Class–VIII (CHAPTER-09) REPRODUCTION IN ANIMALS Questions
1. Explain the importance of reproduction in organism.
2. Describe the process of fertilisation in human beings.
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
(b) A tadpole develops into an adult frog by the process of i. Fertilisation.
ii. Metamorphosis iii. Embedding
iv. Budding
(c) The number of nuclei present in a zygote is i. None
ii. One iii. Two iv. Four
4. Idicate whether the following statements are True (T) or False
(F).
(a) Oviparous animals give birth to young one. ( ).
(b) Each sperm is a single cell. ( ).
(c) External fertilisation takes place in frog. ( ).
(d) A new human individual develops from a cell called gamete () (e) Egg laid after fertilisation is made up of a single cell ( ).
(f) Amoeba reproduces by budding. ( ).
(g) Fertilisation is necessary even in asexual reproduction. ( ). (h) Binary fission is a method of asexual reproduction. ( ).
(i) A zygote is formed as a result of fertilisation. ( ). (j) An embryo is made up of a single cell. ( ).
5. Give two differences between a zygote and Foetus
6. Define asexual reproduction. Describe two methods of asexual reproduction in animals.
7. In which female reproductive organ does the embryo get embedded?
8. What is metamorphosis? Give examples.
9. Differentiate between internal fertilisation and external fertilisation.
10. 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.
Class–VIII (CHAPTER-09) REPRODUCTION IN ANIMALS Answers
1. Reproduction is the important life process happens in each and every living organism. It is the process of production of the new individuals/offspring from the parents. Reproduction ensures the passage of traits and habits from generation to generation. reproduction is important for the continuity of the species on the earth. without reproduction the species will be vanished from the earth.
2. Human beings reproduce by formation and fusion of male and female gamates. Testis in male produces Sperm while ovary in female produces Ovum (Egg).
During copulation male releases sperms in the female reproductive tract. So, sperm being a motile will reach to Ovum in the fallopian tube. The male and female gamates fuses together in the fallopian tube. and the process of fusion is termed as fertilization. After the fertilization the end product is called a Zygote, which will become a foetus in the womb.
3. (a) (i) in female body. (b) (ii) metamorphosis. (c) (ii) one.
4. True/False
(a) (F) (f) (F) (b) (T) (g) (T)
(c) (T) (h) (T)
(d) (T) (i) (T)
(e) (T) (j) (F)
5. Zygote is the single cell resultant of fusion of ovum and sperm.
While the foetus is the much-developed form of zygote which has body parts and body organs.
Zygote is generally observed in the fallopian tube of the female, while the foetus is the much-developed version of a baby present in the uterus.
6. The type of reproduction in which only parent is involved is termed as asexual reproduction. 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: There is an outgrowth of the new progeny from the parent in the forms of bud. Eg: 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. Eg: Amoeba.
7. The embryo gets embedded in the wall of the uterus for further development.
8. Sudden change which happens in the animal while developing is called as metamorphosis.
The nimals that undergoes metamorphosis are
a. Silkworm (egg-> caterpillar-> pupa ->adult)
b. Frog (egg --> tadpole --> adult)
9.
Internal fertilisation External fertilisation
(i) The fertilisation takes place inside the female body.
(ii) Example- human beings, hen, dog etc. (i) The fertilisation takes place outside the body of female.
(ii) Example- frog, fish etc.
10.
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