Sample Solution Paper 2 - Term- 2 Science, Class 8 Class 8 Notes | EduRev

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Class 8 : Sample Solution Paper 2 - Term- 2 Science, Class 8 Class 8 Notes | EduRev

 Page 1


  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
CBSE Board 
Class VIII Science 
Sample Paper – 2 Solution 
Term II 
 
SECTION A 
 
1. (c) 
The skin of snakes is in great demand for making fancy leather goods. Snake skin is sold 
at a high price in the market. Therefore, for easy money, snakes are killed 
indiscriminately to obtain their skin. 
 
2. (a) 
Mammary glands develop inside the breasts.  
 
3. (a) 
External fertilisation takes in all of these animals as the fusion of male and female 
gamete takes place outside the female body in them.  
 
4. (a) 
The Golgi body in plants is not well developed and is called as dictyosome.  
 
5. (a) 
Species whose numbers are diminishing to such a low level that they may face 
extinction soon are known as endangered species. Species which no longer exist 
anywhere on the Earth are called extinct species. Flying squirrel, black buck and snow 
leopard are examples of endangered species, while the dodo is an example of an extinct 
species. 
 
6. (a) 
Water is not suitable to control fire caused by burning oil because it sinks below the oil, 
and oil keeps burning on top. For fires involving materials like oil, a carbon dioxide fire 
extinguisher is the best controlling agent. 
 
7. (c) 
Synthetic fibres have high resistance to abrasion. 
 
8.  (b) 
Increasing levels of CO 2 is the main cause of global warming.  
 
9. (c) 
Silkmoth provides us with silk fibres whereas pearl oyster provides us with pearl. 
Page 2


  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
CBSE Board 
Class VIII Science 
Sample Paper – 2 Solution 
Term II 
 
SECTION A 
 
1. (c) 
The skin of snakes is in great demand for making fancy leather goods. Snake skin is sold 
at a high price in the market. Therefore, for easy money, snakes are killed 
indiscriminately to obtain their skin. 
 
2. (a) 
Mammary glands develop inside the breasts.  
 
3. (a) 
External fertilisation takes in all of these animals as the fusion of male and female 
gamete takes place outside the female body in them.  
 
4. (a) 
The Golgi body in plants is not well developed and is called as dictyosome.  
 
5. (a) 
Species whose numbers are diminishing to such a low level that they may face 
extinction soon are known as endangered species. Species which no longer exist 
anywhere on the Earth are called extinct species. Flying squirrel, black buck and snow 
leopard are examples of endangered species, while the dodo is an example of an extinct 
species. 
 
6. (a) 
Water is not suitable to control fire caused by burning oil because it sinks below the oil, 
and oil keeps burning on top. For fires involving materials like oil, a carbon dioxide fire 
extinguisher is the best controlling agent. 
 
7. (c) 
Synthetic fibres have high resistance to abrasion. 
 
8.  (b) 
Increasing levels of CO 2 is the main cause of global warming.  
 
9. (c) 
Silkmoth provides us with silk fibres whereas pearl oyster provides us with pearl. 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
10. (b) 
In rural areas, dumping of untreated sewage causes water pollution.  
 
11. (c) 
When more than one force acts on an object, the effect on the object is due to the net 
force acting on it. 
 
12. (a) 
When charged bodies are brought into contact, the charge on one body can be 
transferred to another body. This is called charge transfer by conduction. When Hari 
touches the metal strip, the charges on the aluminium leaves get transferred to his 
hand, through the strip. At the same time, the hand loses the charges to the Earth, 
through the body. This process continues until all the charges from the leaves get 
transferred to the Earth. Hence, the aluminium leaves become uncharged, move toward 
each other, and become relaxed.  
 
13. (c) 
A periscope is used in submarines, tanks and also by soldiers in bunkers to see things 
outside. 
 
14. (a) 
The angle between the orbital and equatorial planes of the Earth is 23.5
o
. 
 
15. (c) 
Friction is necessary to write. We are able to write on paper because there is friction 
between the tip of the pencil (or pen) and paper. 
 
SECTION B 
 
16.   
i. The nucleus controls all the life processes taking place inside the cell. 
ii. It also helps in the transmission of hereditary characteristics from one generation to 
another. 
 
17.  The sperm is the male gamete produced by the testes. It is a single cell with all the 
usual cell components. It is very small in size. Each sperm has a head, a middle piece 
and a tail. 
 
 
18. Seeds do not germinate under dry conditions. Irrigation of crop fields provides 
sufficient moisture for the germination of seeds.  
 
Page 3


  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
CBSE Board 
Class VIII Science 
Sample Paper – 2 Solution 
Term II 
 
SECTION A 
 
1. (c) 
The skin of snakes is in great demand for making fancy leather goods. Snake skin is sold 
at a high price in the market. Therefore, for easy money, snakes are killed 
indiscriminately to obtain their skin. 
 
2. (a) 
Mammary glands develop inside the breasts.  
 
3. (a) 
External fertilisation takes in all of these animals as the fusion of male and female 
gamete takes place outside the female body in them.  
 
4. (a) 
The Golgi body in plants is not well developed and is called as dictyosome.  
 
5. (a) 
Species whose numbers are diminishing to such a low level that they may face 
extinction soon are known as endangered species. Species which no longer exist 
anywhere on the Earth are called extinct species. Flying squirrel, black buck and snow 
leopard are examples of endangered species, while the dodo is an example of an extinct 
species. 
 
6. (a) 
Water is not suitable to control fire caused by burning oil because it sinks below the oil, 
and oil keeps burning on top. For fires involving materials like oil, a carbon dioxide fire 
extinguisher is the best controlling agent. 
 
7. (c) 
Synthetic fibres have high resistance to abrasion. 
 
8.  (b) 
Increasing levels of CO 2 is the main cause of global warming.  
 
9. (c) 
Silkmoth provides us with silk fibres whereas pearl oyster provides us with pearl. 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
10. (b) 
In rural areas, dumping of untreated sewage causes water pollution.  
 
11. (c) 
When more than one force acts on an object, the effect on the object is due to the net 
force acting on it. 
 
12. (a) 
When charged bodies are brought into contact, the charge on one body can be 
transferred to another body. This is called charge transfer by conduction. When Hari 
touches the metal strip, the charges on the aluminium leaves get transferred to his 
hand, through the strip. At the same time, the hand loses the charges to the Earth, 
through the body. This process continues until all the charges from the leaves get 
transferred to the Earth. Hence, the aluminium leaves become uncharged, move toward 
each other, and become relaxed.  
 
13. (c) 
A periscope is used in submarines, tanks and also by soldiers in bunkers to see things 
outside. 
 
14. (a) 
The angle between the orbital and equatorial planes of the Earth is 23.5
o
. 
 
15. (c) 
Friction is necessary to write. We are able to write on paper because there is friction 
between the tip of the pencil (or pen) and paper. 
 
SECTION B 
 
16.   
i. The nucleus controls all the life processes taking place inside the cell. 
ii. It also helps in the transmission of hereditary characteristics from one generation to 
another. 
 
17.  The sperm is the male gamete produced by the testes. It is a single cell with all the 
usual cell components. It is very small in size. Each sperm has a head, a middle piece 
and a tail. 
 
 
18. Seeds do not germinate under dry conditions. Irrigation of crop fields provides 
sufficient moisture for the germination of seeds.  
 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
19. In most of the cases, carbon dioxide is released during burning of fuels. Carbon dioxide 
is a green house gas. It causes an increase in the temperature of the Earth by trapping 
the Sun's heat rays and thus, causes global warming.  
 
20. Wood is used as firewood or turned into charcoal and used for cooking and heating 
purposes. Obtaining wood for fuel leads to deforestation. Due to deforestation, there 
will be no wood left for human use in a few years. 
 
21.  Sound cannot travel in vacuum because sound travels by producing a vibration in the 
molecules of the medium surrounding it, and there are no molecules in vacuum.  
 
22. Ursa Major is called as Saptarishi because it has seven prominent stars.  
 
SECTION C 
23.  
(a)  
i. During puberty, the shoulders of boys become broader and their chest becomes 
wider. 
ii. The muscles of boys also become more prominent during puberty.  
(b)  The secretion from the sweat and sebaceous glands increases during puberty. This 
causes acne and pimples on the face of boys and girls during this age.  
 
24.  Structure of sperm 
 
 
  
Page 4


  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
CBSE Board 
Class VIII Science 
Sample Paper – 2 Solution 
Term II 
 
SECTION A 
 
1. (c) 
The skin of snakes is in great demand for making fancy leather goods. Snake skin is sold 
at a high price in the market. Therefore, for easy money, snakes are killed 
indiscriminately to obtain their skin. 
 
2. (a) 
Mammary glands develop inside the breasts.  
 
3. (a) 
External fertilisation takes in all of these animals as the fusion of male and female 
gamete takes place outside the female body in them.  
 
4. (a) 
The Golgi body in plants is not well developed and is called as dictyosome.  
 
5. (a) 
Species whose numbers are diminishing to such a low level that they may face 
extinction soon are known as endangered species. Species which no longer exist 
anywhere on the Earth are called extinct species. Flying squirrel, black buck and snow 
leopard are examples of endangered species, while the dodo is an example of an extinct 
species. 
 
6. (a) 
Water is not suitable to control fire caused by burning oil because it sinks below the oil, 
and oil keeps burning on top. For fires involving materials like oil, a carbon dioxide fire 
extinguisher is the best controlling agent. 
 
7. (c) 
Synthetic fibres have high resistance to abrasion. 
 
8.  (b) 
Increasing levels of CO 2 is the main cause of global warming.  
 
9. (c) 
Silkmoth provides us with silk fibres whereas pearl oyster provides us with pearl. 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
10. (b) 
In rural areas, dumping of untreated sewage causes water pollution.  
 
11. (c) 
When more than one force acts on an object, the effect on the object is due to the net 
force acting on it. 
 
12. (a) 
When charged bodies are brought into contact, the charge on one body can be 
transferred to another body. This is called charge transfer by conduction. When Hari 
touches the metal strip, the charges on the aluminium leaves get transferred to his 
hand, through the strip. At the same time, the hand loses the charges to the Earth, 
through the body. This process continues until all the charges from the leaves get 
transferred to the Earth. Hence, the aluminium leaves become uncharged, move toward 
each other, and become relaxed.  
 
13. (c) 
A periscope is used in submarines, tanks and also by soldiers in bunkers to see things 
outside. 
 
14. (a) 
The angle between the orbital and equatorial planes of the Earth is 23.5
o
. 
 
15. (c) 
Friction is necessary to write. We are able to write on paper because there is friction 
between the tip of the pencil (or pen) and paper. 
 
SECTION B 
 
16.   
i. The nucleus controls all the life processes taking place inside the cell. 
ii. It also helps in the transmission of hereditary characteristics from one generation to 
another. 
 
17.  The sperm is the male gamete produced by the testes. It is a single cell with all the 
usual cell components. It is very small in size. Each sperm has a head, a middle piece 
and a tail. 
 
 
18. Seeds do not germinate under dry conditions. Irrigation of crop fields provides 
sufficient moisture for the germination of seeds.  
 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
19. In most of the cases, carbon dioxide is released during burning of fuels. Carbon dioxide 
is a green house gas. It causes an increase in the temperature of the Earth by trapping 
the Sun's heat rays and thus, causes global warming.  
 
20. Wood is used as firewood or turned into charcoal and used for cooking and heating 
purposes. Obtaining wood for fuel leads to deforestation. Due to deforestation, there 
will be no wood left for human use in a few years. 
 
21.  Sound cannot travel in vacuum because sound travels by producing a vibration in the 
molecules of the medium surrounding it, and there are no molecules in vacuum.  
 
22. Ursa Major is called as Saptarishi because it has seven prominent stars.  
 
SECTION C 
23.  
(a)  
i. During puberty, the shoulders of boys become broader and their chest becomes 
wider. 
ii. The muscles of boys also become more prominent during puberty.  
(b)  The secretion from the sweat and sebaceous glands increases during puberty. This 
causes acne and pimples on the face of boys and girls during this age.  
 
24.  Structure of sperm 
 
 
  
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
25. We can prevent the spread of diseases, such as malaria and dengue, in the following 
ways:  
(i) Pools of stagnant water around the houses should be drained out so that 
mosquitoes do not breed in them.  
(ii) The windows and doors of the house should have a fine iron wire mesh so that 
mosquitoes cannot enter the house.  
(iii) Insecticides should be sprayed in the house periodically to kill mosquitoes.  
(iv) Oil should be sprayed on the surface of water in dirty water drains to kill the 
larvae of mosquitoes.  
(v) Mosquito-repellent creams should be applied on the exposed parts of the body 
before sleeping at night. Mosquito-repellent devices can also be used.  
 
26. A chemical process in which a substance reacts with the oxygen (present in the air) to 
give heat and light is called combustion. 
The different types of combustion are: 
1. Rapid combustion - The combustion reaction in which a large amount of heat and 
light are produced in a short time is called rapid combustion. For example, the 
burning of a wax candle. 
2. Spontaneous combustion - The combustion reaction which occurs on its own i.e. 
without the help of any external heat is called spontaneous combustion. For 
example, the burning of white phosphorus on its own at room temperature. 
3. Explosion - A very fast combustion reaction, in which a large amount of heat, light 
and sound are produced, is called an explosion (explosive combustion). For 
example, fireworks exploded during festivals. 
 
27.  
(i) Some fungi reproduce by the spore formation. When these spores settle on food 
items such as dry fruits; results in the growth of fungus which spoils the dry fruits. 
Hence, to avoid the entry of such spores, the dry fruits are sold in sealed, airtight 
packets. 
(ii) Action of microorganisms on food spoils the food. If such spoiled food is consumed, 
it may lead to food poisoning. When bacteria and fungi come in contact with food, they 
start decomposition activities which results in release of certain chemical toxins which 
contaminate the food. consumption of spolit food may cause serious illness and food 
poisoning. Hence, to avoid such instances, we preserve food properly. 
 
  
Page 5


  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
CBSE Board 
Class VIII Science 
Sample Paper – 2 Solution 
Term II 
 
SECTION A 
 
1. (c) 
The skin of snakes is in great demand for making fancy leather goods. Snake skin is sold 
at a high price in the market. Therefore, for easy money, snakes are killed 
indiscriminately to obtain their skin. 
 
2. (a) 
Mammary glands develop inside the breasts.  
 
3. (a) 
External fertilisation takes in all of these animals as the fusion of male and female 
gamete takes place outside the female body in them.  
 
4. (a) 
The Golgi body in plants is not well developed and is called as dictyosome.  
 
5. (a) 
Species whose numbers are diminishing to such a low level that they may face 
extinction soon are known as endangered species. Species which no longer exist 
anywhere on the Earth are called extinct species. Flying squirrel, black buck and snow 
leopard are examples of endangered species, while the dodo is an example of an extinct 
species. 
 
6. (a) 
Water is not suitable to control fire caused by burning oil because it sinks below the oil, 
and oil keeps burning on top. For fires involving materials like oil, a carbon dioxide fire 
extinguisher is the best controlling agent. 
 
7. (c) 
Synthetic fibres have high resistance to abrasion. 
 
8.  (b) 
Increasing levels of CO 2 is the main cause of global warming.  
 
9. (c) 
Silkmoth provides us with silk fibres whereas pearl oyster provides us with pearl. 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
10. (b) 
In rural areas, dumping of untreated sewage causes water pollution.  
 
11. (c) 
When more than one force acts on an object, the effect on the object is due to the net 
force acting on it. 
 
12. (a) 
When charged bodies are brought into contact, the charge on one body can be 
transferred to another body. This is called charge transfer by conduction. When Hari 
touches the metal strip, the charges on the aluminium leaves get transferred to his 
hand, through the strip. At the same time, the hand loses the charges to the Earth, 
through the body. This process continues until all the charges from the leaves get 
transferred to the Earth. Hence, the aluminium leaves become uncharged, move toward 
each other, and become relaxed.  
 
13. (c) 
A periscope is used in submarines, tanks and also by soldiers in bunkers to see things 
outside. 
 
14. (a) 
The angle between the orbital and equatorial planes of the Earth is 23.5
o
. 
 
15. (c) 
Friction is necessary to write. We are able to write on paper because there is friction 
between the tip of the pencil (or pen) and paper. 
 
SECTION B 
 
16.   
i. The nucleus controls all the life processes taking place inside the cell. 
ii. It also helps in the transmission of hereditary characteristics from one generation to 
another. 
 
17.  The sperm is the male gamete produced by the testes. It is a single cell with all the 
usual cell components. It is very small in size. Each sperm has a head, a middle piece 
and a tail. 
 
 
18. Seeds do not germinate under dry conditions. Irrigation of crop fields provides 
sufficient moisture for the germination of seeds.  
 
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
19. In most of the cases, carbon dioxide is released during burning of fuels. Carbon dioxide 
is a green house gas. It causes an increase in the temperature of the Earth by trapping 
the Sun's heat rays and thus, causes global warming.  
 
20. Wood is used as firewood or turned into charcoal and used for cooking and heating 
purposes. Obtaining wood for fuel leads to deforestation. Due to deforestation, there 
will be no wood left for human use in a few years. 
 
21.  Sound cannot travel in vacuum because sound travels by producing a vibration in the 
molecules of the medium surrounding it, and there are no molecules in vacuum.  
 
22. Ursa Major is called as Saptarishi because it has seven prominent stars.  
 
SECTION C 
23.  
(a)  
i. During puberty, the shoulders of boys become broader and their chest becomes 
wider. 
ii. The muscles of boys also become more prominent during puberty.  
(b)  The secretion from the sweat and sebaceous glands increases during puberty. This 
causes acne and pimples on the face of boys and girls during this age.  
 
24.  Structure of sperm 
 
 
  
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
25. We can prevent the spread of diseases, such as malaria and dengue, in the following 
ways:  
(i) Pools of stagnant water around the houses should be drained out so that 
mosquitoes do not breed in them.  
(ii) The windows and doors of the house should have a fine iron wire mesh so that 
mosquitoes cannot enter the house.  
(iii) Insecticides should be sprayed in the house periodically to kill mosquitoes.  
(iv) Oil should be sprayed on the surface of water in dirty water drains to kill the 
larvae of mosquitoes.  
(v) Mosquito-repellent creams should be applied on the exposed parts of the body 
before sleeping at night. Mosquito-repellent devices can also be used.  
 
26. A chemical process in which a substance reacts with the oxygen (present in the air) to 
give heat and light is called combustion. 
The different types of combustion are: 
1. Rapid combustion - The combustion reaction in which a large amount of heat and 
light are produced in a short time is called rapid combustion. For example, the 
burning of a wax candle. 
2. Spontaneous combustion - The combustion reaction which occurs on its own i.e. 
without the help of any external heat is called spontaneous combustion. For 
example, the burning of white phosphorus on its own at room temperature. 
3. Explosion - A very fast combustion reaction, in which a large amount of heat, light 
and sound are produced, is called an explosion (explosive combustion). For 
example, fireworks exploded during festivals. 
 
27.  
(i) Some fungi reproduce by the spore formation. When these spores settle on food 
items such as dry fruits; results in the growth of fungus which spoils the dry fruits. 
Hence, to avoid the entry of such spores, the dry fruits are sold in sealed, airtight 
packets. 
(ii) Action of microorganisms on food spoils the food. If such spoiled food is consumed, 
it may lead to food poisoning. When bacteria and fungi come in contact with food, they 
start decomposition activities which results in release of certain chemical toxins which 
contaminate the food. consumption of spolit food may cause serious illness and food 
poisoning. Hence, to avoid such instances, we preserve food properly. 
 
  
  
 
CBSE  VIII ¦SCIENCE 
Sample Paper – 2 Solution 
 
     
28.  
(a) The gases which can trap the Sun's heat rays in the Earth's atmosphere by 
producing greenhouse effect leading up to the heating of the Earth's atmosphere are 
called greenhouse gases. 
(b) Undue increase in temperature of the Earth's atmosphere due to excessive 
greenhouse effect is called global warming. The green house gases such as CO 2, 
water vapours, methane etc. form a thick layer around the Earth. When the heat rays 
coming from the Sun fall on the Earth's surface, some of these rays are absorbed by 
the Earth and some are reflected back. The cover of greenhouse gases does not 
allow these reflected heat rays to leave the Earth's atmosphere completely. This 
effect keeps the Earth's atmosphere warm. Rising amount of CO 2 causes more and 
more heat rays to be trapped in the Earth's atmosphere. This results in excessive 
heating of the Earth's atmosphere, and therefore, an increase in temperature. This 
results in global warming. 
 
29.  
(a) The components are: 
1. Battery 
2. Leads or wires 
3. Key 
4. Bulb/LED/magnetic compass 
(b) Some good conductors are: 
1. Common salt in water 
2. Hydrochloric acid in water 
3. Copper sulphate in water 
They all are solutions of acid, base or salt in water. 
 
30.  
(a) Cataract is a condition in which the eye lens becomes cloudy and the eyesight 
becomes blurred. It can be treated by surgery. The opaque lens is removed and a 
new artificial lens is inserted. 
(b) The iris is a dark muscular structure which gives the eye its distinct colours. It 
controls the amount of light entering into the eye. 
 
31.  
(i)  
(a)The gravitational force of the earth keeps us bound to the earth. 
(b)Gravitational force between earth and sun makes the earth move around the sun. 
(c)Gravitational force between moon and earth makes the moon go around the earth. 
(ii) Yes, muscular force needs to be in contact with the body on which it acts, so it is a 
contact force. 
 
 
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