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प्रश्न
______ is the percentage of nitrogen in air.
पर्याय
78%
21%
0.03%
1%
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उत्तर
78% is the percentage of nitrogen in air.
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संबंधित प्रश्न
Answer the question put against the following constituents of air :
Water vapours : Explain their role in modifying the earth’s climate.
Give reason:
Aquatic animals and plants are able to survive in the matter.
Fill in the blank
Green plants need ________________to prepare food.
The diagrams below represents an experiment to show the presence of a component of air.
- State why air is sucked from – outlet ‘B’ and not from outlet “A”
- State why the air is sucked ‘slowly’ from the outlet “B”
- State the observation seen after completion of the experiment.
- State the reason for the above observation seen.
- Name another component which if present in air as a pollutant would have given a similar observation
State whether the following statement is ‘true’ or ‘false’. If false write the correct statement.
Photosynthesis is a process by which green plants prepare their own food in the presence of sunlight and chlorophyll.
How do the roots of land plants get oxygen for breathing?
______ present in the air is needed for respiration.
Venus's atmosphere consists of roughly 96 – 97% of ______.
Assertion: Carbon dioxide occurs as carbonates in nature.
Reason: Carbon dioxide can exist as a liquid at atmospheric pressure.
What is not true about air?
