Advertisements
Advertisements
प्रश्न
The components of air which are harmful to living beings are ______.
विकल्प
nitrogen and carbon dioxide.
dust and water vapour.
dust and smoke.
smoke and water vapour.
Advertisements
उत्तर
The components of air which are harmful to living beings are dust and smoke.
Explanation:
Dust and smoke are harmful to living beings because if they enter our body, they can cause respiratory problems.
APPEARS IN
संबंधित प्रश्न
Write ‘True’ or ‘False’ in front of following statement.
The trapping of solar heat energy in the earth’s atmosphere is called greenhouse effect.
Give the chemical name of rust.
Fill in the blank
Aquatic plants and animals use _________ in water.
Name the components of air with their approximate percentage by volume in air. Does the percentage by volume of each component remain the same, in the atmosphere of different parts of the world? Explain with reasons.
What is the source of carbon dioxide in air?
Explain why during an incident of fire, one is advised to wrap a woollen blanket over a burning object.
Soda bottle bursts sometimes when it is opened during summer. Why?
______ gas is essential for the proper growth of all plants.
Write the reaction of carbon dioxide with lime water.
Boojho took an empty plastic bottle, turned it upside down and dipped its open mouth into a bucket filled with water. He then tilted the bottle slightly and made the following observations.
- Bubbles of air came out from the bottle.
- Some water entered the bottle.
- Nitrogen gas came out in the form of bubbles and oxygen got dissolved in water.
- No bubbles formed, only water entered the bottle.
Which observations is/are correct?
