NCERT Solutions for Class 8 Science Chapter 9 Reproduction in Animals
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NCERT Solutions for Class 8 Science Chapter 9 Reproduction in Animals
Detailed explanation provided under each NCERT solutions for Class 8 Science Chapter 9 will help in understanding the concepts better. It will let you explore answers of those questions which you're finding difficult to solve. Through these NCERT Solutions, a student can boost their preparation and assessment of understood concepts.
| Study Material for Class 8 Science Chapter 9 Reproduction in Animals |
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Page No: 110
Exercise
1. Explain the importance of reproduction in organisms.
Answer
Reproduction is very important for the organisms. The organisms reproduce to produce young ones like them. It helps to carry on their generation. If reproduction does not take place, no living being will survive on the earth. Had the process of reproduction not been there then all the plants and animals would have become extinct. Secondly, special characters of an organism are carried over to its next generation through reproduction only.
2. Describe the process of fertilization in human beings.
Answer
Fertilization involves the fusion of the male and the female gamete. The male and the female gametes are released from the male and the female reproductive organs. Sperms or male gametes are released from the male reproductive organ i.e., the penis. These sperms then enter the female body through the vagina. Then, they travel through the fallopian tubes where they meet the eggs. Hence, the process of fertilization takes place in the fallopian tubes. During fertilization, the haploid nucleus of the sperm and that of the ovum fuse with each other to form the zygote. This zygote divides to form an embryo which in turn develops into a foetus.
3. Choose the most appropriate answer.
(a) Internal fertilization occurs
(i) in female body.
(ii) outside female body.
(iii) in male body.
(iv) outside male body.
► (i) in female body.
(b) A tadpole develops into an adult frog by the process of
(i) fertilization
(b) A tadpole develops into an adult frog by the process of
(i) fertilization
(ii) metamorphosis
(iii) embedding
(iv) budding
(iii) embedding
(iv) budding
► (ii) metamorphosis
(c) The number of nuclei present in a zygote is
(i) none
(ii) one
(iii) two
(iv) four
► (ii) one(c) The number of nuclei present in a zygote is
(i) none
(ii) one
(iii) two
(iv) four
4. Indicate whether the following statements are True (T) or False (F).
(a) Oviparous animals give birth to young ones. ( )
► False
(b) Each sperm is a single cell. ( )
► True
(c) External fertilization takes place in frogs. ( )
(c) External fertilization takes place in frogs. ( )
► True
(d) A new human individual develops from a cell called gamete. ( )
(d) A new human individual develops from a cell called gamete. ( )
► Flase
(e) Egg laid after fertilization is made up of a single cell. ( )
(e) Egg laid after fertilization is made up of a single cell. ( )
► True
(f) Amoeba reproduces by budding. ( )
(f) Amoeba reproduces by budding. ( )
► False
(g) Fertilization is necessary even in asexual reproduction. ( )
(g) Fertilization is necessary even in asexual reproduction. ( )
► False
(h) Binary fission is a method of asexual reproduction. ( )
(h) Binary fission is a method of asexual reproduction. ( )
► True
(i) A zygote is formed as a result of fertilization. ( )
(i) A zygote is formed as a result of fertilization. ( )
► True
(j) An embryo is made up of a single cell. ( )
► False(j) An embryo is made up of a single cell. ( )
5. Give two differences between a zygote and a foetus.
Answer
Zygote
|
Foetus
|
| It is a fertilized egg formed after the fusion of the sperm with the egg. | It is a stage of the embryo that shows all the main recognizable body parts of a mature organism. |
| The zygote divides several times to form an embryo. | An embryo gradually develops into a foetus. |
6. Define asexual reproduction. Describe two methods of asexual reproduction in animals.
Answer
Asexual reproduction is that type of reproduction in which only single parent is involved. Asexual reproduction takes place by different methods like Budding, Binary fission etc.
→ Budding: This type of reproduction takes place in Hydra and Bacteria. A part of the organism starts bulging out. Slowly it grows and develops into a separate individual.
→ Binary fission – In this type of reproduction, a single organism gets divided into two. This type of reproduction takes place in Amoeba. The nucleus of the Amoeba gets divided into two followed by division of their bodies, each part getting one nucleus and developing into a separate individual.
7. In which female reproductive organ does the embryo get embedded?
Answer
The embryo gets embedded in the wall of the uterus.
7. In which female reproductive organ does the embryo get embedded?
Answer
The embryo gets embedded in the wall of the uterus.
8. What is metamorphosis? Give examples.
Answer
The transformation of the larva into adult through drastic changes is called metamorphosis. Frogs and insects are examples of organisms showing metamorphosis.
9. Differentiate between internal fertilization and external fertilization.
Answer
Internal
fertilization
|
External
fertilization
|
| It involves the fusion of the male and the female gamete inside the female body. | It involves the fusion of the male and the female gamete outside the female body. |
| Chances of the survival of the offspring are more. Therefore, a small number of eggs are produced. | Chances of survival of the offspring are less. Therefore, a large number of eggs are produced. |
| Humans, cows, hens are organisms showing internal fertilization. | Fish, frog, starfish are organisms showing external fertilization. |
Page No: 111
10. Complete the crossword puzzle using the hints given below.
Across
1. The process of the fusion of the gametes.
6. The type of fertilization in hen.
7. The 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.
Answer
1. FERTILIZATION
6. INTERNAL
7. BUDS
8. OVARY
Down
2. TESTIS
3. ZYGOTE
4. OVIPAROUS
5. BINARY
Go Back To NCERT Solutions for Class 9 Science
Chapter 9 Reproduction in Animals Class 8 Science NCERT Solutions
It is very challenging to score good marks in tests that is why we have prepared Chapter 9 NCERT Questions and Answers for Class 8 Science. You will develop the ability to identify what improvements and changes need to be made. NCERT Solutions is an effective method for learning since you can be le to learn a lot within a short time.
Class 8 Science Chapter 9 Reproduction in Animals NCERT Questions and Answers - Topics
• Modes of Reproduction
• Sexual Reproduction
→ Male Reproductive Organs
→ Female Reproductive Organs
→ Fertilisation
→ Development of Embryo
→ Viviparous and Oviparous Animals
→ Young Ones to Adults
• Asexual Reproduction
Chapter 9 Reproduction in Animals NCERT Solutions for Class 8 Science - Notes
• There are two modes by which animals reproduce:
(i) Sexual reproduction
(ii) Asexual reproduction
• In animals, males and females have different reproductive parts or organs. Like plants, the reproductive parts in animals also produce gametes that fuse to form a zygote. It is the zygote which develops into a new individual. This type of reproduction beginning from the fusion of male and female gametes is called sexual reproduction.
• The male reproductive organs include a pair of testes (singular, testis), two sperm ducts and a penis. The testes produce the male gametes called sperms. Sperms are very small in size, each has a head, a middle piece and a tail. Each sperm is a single cell with all the usual cell components.
• The female reproductive organs are a pair of ovaries, oviducts (fallopian tubes) and the uterus. Ovary produces female gametes called ova (eggs). In human beings, a single matured egg is released into the oviduct by one of the ovaries every month. Uterus is the part where development of the baby takes place. Like the sperm, an egg is also a single cell.
• The first step in the process of reproduction is the fusion of a sperm and an ovum. When sperms come in contact with an egg, one of the sperms may fuse with the egg. Such fusion of the egg and the sperm is called fertilization. During fertilization, the nuclei of the sperm and the egg fuse to form a single nucleus. This results in the formation of a fertilized egg or zygote.
→ The process of fertilization is the meeting of an egg cell from the mother and a sperm cell from the father. So, the new individual inherits some characteristics from the mother and some from the father.
→ Fertilization which takes place inside the female body is called internal fertilization.
→ In many animals fertilization takes place outside the body of the female. This type of fertilisation in which the fusion of a male and a female gamete takes place outside the body of the female is called external fertilisation. It is very common in aquatic animals such as fish, starfish, etc.
• Fertilisation results in the formation of zygote which begins to develop into an embryo. The embryo gets embedded in the wall of the uterus for further development. It gradually develops the body parts such as hands, legs, head, eyes, ears, etc. The stage of the embryo in which all the body parts can be identified is called a foetus.
→ In animals which undergo external fertilization, development of the embryo takes place outside the female body. The embryos continue to grow within their egg coverings. After the embryos develop, the eggs hatch.
• The animals which give birth to young ones are called viviparous animals. Those animals which lay eggs are called oviparous animals.
• The new individuals which are born or hatched from the eggs continue to grow till they become adults.
→ The transformation of the larva into an adult through drastic changes is called metamorphosis.
• In hydra, new individuals develop from buds. This method of asexual reproduction is called budding.
• Amoeba reproduces by dividing itself into two. This type of asexual reproduction is called binary fission.
Chapter 9 Reproduction in Animals Class 8 Science Questions and Answers - MCQ Questions with answers
1. The thread like structure present in nucleus of cell to carry traits to next generation is called
a) Sperm
b) Ovary
c) Chromosomes
d) Nucleolus
► c) Chromosomes
2. The cell formed after fertilisation is called
a) Foetus
b) Zygote
c) An embryo
d) None of the above
► b) Zygote
3. Tadpole is the developing stage of:
a) Dogs
b) Cats
c) Frogs
d) Human
► c) Frogs
4. Which of the following is not true of the process of reproduction?
a) Unicellular organisms cannot reproduce.
b) Reproduction is the process of producing young animals or plants.
c) Reproduction is one of the life processes of living things.
d) Reproduction is of two types, sexual and asexual reproduction.
► a) Unicellular organisms cannot reproduce.
5. Sperm and ovum are
a) Tissues
b) Single celled
c) Paired cells
d) Multicellular
► b) Single celled
6. Foetus is the
a) Well developed embryo
b) Developing embryo
c) A zygote
d) Male gamete
► a) Well developed embryo
7. In asexual reproduction
a) No parents are involved
b) Four parents are involved
c) One parent is involved
d) Two parents are involved
► c) One parent is involved
8. The modes of reproduction in animals are
a) Only one type
b) Two types
c) Three types
d) Four types.
► b) Two types
9. The copulatory organ human male is called
a) Testes
b) Vas deference
c) Oviduct
d) Penis
► d) Penis
10. Which part within the uterus prevents the mixing of the blood of the foetus with that of the mother?
a) Umbilical cord
b) Uterus wall
c) Placenta
d) Water sac
► c) Placenta
These Chapter 9 Class 8 Science NCERT Solutions are curated by the experts in a comprehensive which can be helpful in clearing your doubts instantly. It will be useful in expanding student's horizon as it cover variety of questions. You can pinpoint your weaknesses with the help of these NCERT Solutions for Class 8 Science and prepare accordingly to change it in a positive way.