SEBA Class 8 Science Chapter 12 Reproduction of Animals Solutions English Medium to each chapter is provided in the list so that you can easily browse through different chapters SEBA Class 8 Science Chapter 12 Reproduction of Animals Question Answer and select need one. SEBA Class 8 Science Chapter 12 Reproduction of Animals Solutions Download PDF. SEBA Class 8 Science Texbook Solutions English Medium.
SEBA Class 8 Science Chapter 12 Reproduction of Animals
Also, you can read the NCERT book online in these sections Solutions by Expert Teachers as per Central Board of Secondary Education (CBSE) Book guidelines. SEBA Class 8 General Science Textual Solutions in English are part of All Subject Solutions. Here we have given Class 8 Science Textbook Question Answer, SEBA Class 8 Science English Medium Textbook Solutions for All Chapters, You can practice these here.
Reproduction of Animals
Chapter: 12
PART – II
EXERCISE
1. Explain the importance of reproduction in organisms.
Ans: (i) Reproduction is essential for the continuation of species.
(ii) It helps in replacing old and dying organisms with new ones.
(iii) It also ensures the transfer of genetic traits to the next generation.
2. Describe the process of fertilisation in human beings.
Ans: In humans, fertilisation happens when the sperm from the male meets the egg from the female. This usually occurs inside the female body. The sperm and egg fuse to form a single cell called the zygote, which later develops into a baby.
3. Choose the most appropriate answer.
(a) Internal fertilisation occurs:
(i) In female body.
(ii) Outside female body.
(iii) In male body.
(iv) Outside male body.
Ans: (i) In female body.
(b) A tadpole develops into an adult frog by the process of:
(i) Fertilisation.
(ii) Metamorphosis.
(iii) Embedding.
(iv) Budding.
Ans: (ii) Metamorphosis.
(c) The number of nuclei present in a zygote is:
(i) None.
(ii) One.
(iii) Two.
(iv) Four.
Ans: (ii) one.
4. Indicate whether the following statements are True (T) or False (F).
(a) Oviparous animals give birth to young ones. ()
Ans: False.
(b) Each sperm is a single cell. ()
Ans: True.
(c) External fertilisation takes place in frog. ()
Ans: True.
(d) A new human individual develops from a cell called gamete. ()
Ans: False.
(e) Egg laid after fertilisation is made up of a single cell. ()
Ans: True.
(f) Amoeba reproduces by budding. ()
Ans: False.
(g) Fertilisation is necessary even in asexual reproduction. ()
Ans: False.
(h) Binary fission is a method of asexual reproduction. ()
Ans: True.
(i) A zygote is formed as a result of fertilisation. ()
Ans: True.
(j) An embryo is made up of a single cell. ()
Ans: False.
5. Give two differences between a zygote and a foetus.
Ans:
| Zygote | Foetus |
| A single cell formed by fertilisation. | A developed stage of the embryo with body parts. |
| It is the beginning stage of life. | It looks like a baby and is in the mother’s womb. |
6. Define asexual reproduction. Describe two methods of asexual reproduction in animals.
Ans: Asexual reproduction is the process in which an animal reproduces without the involvement of another organism (no fertilisation).
Two methods are:
Binary fission: The parent cell divides into two, e.g., Amoeba.
Budding: A small part of the body grows out and becomes a new organism, e.g., Hydra.
7. In which female reproductive organ does the embryo get embedded?
Ans: The embryo gets embedded in the uterus of the female body. After fertilisation, the zygote (the single-cell formed by the fusion of sperm and egg) starts dividing and forms an embryo. This embryo travels through the fallopian tube and reaches the uterus, which is a soft, muscular organ in the female body.
The inner lining of the uterus is thick and has a good blood supply, which helps the embryo attach itself and grow safely into a baby.
8. What is metamorphosis? Give examples.
Ans: Metamorphosis is the process in which an animal changes its body form completely from a young stage to an adult stage.
Examples: Frog, Butterfly.
9. Differentiate between internal fertilisation and external fertilisation.
Ans:
| Internal Fertilisation | External Fertilisation |
| Happens inside the female body | Happens outside the female body |
| Example: Humans, dogs, cats | Example: Frogs, fishes |
10. Complete the crossword puzzle using the hints given below.
Across:
1. The process of the fusion of the gametes.
6. The type of fertilisation 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 fertilised egg.
4. These animals lay eggs.
5. A type of fission in amoeba.
Ans: Across:
(i) Fertilisation.
(vi) Internal.
(vii) Buds.
(viii) Ovary.
Down:
(ii) Testes.
(iii) Zygote.
(iv) Oviparous.
(v) Binary.
Hi! my Name is Parimal Roy. I have completed my Bachelor’s degree in Philosophy (B.A.) from Silapathar General College. Currently, I am working as an HR Manager at Dev Library. It is a website that provides study materials for students from Class 3 to 12, including SCERT and NCERT notes. It also offers resources for BA, B.Com, B.Sc, and Computer Science, along with postgraduate notes. Besides study materials, the website has novels, eBooks, health and finance articles, biographies, quotes, and more.
