Class 8 Science

  • NCERT Solutions Class 8 Science Reaching the Age of Adolescence

    NCERT Solutions for Class 8 Science for chapter 10 Reaching the Age of Adolescence Exercises Question-1 What is the term used for secretions of endocrine glands responsible for changes taking place in the body? Answer: The term used for secretions of endocrine glands responsible for changes taking...

  • NCERT Solutions Class 8 Science Reproduction in Animals

    NCERT Solutions for Class 8 Science for chapter 9 Reproduction in Animals Exercises Question-1 Explain the importance of reproduction in organisms. Answer: Importance of reproduction in organisms is: 1. Reproduction ensures the continuity of a species.2. It also maintains the number of individuals...

  • NCERT Solutions Class 8 Science Cell Structure and Functions

    NCERT Solutions for Class 8 Science for chapter 8 Cell Structure and Functions Exercises Question-1 Indicate whether the following statements are true (T) or false (F). a) Unicellular organisms have one-celled body. (T/F)b) Musclecells are branched. (T/F)c) The basic living unit of an organism is...

  • NCERT Solutions Class 8 Science Microorganisms Friends and Foe

    NCERT Solutions for Class 8 Science for chapter 2 Microorganisms Friends and Foe Exercises Question-1 Fill in the blanks: a) Microorganisms can be seen with the help of a _____b) Blue-green algae fix ____ directly from air to enhance fertility of soil.c) Alcohol is produced with the help of ____. d...

  • NCERT Solutions Class 8 Science Crop production and management

    NCERT Solutions for Class 8 Science for chapter 1 Crop production and management Exercises Question- 1. Select the following word from the following list and fill in the blanks Float, water, crop, nutrients, preparation a) The same kind of plants grown and cultivated on a large scale at a place is...

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NCERT Solutions Class 8 Science Reaching the Age of Adolescence

NCERT Solutions for Class 8 Science for chapter 10 Reaching the Age of Adolescence

Exercises

Question-1 What is the term used for secretions of endocrine glands responsible for changes taking place in the body?

Answer: The term used for secretions of endocrine glands responsible for changes taking place in the body is hormones. Hormones are the chemical substances that are directly released into blood steam by the endocrine glands.


Question-2 Define adolescence.

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NCERT Solutions Class 8 Science Reproduction in Animals

NCERT Solutions for Class 8 Science for chapter 9 Reproduction in Animals

Exercises

Question-1 Explain the importance of reproduction in organisms.

Answer: Importance of reproduction in organisms is:

1. Reproduction ensures the continuity of a species.
2. It also maintains the number of individuals in a populatio
3. It is also responsible for variations in organisms in a population that help them to survive in the environment.

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NCERT Solutions Class 8 Science Cell Structure and Functions

NCERT Solutions for Class 8 Science for chapter 8 Cell Structure and Functions

Exercises

Question-1 Indicate whether the following statements are true (T) or false (F).

a) Unicellular organisms have one-celled body. (T/F)
b) Musclecells are branched. (T/F)
c) The basic living unit of an organism is an organ. (T/F)
d) Amoeba has irregular shape. (T/F)

Answer:

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NCERT Solutions Class 8 Science Microorganisms Friends and Foe

NCERT Solutions for Class 8 Science for chapter 2 Microorganisms Friends and Foe

Exercises

Question-1 Fill in the blanks:

a) Microorganisms can be seen with the help of a _____
b) Blue-green algae fix ____ directly from air to enhance fertility of soil.
c) Alcohol is produced with the help of ____.
d) Cholera is caused by ____

Answer:

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NCERT Solutions Class 8 Science Crop production and management

NCERT Solutions for Class 8 Science for chapter 1 Crop production and management

Exercises

Question- 1. Select the following word from the following list and fill in the blanks

Float, water, crop, nutrients, preparation

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NCERT Solutions Class 8 Science Pollution of Air and Water

NCERT Solutions for Class 8 Science for chapter 18 Pollution of Air and Water

Question - 1 - What are the different ways in which water gets contaminated?

Answer.

Water gets contaminated by following ways:

(1) Excessive amount of pesticides and fertilisers are being used to increase crop production. These chemicals are carried away to the water bodies by rains and floods which contaminate water.

(2) Harmful chemicals discharged from industries pollute water bodies.

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NCERT Solutions Class 8 Science Combustion and Flame

NCERT Solutions for Class 8 Science for chapter 6 Combustion and Flame

Question - 1 - List conditions under which combustion can take place.

Answer.

Necessary conditions for combustion are:

(1) Fuel: Fuel is the raw material for combustion.

(2) Air: Combustion takes place only in the presence of air or oxygen.

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NCERT Solutions Class 8 Science Coal and Petroleum

NCERT Solutions for Class 8 Science for chapter 5 Coal and Petroleum

Question - 1 - What are advantages of using CNG and LPG as fuels?

Answer.

The advantages of using CNG and LPG as fuels are as follows:

(1) They can be easily transport through pipe lines.
(2) They can be used directly for burning in homes and factories.
(3) Both are clean fuels.
(4) Both CNG and LPG are used as fuel by vehicles because they are less polluting.

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NCERT Solutions Class 8 Science Materials Metals and Non-Metals

NCERT Solutions for Class 8 Science fopr chapter 4 Materials Metals and Non-Metals

Question.1 - Which of the following can be beaten into sheets? 

(a) Zinc

(b) Phosphorous

(c) Sulphur

(d) Oxygen

Answer.

Correct option is (a) Zinc.

Explanation: Generally metals can be beaten into sheets. Zinc is metal while phosphorus, sulphur and oxygen are non-metals.

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NCERT Solutions Class 8 Science Synthetic fibres and plastics

NCERT Solutions for Class 8 Science for chapter 3 Synthetic fibres and plastics

Question.1 Explain why some fibres are called synthetic. 

Answer.

Man-made fibres are called synthetic fibres. These fibres are prepared from petrochemicals with the help of various processes. Examples of some synthetic fibres are nylon, rayon, polyester, acrylic, etc.

Question.2 Mark (Y) the correct answer.

Rayon is different from synthetic fibres because

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