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प्रश्न
Fill in the blank
Aquatic plants and animals use _________ in water.
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उत्तर
Aquatic plants and animals use dissolved oxygen in the water.
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संबंधित प्रश्न
State three uses of water vapour in the air.
Tick (√) the most appropriate answer.
The humans pollute the air by :
What do you understand by the term polluted air?
Write ‘True’ or ‘False’ in front of following statement.
The catalyst used in laboratory preparation of oxygen gas from hydrogen peroxide gas is magnesium oxide
Write fully balanced equation for the following :
Ca(OH)2 + CO2 →
Give word equation for the following conversion:
Nitric acid to soluble nitrates in the soil
Name the main component of air.
Observe the picture given in figure carefully and answer the following questions.
- What is covering the nose and mouth of the police man?
- Why is he putting a cover on his nose?
- Can you comment on air quality of the place shown in the figure?
Explain the following observations very briefly
Breathing through mouth may harm you.
Write just a few sentences for an imaginary situation if any of the following gases disappear from the atmosphere.
Oxygen
