Notes : Reproduction In Animals Class 8 Notes | EduRev

Created by: Paras Saxena

Class 8 : Notes : Reproduction In Animals Class 8 Notes | EduRev

 Page 1


BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034 
         CORE  ASSIGNMENT- CLASS8-BIOLOGY 
            REPRODUCTION IN ANIMALS 
VERY SHORT ANSWER TYPE QUESTIONS:- 
I. Tick the correct option:- 
1. Internal fertilization occurs  
(a)in female body (b)outside female body   
(c)in male body     (d) outside male body 
Ans- (a)in female body 
2.    A tadpole develops into an adult by the process of 
(a)fertilization  (b)metamorphosis 
(c)embedding  (d)budding 
Ans- (b)metamorphosis 
3. The number of nuclei in the zygote is 
(a)none  (b)one  (c)two  (d)four 
Ans-(b)one 
II. Fill in the blanks:- 
1. Puberty  is the state of onset of sexual maturity in human beings. 
2. Reproduction  is very important for continuation of a species. 
3. The zygote  repeatedly divides to form an embryo. 
SHORT ANSWER TYPE QUESTIONS:- 
1. Explain the following terms:- 
(a) Reproduction- The process of giving rise to new organisms of the same species. 
(b) Fertilization-The fusion of male & female gametes. 
(c) Zygote- The single-celled structure formed on the fusion of male & female gametes. 
(d) Metamorphosis- The gradual transformation of an organism from one form to another 
during its life cycle 
Page 2


BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034 
         CORE  ASSIGNMENT- CLASS8-BIOLOGY 
            REPRODUCTION IN ANIMALS 
VERY SHORT ANSWER TYPE QUESTIONS:- 
I. Tick the correct option:- 
1. Internal fertilization occurs  
(a)in female body (b)outside female body   
(c)in male body     (d) outside male body 
Ans- (a)in female body 
2.    A tadpole develops into an adult by the process of 
(a)fertilization  (b)metamorphosis 
(c)embedding  (d)budding 
Ans- (b)metamorphosis 
3. The number of nuclei in the zygote is 
(a)none  (b)one  (c)two  (d)four 
Ans-(b)one 
II. Fill in the blanks:- 
1. Puberty  is the state of onset of sexual maturity in human beings. 
2. Reproduction  is very important for continuation of a species. 
3. The zygote  repeatedly divides to form an embryo. 
SHORT ANSWER TYPE QUESTIONS:- 
1. Explain the following terms:- 
(a) Reproduction- The process of giving rise to new organisms of the same species. 
(b) Fertilization-The fusion of male & female gametes. 
(c) Zygote- The single-celled structure formed on the fusion of male & female gametes. 
(d) Metamorphosis- The gradual transformation of an organism from one form to another 
during its life cycle 
(e) Hermaphrodites-The organisms having both male & female reproductive organs in the same 
body. Eg:- Earthworm, Leech 
(f) Foetus- The multicellular structure formed after the repeated cell divisions in the Zygote 
formed as a result of fertilization. 
(g) Larva- The active form that emerges from the eggs . 
(h) Placenta- The specialized tissue that attaches the developing foetus to the uterine wall & 
provides for it nourishment, respiration & excretion. 
 
2. Give reasons for the following:- 
(a) Gender of the resulting offspring is determined by the male parent in humans. 
Ans- The Y-chromosome bearing sperm that fertilizes an ovum results in a male offspring. 
The X-chromosome bearing sperm that fertilizes an ovum results in a female offspring. 
 
(b) Sex hormones regulate secondary sexual characters. 
Ans- The functioning of our reproductive organs is regulated by the sex hormones and one 
of the functions is the appearance of secondary sexual characters at puberty. 
 
(c) Platypus & Echidna lay eggs but are not oviparous animals. 
Ans- They lay eggs but feed the young ones on milk through the mammary glands. 
 
(d) Sperm needs to have motility.  
Ans – Sperms have to enter  the female reproductive passage and fertilize the ovum by 
travelling through the vagina & uterus for this in the fallopian tube/ oviduct. 
 
 
LONG ANSWER TYPE QUESTIONS:- 
1. Explain where  the embryo stays till it is fully developed and also explain how its nutritional , 
respiratory & excretory functions are carried out. 
Ans- The embryo gets attached to the uterine wall through the Placenta which is a specialized 
tissue richly supplied by blood & takes care of all the developmental functions of the developing 
embryo- nutrition, respiration & excretion.  
2. What is Asexual reproduction? What are the advantages of this method? 
Ans- The mode of reproduction that involves  a single organisms & also doesn’t require any 
special organs or cells. Its advantages are:- 
(a) Offsprings produced are identical to the parents so desired traits can be transmitted to the 
next generation 
(b) A quick method of reproduction 
Page 3


BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034 
         CORE  ASSIGNMENT- CLASS8-BIOLOGY 
            REPRODUCTION IN ANIMALS 
VERY SHORT ANSWER TYPE QUESTIONS:- 
I. Tick the correct option:- 
1. Internal fertilization occurs  
(a)in female body (b)outside female body   
(c)in male body     (d) outside male body 
Ans- (a)in female body 
2.    A tadpole develops into an adult by the process of 
(a)fertilization  (b)metamorphosis 
(c)embedding  (d)budding 
Ans- (b)metamorphosis 
3. The number of nuclei in the zygote is 
(a)none  (b)one  (c)two  (d)four 
Ans-(b)one 
II. Fill in the blanks:- 
1. Puberty  is the state of onset of sexual maturity in human beings. 
2. Reproduction  is very important for continuation of a species. 
3. The zygote  repeatedly divides to form an embryo. 
SHORT ANSWER TYPE QUESTIONS:- 
1. Explain the following terms:- 
(a) Reproduction- The process of giving rise to new organisms of the same species. 
(b) Fertilization-The fusion of male & female gametes. 
(c) Zygote- The single-celled structure formed on the fusion of male & female gametes. 
(d) Metamorphosis- The gradual transformation of an organism from one form to another 
during its life cycle 
(e) Hermaphrodites-The organisms having both male & female reproductive organs in the same 
body. Eg:- Earthworm, Leech 
(f) Foetus- The multicellular structure formed after the repeated cell divisions in the Zygote 
formed as a result of fertilization. 
(g) Larva- The active form that emerges from the eggs . 
(h) Placenta- The specialized tissue that attaches the developing foetus to the uterine wall & 
provides for it nourishment, respiration & excretion. 
 
2. Give reasons for the following:- 
(a) Gender of the resulting offspring is determined by the male parent in humans. 
Ans- The Y-chromosome bearing sperm that fertilizes an ovum results in a male offspring. 
The X-chromosome bearing sperm that fertilizes an ovum results in a female offspring. 
 
(b) Sex hormones regulate secondary sexual characters. 
Ans- The functioning of our reproductive organs is regulated by the sex hormones and one 
of the functions is the appearance of secondary sexual characters at puberty. 
 
(c) Platypus & Echidna lay eggs but are not oviparous animals. 
Ans- They lay eggs but feed the young ones on milk through the mammary glands. 
 
(d) Sperm needs to have motility.  
Ans – Sperms have to enter  the female reproductive passage and fertilize the ovum by 
travelling through the vagina & uterus for this in the fallopian tube/ oviduct. 
 
 
LONG ANSWER TYPE QUESTIONS:- 
1. Explain where  the embryo stays till it is fully developed and also explain how its nutritional , 
respiratory & excretory functions are carried out. 
Ans- The embryo gets attached to the uterine wall through the Placenta which is a specialized 
tissue richly supplied by blood & takes care of all the developmental functions of the developing 
embryo- nutrition, respiration & excretion.  
2. What is Asexual reproduction? What are the advantages of this method? 
Ans- The mode of reproduction that involves  a single organisms & also doesn’t require any 
special organs or cells. Its advantages are:- 
(a) Offsprings produced are identical to the parents so desired traits can be transmitted to the 
next generation 
(b) A quick method of reproduction 
(c) Only one parent organism is required, no special organs or cells also required. 
3. Explain the meaning of Binary Fission. Name  a few organisms that reproduce like this & draw a 
series of diagrams to demonstrate this process in Amoeba. 
Ans- The method by which an organism divides into two equal halves . 
Other organisms are:- Paramecium, Euglena, Bacteria. Refer to figure 9.12 of NCERT 
4. Explain how budding occurs.  Name a few organisms that reproduce like this & draw a series of 
diagrams to demonstrate this process in Hydra. 
Ans- Small bulges appear on the sides of the body of the organisms that gradually develop into 
new organisms. 
Sponges & Yeast besides Hydra. Refer to figure 9.11 of NCERT 
5. What is Metamorphosis? With the help of flow diagrams illustrate the life cycles of a Silkworm & 
Frog. 
Ans- Metamorphosis- The gradual transformation of an organism from one form to another 
during its life cycle. 
Silkworm:- Egg- ?Larva/ Caterpillar- ?Pupa/ Cocoon- ? Adullt 
Frog:- Egg- ? Tadpole(Larva)- ? Froglet- ? Adult Frog 
6. Draw a well labeled diagram showing binary fission in amoeba. 
 
 
 
 
 
Page 4


BAL BHARATI PUBLIC SCHOOL, PITAMPURA, DELHI-110034 
         CORE  ASSIGNMENT- CLASS8-BIOLOGY 
            REPRODUCTION IN ANIMALS 
VERY SHORT ANSWER TYPE QUESTIONS:- 
I. Tick the correct option:- 
1. Internal fertilization occurs  
(a)in female body (b)outside female body   
(c)in male body     (d) outside male body 
Ans- (a)in female body 
2.    A tadpole develops into an adult by the process of 
(a)fertilization  (b)metamorphosis 
(c)embedding  (d)budding 
Ans- (b)metamorphosis 
3. The number of nuclei in the zygote is 
(a)none  (b)one  (c)two  (d)four 
Ans-(b)one 
II. Fill in the blanks:- 
1. Puberty  is the state of onset of sexual maturity in human beings. 
2. Reproduction  is very important for continuation of a species. 
3. The zygote  repeatedly divides to form an embryo. 
SHORT ANSWER TYPE QUESTIONS:- 
1. Explain the following terms:- 
(a) Reproduction- The process of giving rise to new organisms of the same species. 
(b) Fertilization-The fusion of male & female gametes. 
(c) Zygote- The single-celled structure formed on the fusion of male & female gametes. 
(d) Metamorphosis- The gradual transformation of an organism from one form to another 
during its life cycle 
(e) Hermaphrodites-The organisms having both male & female reproductive organs in the same 
body. Eg:- Earthworm, Leech 
(f) Foetus- The multicellular structure formed after the repeated cell divisions in the Zygote 
formed as a result of fertilization. 
(g) Larva- The active form that emerges from the eggs . 
(h) Placenta- The specialized tissue that attaches the developing foetus to the uterine wall & 
provides for it nourishment, respiration & excretion. 
 
2. Give reasons for the following:- 
(a) Gender of the resulting offspring is determined by the male parent in humans. 
Ans- The Y-chromosome bearing sperm that fertilizes an ovum results in a male offspring. 
The X-chromosome bearing sperm that fertilizes an ovum results in a female offspring. 
 
(b) Sex hormones regulate secondary sexual characters. 
Ans- The functioning of our reproductive organs is regulated by the sex hormones and one 
of the functions is the appearance of secondary sexual characters at puberty. 
 
(c) Platypus & Echidna lay eggs but are not oviparous animals. 
Ans- They lay eggs but feed the young ones on milk through the mammary glands. 
 
(d) Sperm needs to have motility.  
Ans – Sperms have to enter  the female reproductive passage and fertilize the ovum by 
travelling through the vagina & uterus for this in the fallopian tube/ oviduct. 
 
 
LONG ANSWER TYPE QUESTIONS:- 
1. Explain where  the embryo stays till it is fully developed and also explain how its nutritional , 
respiratory & excretory functions are carried out. 
Ans- The embryo gets attached to the uterine wall through the Placenta which is a specialized 
tissue richly supplied by blood & takes care of all the developmental functions of the developing 
embryo- nutrition, respiration & excretion.  
2. What is Asexual reproduction? What are the advantages of this method? 
Ans- The mode of reproduction that involves  a single organisms & also doesn’t require any 
special organs or cells. Its advantages are:- 
(a) Offsprings produced are identical to the parents so desired traits can be transmitted to the 
next generation 
(b) A quick method of reproduction 
(c) Only one parent organism is required, no special organs or cells also required. 
3. Explain the meaning of Binary Fission. Name  a few organisms that reproduce like this & draw a 
series of diagrams to demonstrate this process in Amoeba. 
Ans- The method by which an organism divides into two equal halves . 
Other organisms are:- Paramecium, Euglena, Bacteria. Refer to figure 9.12 of NCERT 
4. Explain how budding occurs.  Name a few organisms that reproduce like this & draw a series of 
diagrams to demonstrate this process in Hydra. 
Ans- Small bulges appear on the sides of the body of the organisms that gradually develop into 
new organisms. 
Sponges & Yeast besides Hydra. Refer to figure 9.11 of NCERT 
5. What is Metamorphosis? With the help of flow diagrams illustrate the life cycles of a Silkworm & 
Frog. 
Ans- Metamorphosis- The gradual transformation of an organism from one form to another 
during its life cycle. 
Silkworm:- Egg- ?Larva/ Caterpillar- ?Pupa/ Cocoon- ? Adullt 
Frog:- Egg- ? Tadpole(Larva)- ? Froglet- ? Adult Frog 
6. Draw a well labeled diagram showing binary fission in amoeba. 
 
 
 
 
 
7. Draw a well labeled diagram of female reproductive system of human beings. 
 
 
8. Draw a welled diagram showing budding in hydra. 
 
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