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NCERT Solutions for Class 10 Science Chapter 8 How do Organisms Reproduce?

NCERT Solutions for Class 10 Science Chapter 8 How do Organisms Reproduce?

Edited By Irshad Anwar | Updated on Oct 08, 2023 11:02 AM IST | #CBSE Class 10th

NCERT Solutions for Class 10 Science Chapter 8 How do Organisms Reproduce?

NCERT Solutions for Class 10 Science Chapter 8: How do Organisms Reproduce? - As per the CBSE Syllabus 2023–24, this chapter has been renumbered as Chapter 7. Various organisms use different modes of reproduction depending on their body design, as given in the NCERT Textbook. Also, in fission, many bacteria and protozoa simply divide into two or more daughter cells, and organisms such as hydra can regenerate if they are broken into pieces. Such facts with a lot of examples are given in NCERT solutions for Chapter 8 Science Class 10: How do Organisms Reproduce? All the questions given in Chapter 8 of the NCERT Class 10 Science book are answered in these How Do Organisms Reproduce Class 10 Solutions. In the Biology NCERT Solutions for Class 10 Science Chapter 8, you are also going to study sexual and asexual reproduction in humans and plants.

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Biology NCERT Solutions Class 10 Science Chapter 8: As you go through the Class 10 Science Chapter 8 Question Answer, students will get the solutions for the questions given in NCERT textbook. The detailed solutions to the NCERT textbook questions are given so that students can compare their solutions to the model ones. Class 10 Science Chapter 8 Question Answer briefly explains the NCERT Textbook exercises questions. Candidates will be able to achieve high marks in the science subject by using the Reproduction Class 10 Questions and Answers. Read on to find out everything about NCERT Solutions Class 10 Science Chapter 8 How do organisms reproduce?.

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Download the NCERT Solutions for Class 10 Science Chapter 8 How Do Organisms Reproduce PDF for free. According to the CBSE Syllabus 2023–24, this chapter has been renumbered as Chapter 7.

NCERT Solutions for Class 10 Science Chapter 8 How do Organisms Reproduce - Download PDF

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NCERT Solutions for Class 10 Science Chapter 8 - How do Organisms Reproduce? (Intext Questions)

Class 10 Chapter 8 Science

Topic 8.1 Do organisms create exact copies of themselves: Page Number 128

Q. 1. What is the importance of DNA copying in reproduction?

Answer:

Importance of DNA copying in reproduction

  1. It keeps the characteristics of the parent species
  2. the characteristics and features are transferred to their progeny
  3. It produces variation in an organism which is the basis of the evolution of new species

Q. 2. Why is variation beneficial to the species but not necessarily for the individual?

Answer:

Variations are beneficial for the survival of the species. Populations of organisms fill well-defined places in the ecosystem, using their ability to reproduce. However, these places can change for reasons beyond the control of the organisms and could even wipe out the entire population. However, if some variations were to be present in a few individuals in these populations, there would be some chance for them to survive.

For example, - If there were a population of bacteria living in temperate waters and the water temperature were to be increased by global warming. Most of these bacteria would die, but the few heat resistant variants would survive and grow further. Variation is thus useful for the survival of species over time.

How do Organisms Reproduce Class 10, Topic 8.2 - Modes of Reproduction Used by Single Organisms:

Page Number 133

Q. 1. How does binary fission differ from multiple fission?

Answer:

Difference between binary fission and multiple fission-

BINARY FISSIONMULTIPLE FISSION
1. An organism divides into two similar organism.1. An organism produces two or more organism.
2. Does not form any layer.2. A cryst or thick layer is formed around the cell.
3. It generally occurs in optimal condition.
example- Amoeba
3. It can take place in any conditions.
example- Malarial parasite, Plasmodium


Q. 2. How will an organism be benefited if it reproduces through spores?

Answer:

An organism is benefited if it reproduces through spores because spores are surrounded by a thick layer and due to this they can be protected in adverse conditions. In favourable condition, these spores continue to grow again.

In this way, they can manage to survive in unfavourable condition.

Q. 3. Can you think of reasons why more complex organisms cannot give rise to new individuals through regeneration?

Answer:

Simple organisms like Hydra and Planaria can produce a new individual through the process of regeneration. However, In a complex multicellular organism have an organ-system level of organisation. Each organ systems of their body work together as an interconnected unit.

They have a high degree of organisation in their body. So, they cant be reproduced from their cut body parts by the regeneration process.

Q. 4. Why is vegetative propagation practised for growing some types of plants?

Answer:

Vegetative propagation- This method is used for growing certain types of plant which usually does not give any seed or produce non-viable seeds.

It is also used for plants growing which bears the superior traits because they produce genetically identical plants.

Q. 5. Why is DNA copying an essential part of the process of reproduction?

Answer:

DNA copying is an essential part of the process of reproduction so that the characteristics of the parent species are transmitted to it's down the line (offspring) and at the same time some variation also produced in the offspring.

This changes in the DNA provides an organism with the capability to survive in the changing condition.

NCERT Solutions Class 10 Science Chapter 8 How Do Organisms Reproduce, Topic 8.3 - Sexual reproduction: Page Number 140

Q. 1. How is the process of pollination different from fertilisation?

Answer:

Difference between pollination and the fertilization-

Pollination is the transfer of pollen grains from another stamen to the stigma of a capel. It takes place by certain pollinating agents such as air, water, birds and some insects etc.

On the other hand, fertilisation occurs when the male and female gametes fuse. It occurs inside the ovule and leads to the zygote formation.

Q. 2. What is the role of the seminal vesicles and the prostate gland?

Answer:

The role of the seminal vesicles and the prostate gland-

(i) Both secrets fluids which forms a part of the semen. The fluid of seminal vesical form 60% of the semen and the rest are from the prostate glands. It makes the path smooth through which sperm travels.

(ii) This fluid protects the sperm from the acid present in the urethra

(iii). Also, they can provide nutrition to the sperm in the form of calcium, fructose and some enzymes.

Q. 3. What are the changes seen in girls at the time of puberty?

Answer:

At the age of puberty, The following changes occur in girls-

  1. Mammary glands develop and enlarge.
  2. Hair grows under armpits and pubic region.
  3. Fallopian tube, uterus and vagina enlarge
  4. Menstruation starts
  5. Ovaries start to release eggs.

Q. 4. How does the embryo get nourishment inside the mother’s body?

Answer:

Inside the mother's body embryo gets nourishment from the mother's blood. There is a structure called placenta, it contains villi.

This provides a large surface area for glucose and oxygen to pass from the mother to the embryo.

Q. 5. If a woman is using a copper-T, will it help in protecting her from sexually transmitted diseases?

Answer:

No, Copper-T is a contraceptive method which prevents the formation of zygote inside the uterus.

It cannot prevent a woman from Sexually Transmitted Diseases.

NCERT Solutions Class 10 Science Chapter 8 How do Organisms Reproduce - Chapter-End Exercise:

Q. 1. Asexual reproduction takes place through budding in

(a) amoeba.
(b) yeast.
(c) plasmodium.
(d) leishmania.

Answer:

The correct option is (b). In asexual reproduction, an offspring is reproduced from a single parent species. Yeast can reproduce by budding methods.

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:

The correct option is (c). Except for vas deferens, all the options are part of the female reproductive system. Vas deferens is a duct which conveys sperm from the testicle to the urethra.

Q. 3. The anther contains

(a) sepals.
(b) ovules.
(c) pistil.
(d) pollen grains.

Answer:

The correct option is (d). The anther is a part of stamen which contains pollen grains.

Q. 4. What are the advantages of sexual reproduction over asexual reproduction?

Answer:

Advantages of sexual reproduction:

  1. In sexual reproduction, more variations are produced. Thus, it ensures the survival of species in a population.
  2. The newly formed individual has characteristics of both the parents.
  3. Variations are more viable in sexual mode than in asexual one. This is because, in asexual reproduction, DNA has to function inside the inherited cellular apparatus.

Class 10 Science Ch 8 Question Answer

Q. 5. What are the functions performed by the testis in human beings?

Answer:

The function of testis-

  1. It produces male gametes called sperms.
  2. It produces a hormone called testosterone which controls the development of reproductive organs and secondary sexual characters.

Q. 6. Why does menstruation occur?

Answer:

If the egg of the female does not get fertilised with the sperm, then the thick and soft lining of the uterus is no longer needed, and thus it breaks. Therefore, the lining of the uterus along with the blood vessels and the dead ovum (egg) comes out from the vagina in the form of blood called menstruation.

Q. 7. Draw a labelled diagram of the longitudinal section of a flower.

Answer:

Labelled diagram of the longitudinal section of a flower -
15965683861911596568383349

Q. 8. What are the different methods of contraception?

Answer:

The different method of contraception are as follows-

  1. Barrier method- In this method, condom, diaphragm and cervical caps are used. They prevent the entry of the sperm inside the female body during intercourse.
  2. Chemical method- In this method, women uses pills to suppress the release of an ovum in the fallopian tube.
  3. Contraceptive devices- Intrauterine contraceptive devices such as copper-T are placed in the uterus, and it prevents the sperms from reaching the uterus.
  4. Surgical method- In this method, vas deferens of the male and fallopian tube of the female is cut or tied by surgery.

Q. 9. How are the modes for reproduction different in unicellular and multicellular organisms?

Answer:

Difference between mode of reproduction in a unicellular and multicellular organism-

IN UNICELLULAR IN MULTICELLULAR
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 the multicellular organism.
2. A male and female both are required in this method.
3. Special cell and organs are presents for reproduction

Q. 10. How does reproduction help in providing stability to populations of species?

Answer:

The variation due to the reproduction gives stability to the population of various species by preventing them from getting erased during adverse condition. Reproduction also helps to produce copies of individuals which are adapted for a particular environment.

Q. 11. What could be the reasons for adopting contraceptive methods?

Answer:

The reasons for adopting contraceptive methods are-

  1. To control the birth rate. So that we can prevent an increase in population.
  2. To prevent from STDs
  3. To prevent unwanted pregnancy.


NCERT Solutions for Class 10 Science: Important Formulas and Diagrams + eBook link

Class 10 Ch 8 Science: When it comes to science, apart from the Class 10 Science Chapter 8 Question Answer, gathering the most crucial formulas, diagrams, and points in a single location allows for a quick glance and an instant reminder, which can reduce revision time once the concepts are understood.

These equations, diagrams, and key ideas will appear frequently in your final exams and monthly tests. After going through the How Do Organisms Reproduce Class 10 Solutions, go through this ebook to save time and quickly review each crucial formula with examples from Ch 8 Science Class 10 that you might see on your exams.

Download Ebook - NCERT Class 10 Science: Chapterwise Important Formulas, Diagrams, And Points

NCERT Solutions for Class 10 Science Chapter 8 How Do Organisms Reproduce?: Topics And Subtopics

Let's take a quick look at the topics and subtopics covered in NCERT Solutions For Class 10 Science Chapter 8 How Do Organisms Reproduce? before diving into the specifics of how do organisms reproduce class 10 extra questions and answers:

  • How Do Organisms Reproduce?
  • Do Organisms Create Exact Copies Of Themselves?
  • Modes Of Reproduction Used By Single Organisms
  • Sexual Reproduction
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CBSE NCERT Solutions for Class 10th Science: Chapter-wise

NCERT Solutions for Class 10 Science Chapter 8 - Types of Questions and Their Weightage in Board Exams

In Chapter 8 Class 10 Science, very short answers, short answers, long answers, and practical-based questions are asked in Class 10 CBSE Science board exam. These questions range between 1 and 5 marks.

Ch 8 Science Class 10 carries a weightage of 8–10 marks in the exam. How do organisms reproduce Class 10 Solutions help students get those 8–10 marks in board exams if they go through the solutions thoroughly.

Careers360 provides NCERT solutions that are available for Classes 6 to 12. Also, check the NCERT solutions for Class 10 for other subjects.

More about How do Organisms Reproduce Class 10 Science Solutions

Ch 8 Class 10 Science: Reproduction, unlike other life processes, is not essential to maintaining the life of an individual organism. Such a fact is presented and explained in How Do Organisms Reproduce Solutions of Chapter 8 Class 10 Science?

Reproduction involves the creation of a DNA copy and additional cellular apparatus by the cell involved in the process.

In this How Do Organisms Reproduce Class 10 Questions and Answers, you are going to study broadly on three topics:

  • Modes of reproduction used by single organisms
  • Sexual and asexual reproduction
  • Do organisms create exact copies of themselves?

Benefits of NCERT Solutions Class 10 Science Chapter 8 - How do Organisms Reproduce

  • Important tips and facts are given in How do Organisms Reproduce Class 10 Solutions with the appropriate examples and diagrams, which aid in remembering topics easily.
  • There is a concept behind every question in Ch 8 Science Class 10. Such concepts have been explained in the Class 10 Science Chapter 8 NCERT solutions.
  • Examples given in NCERT Class 10 Science Chapter 8 Solutions are based on real-life scenarios. Therefore, students can relate them to their surroundings.

Highlights of NCERT Solutions for Class 10 Science Chapter 8 How do Organisms Reproduce?

  • The NCERT (CBSE) Syllabus and Books are strictly followed in the How Do Organisms Reproduce Class 10 Solutions.
  • Ch 8 Science Class 10 are easy-to-understand and comprehensive.
  • On this page, you will find clear and concise solutions to Class 10 Chapter 8 Science.
  • The How Do Organisms Reproduce Class 10 PDF help clear doubt and give in-depth knowledge of concepts.
  • Class 10 Science Chapter 8 Question Answer are prepared by subject matter experts in the easiest possible way.
  • All the exercise questions and in-text solved questions are available in the Chapter 8 Science Class 10 PDF.
  • Step-wise solutions are provided herein in Class 10 Science Ch 8 Question Answer.
  • Diagrams are provided in the "How do Organisms Reproduce Class 10 Solutions PDF, wherever required, to better understand.
  • Class 10 Science Ch 8 Solutions will help you score well in board exams.
  • How Do Organisms Reproduce Class 10 Questions and Answers PDF is accessible to everyone at any time, anywhere, without any difficulty.
  • This page contains a free How do Organisms Reproduce Class 10 NCERT Solutions PDF.
  • For CBSE exams, Science Olympiads, and other competitive exams, these solutions for Biology Class 10 How Do Organisms Reproduce will be useful.

NCERT Solutions for Class 10 | Subject-wise Links

Also check the NCERT Books and NCERT Syllabus here:

Frequently Asked Question (FAQs)

1. Which kind of questions are asked from Chapter 8 of Class 10 Science?

The following type of questions are asked from this chapter:

  • Very short answer
  • Short answers
  • Long answers
  • Practical based questions
2. What is the weightage of NCERT Solutions for Class 10 Science Chapter 8?

This chapter carries a weightage of 8-10 marks in the exam. To get more questions related to  How do Organisms Reproduce refer to NCERT exemplar and CBSE previous year papers.

3. Explain the process of asexual reproduction covered in Chapter 8 of NCERT Solutions for Class 10 Science.

Asexual reproduction belongs to lower animals. Their reproductive cells lack gametes. Genes maintain biological characteristics by being passed down from one generation to the next. It is recommended that students download the PDF of the solutions in order to fully comprehend the concepts covered in this chapter. With the intention of assisting students in performing well on the CBSE exams, a team of highly qualified subject matter experts has created the solutions.

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Thanking you

Hello aspirant,

The dates of the CBSE Class 10th and Class 12 exams are February 15–March 13, 2024 and February 15–April 2, 2024, respectively. You may obtain the CBSE exam date sheet 2024 PDF from the official CBSE website, cbse.gov.in.

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Hello aspirant,

The paper of class 7th is not issued by respective boards so I can not find it on the board's website. You should definitely try to search for it from the website of your school and can also take advise of your seniors for the same.

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Thank you

Hope it helps you.

The eligibility age criteria for class 10th CBSE is 14 years of age. Since your son will be 15 years of age in 2024, he will be eligible to give the exam.

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A block of mass 0.50 kg is moving with a speed of 2.00 ms-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

Option 1)

0.34\; J

Option 2)

0.16\; J

Option 3)

1.00\; J

Option 4)

0.67\; J

A person trying to lose weight by burning fat lifts a mass of 10 kg upto a height of 1 m 1000 times.  Assume that the potential energy lost each time he lowers the mass is dissipated.  How much fat will he use up considering the work done only when the weight is lifted up ?  Fat supplies 3.8×107 J of energy per kg which is converted to mechanical energy with a 20% efficiency rate.  Take g = 9.8 ms−2 :

Option 1)

2.45×10−3 kg

Option 2)

 6.45×10−3 kg

Option 3)

 9.89×10−3 kg

Option 4)

12.89×10−3 kg

 

An athlete in the olympic games covers a distance of 100 m in 10 s. His kinetic energy can be estimated to be in the range

Option 1)

2,000 \; J - 5,000\; J

Option 2)

200 \, \, J - 500 \, \, J

Option 3)

2\times 10^{5}J-3\times 10^{5}J

Option 4)

20,000 \, \, J - 50,000 \, \, J

A particle is projected at 600   to the horizontal with a kinetic energy K. The kinetic energy at the highest point

Option 1)

K/2\,

Option 2)

\; K\;

Option 3)

zero\;

Option 4)

K/4

In the reaction,

2Al_{(s)}+6HCL_{(aq)}\rightarrow 2Al^{3+}\, _{(aq)}+6Cl^{-}\, _{(aq)}+3H_{2(g)}

Option 1)

11.2\, L\, H_{2(g)}  at STP  is produced for every mole HCL_{(aq)}  consumed

Option 2)

6L\, HCl_{(aq)}  is consumed for ever 3L\, H_{2(g)}      produced

Option 3)

33.6 L\, H_{2(g)} is produced regardless of temperature and pressure for every mole Al that reacts

Option 4)

67.2\, L\, H_{2(g)} at STP is produced for every mole Al that reacts .

How many moles of magnesium phosphate, Mg_{3}(PO_{4})_{2} will contain 0.25 mole of oxygen atoms?

Option 1)

0.02

Option 2)

3.125 × 10-2

Option 3)

1.25 × 10-2

Option 4)

2.5 × 10-2

If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will

Option 1)

decrease twice

Option 2)

increase two fold

Option 3)

remain unchanged

Option 4)

be a function of the molecular mass of the substance.

With increase of temperature, which of these changes?

Option 1)

Molality

Option 2)

Weight fraction of solute

Option 3)

Fraction of solute present in water

Option 4)

Mole fraction.

Number of atoms in 558.5 gram Fe (at. wt.of Fe = 55.85 g mol-1) is

Option 1)

twice that in 60 g carbon

Option 2)

6.023 × 1022

Option 3)

half that in 8 g He

Option 4)

558.5 × 6.023 × 1023

A pulley of radius 2 m is rotated about its axis by a force F = (20t - 5t2) newton (where t is measured in seconds) applied tangentially. If the moment of inertia of the pulley about its axis of rotation is 10 kg m2 , the number of rotations made by the pulley before its direction of motion if reversed, is

Option 1)

less than 3

Option 2)

more than 3 but less than 6

Option 3)

more than 6 but less than 9

Option 4)

more than 9

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