Reproduction in Animals - Worksheets

CBSE Worksheet-01
Class–VIII Science (Reproduction in Animals)

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1. For sexual reproduction number of parents required are :-
   1. only one
   2. two
   3. three
   4. four
2. Frogs are found to exhibit :-
   1. external fertilization
   2. sexual reproduction
   3. ovipary
   4. all the above
3. Offsprings produced by asexual reproduction are also called:-
   1. drones
   2. gametes
   3. zygotes
   4. clones
4. Binary fission can take place only in :-
   1. unicellular organisms
   2. prokaryotic cells
   3. eukaryotic cells
   4. multicellular organisms
5. Match the column :-

   a. Zygote	i) reproductive organ
   b. Sperm	ii) a clone
   c. Egg	iii) male gamete
   d. Flower	iv) female gamete
   e. Dolly	v) first cell of new organism

6. Fill in the blanks :-
   1. Because of ______ life continues from generation to generation.
   2. Bisexual organisms are also known as ______ .
   3. The process of fusion of sperm nucleus with egg nucleus is called ______ .
   4. ______ fertilization occurs in most of the aquatic organisms.
   5. ______ reproduction begins with fusion of male and female gametes.
7. Define an embryo? How is it different from zygote and foetus?
8. Which type of fertilization occurs in human beings ? How is human embryo development different from development of a hen’s embryo?
9. In the following life cycle label different stages as asked for :
   
10. Write the correct words by putting letters in correct sequence-
    1. noisfis
    2. dubnigd

CBSE Worksheet-01
Class–VIII Science (Reproduction in Animals)
[Answers]

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1. b
2. d
3. d
4. a
5. a. v, b. iii, c. iv, d. i, e. ii.
6. 1. reproduction
   2. hermaphrodites
   3. fertilization
   4. internal
   5. sexual.
7. An embryo is a ball of cells formed by the repeated cell divisions of zygote. It is a multicellular structure. A zygote is a single celled structure which represents the first cell of a new organism. It is formed by the fusion of male and female gametes. Embryo is the middle stage between zygote and foetus. Foetus is the stage of an embryo which starts resembling the features of a human being.
8. Both human beings and hen have internal fertilization. In this type of fertilization , the fusion of male and female gametes takes place inside the body of the female partner. But hens lay eggs while humans give birth to young ones. So, while the development of embryo into baby takes place inside the body of human female, the chick development occurs outside the body of hen.
9. 1. (top to bottom) late tadpole
   2. fertilized eggs
   3. early tadpoles.
10. 1. fission
    2. budding