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प्रश्न
Which gas in the atmosphere is essential for respiration?
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उत्तर
Oxygen is essential for respiration.
संबंधित प्रश्न
Answer the question put against the following constituents of air :
Oxygen : What is the percentage proportion of oxygen in air ? Why is oxygen called active air.
Statement given below is incorrect. Write the correct statement :
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Tick (√) the most appropriate answer.
A gas which dilutes the activity of oxygen in air is:
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Combustion.
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Name the following:
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Soda bottle bursts sometimes when it is opened during summer. Why?
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.
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- 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?
