THESE NOTES ARE PREPARED ACCORDING TO JKBOSE SYLLABI IN SIMPLIFIED AND CONCISE PATTERN
Exercises
Q. 1 Explain the importance of reproduction in animals?
Ans: Reproduction helps living organisms to produce young ones like them. It helps them to carry on their generation.
Q.2 Describe the process of fertilization in human beings?
Ans: Fertilization occurs when sperm from male fuses with egg from female.
This results in the formation of zygote.
The Zygote develops into embryo which later forms a baby.
In humans, internal fertilization takes place.
Q. 3 Choose the appropriate answer.
(a) External Fertilization occurs
(i)in female body.
(ii) outside female body.
(iii) in male body.
(iv) outside male body.
Ans: (i)Outside female body.
(b) A tadpole develops into an adult frog by the process of
(i) fertilization.
(ii) metamorphosis.
(iii) embedding.
(iv) budding.
Ans: (ii) Metamorphosis.
(c) The number of nuclei present in zygote is
(i) none. (ii) one.
(iii) two. (iv) four.
Ans: (ii) one.
Q.4 Indicate whether following statements are true or false
a. Oviparous animals give birth to young ones
Ans: FALSE
Ans: Reproduction helps living organisms to produce young ones like them. It helps them to carry on their generation.
Q.2 Describe the process of fertilization in human beings?
Ans: Fertilization occurs when sperm from male fuses with egg from female.
This results in the formation of zygote.
The Zygote develops into embryo which later forms a baby.
In humans, internal fertilization takes place.
Q. 3 Choose the appropriate answer.
(a) External Fertilization occurs
(i)in female body.
(ii) outside female body.
(iii) in male body.
(iv) outside male body.
Ans: (i)Outside female body.
(b) A tadpole develops into an adult frog by the process of
(i) fertilization.
(ii) metamorphosis.
(iii) embedding.
(iv) budding.
Ans: (ii) Metamorphosis.
(c) The number of nuclei present in zygote is
(i) none. (ii) one.
(iii) two. (iv) four.
Ans: (ii) one.
Q.4 Indicate whether following statements are true or false
a. Oviparous animals give birth to young ones
Ans: FALSE
b. Each sperm is a single cell
ANS: TRUE
c. External fertilization takes place in frog
ANS: TRUE
d. A new individual develops from a cell called gamate
ANS: FALSE
e. Egg layed after fertilization is made up of single cell
ANS: TRUE
f. Amoeba reproduces by budding
ANS: FALSE
g. Fertilization 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 fertilization
ANS: TRUE
j. An embryo is made of single cell
ANS: FALSE
Q. 5 Give two differences between zygote and Foetus
Ans: Zygote is single celled whereas Foetus has lakhs of cells,
Zygote is first stage of development of baby whereas Foetus is final stage of development of baby
Q.6 Define asexual reproduction? Describe two methods of asexual reproduction in animals.
Ans: Asexual reproduction is the type of reproduction in which only one parent is involved in reproduction.
In this type of reproduction, gamates are not produced.
There are many methods of asexual reproduction e.g;
Binary Fission: In binary fission, a single cell divides into two daughter cells. It occurs in bacteria.
Budding: In budding, a bud grows on the body which develops into new organism. It occurs in hydra.
Q.7 In which female reproductive organ does embryo get embedded?
Ans: The embryo gets embedded in the uterus of females. The embryo develops into foetus there.
Q.8 What is metamorphosis? Give examples.
Ans: Metamorphosis is a change in the body structure and shape of some living organisms.
In metamorphosis, a larve develops into an adult.
It occurs in Frogs, Butterflies etc.
Q.9 Differentiate between Internal Fertilization and External Fertilization?
Ans:
Internal External
Fertilizationtakes place|Fertilization takes
Inside the body | place outside body
Less number of eggs | Large number of
are produced |eggs are produced
E.g, Cow, Humans | Eg, Fishes, Frogs
Q.10 Complete the cross word using hints
Across
[ ] The process of fusion of gamates
[ ] The term used for bulges in hydra
[ ] Eggs are produced her
Below
[ ] Sperms are produced here
[ ] Another term for fertilized egg
[ ] These animals lay eggs
[ ] A type of fission in amoeba
F E R T I L I Z A T I O N
E Y V
S G I B
T O P I
E T A N
B U D S E R A
O V A R Y
U Y
S
Inside the body | place outside body
Less number of eggs | Large number of
are produced |eggs are produced
E.g, Cow, Humans | Eg, Fishes, Frogs
Q.10 Complete the cross word using hints
Across
[ ] The process of fusion of gamates
[ ] The term used for bulges in hydra
[ ] Eggs are produced her
Below
[ ] Sperms are produced here
[ ] Another term for fertilized egg
[ ] These animals lay eggs
[ ] A type of fission in amoeba
F E R T I L I Z A T I O N
E Y V
S G I B
T O P I
E T A N
B U D S E R A
O V A R Y
U Y
S
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