English
Tamil Nadu Board of Secondary EducationTamil Nadu Primary School Class 4

Write the percentage of the gases present in air.

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Question

Write the percentage of the gases present in air.

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Solution

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Chapter 3: Air We Breathe - Activity 2 [Page 91]

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Samacheer Kalvi Science - Term 3 [English] Class 4 TN Board
Chapter 3 Air We Breathe
Activity 2 | Q 1 | Page 91

RELATED QUESTIONS

Answer the question put against the following constituents of air:

Nitrogen : Explain its significance for plants and animals.


Answer the question put against the following constituents of air :

Carbon dioxide : “Although carbon dioxide plays no role in respiration, all life would come to an end if there is no carbon dioxide in air.” Support this statement with relevant facts.


Fill in the blank space by choosing the correct word from the given list.
List: oxygen, carbonic, suIphurUioxide gas, precipitation, helium

_______ gas is used for filling weather observation balloons.


Fill in the blank space by choosing the correct word from the given list.
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Solution of carbon dioxide in water is called _________ acid.


Classify Carbon monoxide. Also give a balanced equation to prepare it.


What are the two necessary conditions for rusting of iron?


Match the statements in List 1 with the correct answers in List 2

List 1 List 2
1 An impurity in air A Water vapour
2 The component of air which supports combustion B Respiration
3 The inert component in the air slightly soluble in water C Rare gases
4 The component of air which minimizes the rate of evaporation D Sulphur dioxide
5 The process which involves oxidation of food substance in living organisms E Helium
6 The component of air which finds application in observation balloons F Carbon dioxide
7 The process which involves oxidation of substances, liberating heat and light energy G Combustion
8 The component of air which is heavier than air and fairly soluble in water H Nitrogen
9 The process by which atmospheric carbon dioxide is absorbed by plants resulting in the formation of carbohydrates I Photosynthesis
10 The component of air which is lighter than air and less than 1% in air J Oxygen

Name the following:

The product of respiration released in exhaled air, other than carbon dioxide.


A list of words is given in a box. Use appropriate words to fill up the blank in the following statement.

Mountaineers carry oxygen ______ with them, while climbing high mountains.


Explain the following observations very briefly

Breathing through mouth may harm you.


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