NCERT Solutions for Class 8 Science Chapter 9 - Free PDF Download
1. Explain the importance of reproduction in organisms.
Ans: Importance of reproduction:
Human reproduction is essential for the continuance of the human species.
It is the process of producing new individuals from the living organisms.
Reproduction ensures the passage of traits and habitats from generation to generation.
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:
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.
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.
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
In the female body.
Outside female body.
In male body.
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
Fertilisation.
Metamorphosis
Embedding
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
None
One
Two
Four
Ans: (II) one
Only one nuclei is present in a zygote.
4. Indicate whether the following statements are true (T) or false (F).
Oviparous animals give birth to young one.
Ans: F
Oviparous animals lay eggs and the young ones develop inside it.
Each sperm is a single cell.
Ans: T
External fertilisation takes place in frogs.
Ans: T
A new human individual develops from a cell called gamete.
Ans: T
Egg laid after fertilisation is made up of a single cell.
Ans: T
Amoeba reproduces by budding.
Ans: F
Amoeba reproduces asexually through binary fission.
Fertilisation is necessary even in asexual reproduction.
Ans: T
Binary fission is a method of asexual reproduction.
Ans: T
A zygote is formed as a result of fertilisation.
Ans: T
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:
It is a mode of reproduction that does not entails the union of sex cells or gametes.
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:
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.
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
Butterfly (egg🡪larva🡪pupa🡪adult)
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 Solutions for Class 8 Science Chapter 9 - Reproduction in Animals
It is very easy to download NCERT Solution for Chapter 9 Reproduction in Animals Class 8 Chapter 9 PDF from our website and app. Reproduction in Animals is an exciting chapter of NCERT Class 8 Science. The topic sheds knowledge on numerous modes of duplication and explains them with pictorial representations. Assignments given in the curriculum will enhance the knowledge of students and help them score more marks in the examination. Biology is a theoretical subject. Thus it is very hard for students to remember all the ideas given in the syllabus. To ease your understanding, NCERT Solution caters to a revolutionary mastering approach to help you apprehend and memorize Biology concepts.
NCERT Solutions Science Class 8
Chapter 9- Reproduction In Animals
NCERT Solution Class 8 Science chapter Reproduction in Animals is an easy and interesting chapter. This chapter gives you detailed knowledge about asexual and sexual reproduction, modes of reproduction in animals, fertilization and its different types, binary fission, budding in hydra, reproductive organs, etc. The material is covered with all possible questions answers, diagrams and some fun activities. Each line of the chapter is explained in such a way that every student can understand it easily and memorize. NCERT Solutions cover all types of questions that have higher chances to come in the exam.
Class 8 Science Chapter-Wise Marks Weightage
Class 8 Chapter 9 is one of the most important topics and has the highest weightage among all. Questions from this chapter keep repeating every year in the exams. The material will help you prepare this chapter and score well. Here is more info about the content of this chapter:
Why are NCERT Solutions for Class 8 Science Chapter 9 Important?
The solutions to the questions are provided in detail with proper diagrams and explanations.
NCERT Solutions help you to get theoretical knowledge of the subject.
All answers are explained by our subject experts in a simplified manner.
These solutions help you with last-minute preparation before the exam.
It contains all activities which help students for better preparation.
NCERT Solutions provide a quick recap of the chapter.
Chapter wise NCERT Solutions for Class 8 Science
Chapter 9 - Reproduction in Animals
Along with this, students can also view additional study materials provided by Vedantu, for Class 8 :
Download Class 8 Science Chapter 9 Reproduction in Animals NCERT Solutions PDF
Get the free PDF version of these NCERT solutions for all the exercises of Class 8 Science Chapter 9 Reproduction in Animals. Follow how the experts have compiled the specific answers to these questions and practice. Develop your conceptual foundation and answering skills for this chapter by using the advantages of these solutions to stay ahead of the competition in the class.
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Conclusion
Class 8 Science Chapter 9 is an important chapter that lays the foundation for future Science. Vedantu's Class 8 Science Chapter 9 - Reproduction In Animals Solutions is a comprehensive and informative resource that will help students to understand the concepts, solve problems, and improve their analytical skills.
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FAQs on NCERT Solutions for Class 8 Science Chapter 9 - Reproduction In Animals
1. Explain the difference between a Zygote and a Foetus?
The difference between a zygote and a foetus is
Zygote– Zygote is the first stage of development. It is developed by the fusion of male and female gametes. It is a single cell. The zygote is divided to form an embryo. It lasts for a few weeks and then develops into the next stage.
Foetus– Foetus is the last stage of the development of an organism. Foetus usually undergoes an internal development. The stage of an embryo that shows all the main body parts of a mature organism.
2. Explain two methods of Asexual reproduction in animals?
The two modes of asexual reproduction are:
Binary Fission in Amoeba– It is asexual reproduction in which one cell is divided into two equal parts. It is a unicellular organism that consists of a cell membrane, cell wall and cytoplasm. In this process, the nucleus of amoeba is first divided into two parts to form daughter nuclei.
Budding in Hydra– Organisms like hydra use regenerative cells for reproduction by the process of budding. The first step in this process is the formation of buds and then it develops as a small outgrowth on the parent’s body. As the bud develops, it receives the characteristics of the parent organism.
3. List out the important topics covered in NCERT Solutions for Chapter 9 of Class 8 Science?
The following topics have been covered in NCERT Solutions for Chapter 9 of Class 8 Science:
Modes of Reproduction (Sexual and Asexual)
Male and Female Reproductive Organs
Fertilization
Development of an Embryo
Viviparous and Oviparous animals
Asexual Reproduction (Budding and Binary Fission)
With the help of NCERT Solutions, you will learn all about these concepts so that acing your exams becomes a cakewalk.
4. What is the advantage of using the NCERT Solutions for Chapter 9 of Class 8 Science provided by Vedantu?
NCERT Solutions for Chapter 9 of Class 8 Science provided by Vedantu are the best choice to understand the Chapter ‘Reproduction in Animals’. The experts curate these solutions at Vedantu to provide the most accurate, high-quality answers to clarify all their doubts and answer the questions in the exams with ease. Solutions at Vedantu are curated by experts and are available free of cost.
5. What is Reproduction? Why is Reproduction an important topic of Chapter 9 of Class 8 Science?
Reproduction is the procedure through which a living organism produces more of its kind. Reproduction helps to continue their generation. It is important to study and understand in Class 8 that if there is no reproduction, no living thing can continue to survive. To understand the concepts related to Reproduction and its importance, you must know the basic points as included in the NCERT Solutions for Chapter 9 of Class 8 Science by Vedantu. These are guaranteed to help you to clear your concepts easily and effectively.
6. What is reproduction in animals? Short answer.
Reproduction in animals is the process used by organisms to produce offspring like them. For a better idea of the concept of reproduction and how to write short answers on that topic, refer to NCERT Solutions for Chapter 9 Reproduction in Animals of Class 8 Science at free of cost on the Vedantu website and on the Vedantu app. This will help you to understand the concepts easily and clearly. With the help of the NCERT solutions by Vedantu, you can write down the answers effectively for the exams.
7. What is fertilization, according to Chapter 9 of Class 8 NCERT?
The fusing of the male gamete with the female gamete to form a zygote with the process of sexual reproduction is referred to as fertilization.
Fertilization has been explained in depth in the NCERT Solutions for Chapter 9 of Class 8 Science by Vedantu. If you want to get a good grip of the topics and score well in the exam, it is advisable to download these solutions for quick reference.