allows for genetic diversity, enhancing adaptability and resistance to disease.
Q. 11. What could be the reasons for adopting contraceptive methods?
Answer:
Individuals use contraceptive methods for different personal and health-related reasons.
Approach to Solve NCERT Solutions for Class 10 Chapter 7
Begin with careful reading of the chapter to understand the fundamental concepts of reproduction, both asexual and sexual.
- First, read the chapter slowly to understand the basics of reproduction, both asexual and sexual. Don’t rush. Just try to get the idea.
- Focus more on processes like binary fission, budding, and vegetative propagation. Try to imagine or draw them while reading. It helps a lot.
- Understand how reproduction happens in plants and humans. Know the parts involved and what each part does.
- Try to learn the differences between various methods of reproduction simply. Making small notes or a table helps.
- Solve all NCERT questions properly and practice diagrams. Keep them neat and clearly labelled—these always come in exams.
- Revise from exemplar questions or any extra books only after you’ve finished the basics. That will make your base stronger.
Also, check the NCERT Books and NCERT Syllabus here:
Topics and Subtopics of Class 10 Science Chapter 7
The chapter is divided into several important topics and subtopics so that the whole concept of reproduction in organisms can be understood completely. The most crucial topics are:
1. Introduction to Reproduction
2. Asexual Reproduction
3. Sexual Reproduction
4. Reproductive Health
Important Question of Class 10 Chapter 7
Question 1:
Explain the parts of the female reproductive system.
Answer:
The female reproductive system consists of a pair of ovaries, a duct system that consists of a pair of fallopian tubes, uterus, cervix, vagina.
1. Ovaries: The ovaries are the primary female sex organs. They produce ova and secrete the female sex hormones estrogen and progesterone, which are responsible for the development of secondary female sex characteristics and produce marked changes in the uterine endometrium.
2. Fallopian Tubes: These are parts of the female reproductive tract that receive the ovum, provide an appropriate environment for its fertilisation, and then transport it to the uterus. A fallopian tube is a muscular tube about 10 cm in length. A mature ovum is released each month from an ovary into one of the two Fallopian tubes leading to the uterus.
3. Uterus: The uterus or womb is a hollow, muscular cavity about 7–8 cm in length and 5 cm in width. The wall of the uterus has three layers.
4. Cervix: The lower part of the uterus is very narrow and is called the cervix. A part of the cervix projects into the upper part of the vagina.
5. Vagina: It is a muscular passage about 10 to 15 cm long that connects the uterus with the external world. It is composed of muscle and connective tissues, and the walls of the vagina are usually folded inward.
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CBSE NCERT Solutions for Class 10 Science
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