NCERT Solutions For Class 8 Science Chapter 6 Reproduction In Animals

1. Explain the importance of reproduction in organisms.

Ans: Importance of reproduction:

1. Human reproduction is essential for the continuance of the human species.

2. It is the process of producing new individuals from the living organisms.

3. Reproduction ensures the passage of traits and habitats from generation to generation.  

4. Without reproduction the species will be vanished from the earth and there is no world without species.

2. Describe the process of fertilization in human beings.

Ans: Process of fertilization in human beings: 

1. Human reproduction is brought about by formation and fusion of the male and female gametes. The male gametes, i.e. the sperms are produced by the testis and the female gametes, i.e. the ovum is produced by the ovary. 

2. During copulation, the male releases sperm into the female reproductive tract. Since the sperm is a motile gamete, it will swim up the female reproductive tract to reach the ovum in the fallopian tube.

3. The process of fertilization happens when the male and female gametes fuse together in the fallopian tube. The end product of fertilization is called a zygote, which will develop further and become a foetus in the womb.

3. Choose the most appropriate answer.

a. Internal fertilisation occurs 

1. In the female body. 

2. Outside female body. 

3. In male body.

4. Outside male body

Ans: 

I. In a female body

Internal fertilization takes place inside the female body and external fertilization takes place outside the female body.

b. A tadpole develops into an adult frog by the process of

1. Fertilisation. 

2. Metamorphosis 

3. Embedding 

4. Budding 

Ans: (II) Metamorphosis

Fertilization takes place in human beings by the fusion of gametes and budding is a type of asexual reproduction takes place in parents in forming the buds.

c. The number of nuclei present in a zygote is 

1. None 

2. One 

3. Two 

4. Four 

Ans: (II) one

Only one nuclei is present in a zygote.

4. Indicate whether the following statements are true (T) or false (F).

1. Oviparous animals give birth to young one.

Ans: F

Oviparous animals lay eggs and the young ones develop inside it.

2. Each sperm is a single cell.

Ans: T 

3. External fertilisation takes place in frogs.

Ans: T 

4. A new human individual develops from a cell called gamete.

Ans: T

5. Egg laid after fertilisation is made up of a single cell.

Ans: T

6. Amoeba reproduces by budding.

Ans: F

Amoeba reproduces asexually through binary fission. 

7. Fertilisation is necessary even in asexual reproduction.

Ans: T

8. Binary fission is a method of asexual reproduction.

Ans: T

9. A zygote is formed as a result of fertilisation.

Ans: T 

10. An embryo is made up of a single cell.

Ans: F

Embryo is a multicellular structure.

4. Give two differences between a zygote and Foetus.

Ans: Difference between zygote and foetus:

5. Define asexual reproduction. Describe two methods of asexual reproduction in animals.

Ans: Asexual Reproduction:

1. It is a mode of reproduction that does not entails the union of sex cells or gametes.

2. There are different types of asexual reproduction, they are binary fission, budding vegetative propagation, spore formation, fragmentation. There is no gamete formation in this type of reproduction. Animals like Hydra, Amoeba undergo asexual mode of reproduction. 

Two types of Asexual reproduction are: 

1. Budding: It is a type of asexual reproduction in which a new organism develops from an outgrowth or bud due to cell division at one particular site. These buds develop into tiny individuals and when fully they mature and detach from the parets body and become a new independent individual. Example: Hydra. 

2. Binary Fission: In this type of asexual reproduction the body of the organism mainly unicellular organism divides into two.  Each of the two daughter cells are alike. Example: Amoeba.

6. In which female reproductive organ does the embryo get embedded?

Ans: The embryo gets embedded in the wall of the uterus for further development.

7. What is metamorphosis? Give examples.

Ans: Metamorphosis:

It means sudden change which happens while developing.

The animals that undergoes metamorphosis are 

1. Butterfly (egg🡪larva🡪pupa🡪adult) 

2. Frog (egg🡪tadpole🡪adult)

8. Difference between internal fertilisation and external fertilisation.

Ans: Difference between internal fertilization and external fertilization: 

9. Complete the crossword puzzle using the hints given below. Across 

1. The process of the fusion of the zygotes. 

6. The type of fertilisation in hen. 

7. Term used for bulges observed on the sides of the body of hydra. 

8. Eggs are produced here.

Down 

2. Sperms are produced in these male reproductive organs.

3. Another term for the fertilized egg. 

4. These animals lay eggs. 

5. A type of fission in amoeba.

Ans:

1. The process of the fusion of the zygotes - FERTILIZATION

6. The type of fertilisation in hen - INTERNAL

7. Term used for bulges observed on the sides of the body of hydra - BUDS

8. Eggs are produced here - OVARY

Down 

2. Sperms are produced in these male reproductive organs - TESTES

3. Another term for the fertilized egg - ZYGOTE

4. These animals lay eggs - OVIPAROUS

5. A type of fission in amoeba – BINARY

NCERT Class 8 Reproduction in Animals- Quick Overview of Detailed Structure of Topics 

Important Points from Class 8 Science Chapter 6 PDF

1. Types of Reproduction:

• Asexual Reproduction: Involves one parent; offspring are genetically identical to the parent. Methods include budding, fission, regeneration, and fragmentation.

• Sexual Reproduction: Involves the fusion of male and female gametes (sperm and egg) to form a zygote, leading to genetic variation.

2. Male Reproductive System:

• Organs: Testes, vas deferens, penis.

• Function: Testes produce sperm, which is transported through the vas deferens and released through the penis.

3. Female Reproductive System:

• Organs: Ovaries, fallopian tubes, uterus, vagina.

• Function: Ovaries produce eggs; fertilisation occurs in the fallopian tubes, and the fertilised egg implants in the uterus.

4. Fertilisation:

• Process: Sperm fuses with an egg to form a zygote, usually in the female reproductive tract.

5. Viviparous Animals:

• Give birth to live young.

• Examples: Humans, dogs, whales.

6. Oviparous Animals:

• Lay eggs that hatch into offspring.

• Examples: Birds, reptiles, amphibians, and most fish.

Benefits of Referring to Vedantu’s NCERT Class 8 Science Chapter 6 Question Answer

• Vedantu’s Class 8 Science Reproduction In Animals Question Answer comprehensively explains each topic in Chapter 6, ensuring a thorough understanding of animal reproduction concepts.

• Reproduction In Animals Class 8 PDF follows a structured approach, breaking down complex topics like types of reproduction.

• The topics like the reproductive systems of animals, fertilisation, and life cycle into small sections, making it easier for students to grasp the content.

• Concepts are explained in a clear and simple language, making it accessible for students of all learning levels.

• Class 8 Science Reproduction In Animals includes diagrams, illustrations, and charts to help visual learners understand complex concepts more easily.

• Class 8 Reproduction In Animals Question Answer helps students learn about the structural adaptations of different animals for reproduction, such as the reproductive organs and their functions.

• Vedantu offers supplementary resources such as video lectures, quizzes, and study materials to complement the chapter solutions, providing a holistic learning experience.

Conclusion

Vedantu’s NCERT Solutions for Class 8 Science Chapter 6: Reproduction in Animals is an excellent resource for understanding key concepts like modes of reproduction, fertilisation, and development of embryos. Students should focus on these areas to grasp the essentials of animal reproduction. The solutions simplify complex topics, making them easy to understand and apply. Additionally, practice is crucial as the previous year's question papers often include around 10 questions from this chapter. By studying these solutions, students can confidently prepare for exams and improve their understanding of the subject.

Important Study Materials for Class 8 Science Chapter 5

Students can access extra study materials on the Conservation of Plants and Animals. These resources are available for download and offer additional support for your studies.

NCERT Solutions for Class 8 Science-Chapter wise PDF Links

NCERT Study Resources for Science Class 8 

For complete preparation of Science for CBSE Class 8 exams, check out the following links for different study materials available at Vedantu.