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प्रश्न
Compare respiration and combustion-both involving oxygen of the air.
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उत्तर
Respiration is a process whereby living organisms
- Use oxygen from the air to oxidize food substances mainly glucose, in their body cells.
- Release energy in the form of heat.
- Carbon dioxide and water vapour are also produced and released in the exhaled air.
\[\ce{Glucose + \underset{\text{(in air)}}{Oxygen} -> \underset{\text{Exhaled air}}{Carbon dioxide + Water vapour + Energy(heat)}}\]
Combustion or burning, involves oxidation i.e. combination of substances like fuels with oxygen or air generally resulting in the production of heat and light.
\[\ce{Fuel + \underset{\text{(in air)}}{Oxygen} ->Carbon dioxide + Water vapour + \underset{\text{(heat and light)}}{Energy}}\]
Carbon dioxide is released into the air as a result of all burning.
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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 reason:
When water is heated, we see bubbles rising up.
With the help of a labeled diagram, describe a simple experiment to show the presence of oxygen and nitrogen in air using a piece of white phosphorus.
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
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.
_______ can be seen moving in a beam of sunlight in a dark room.
How do the roots of land plants get oxygen for breathing?
The composition of air changes slightly from place to place. Give examples.
Give the components present in the air with a percentage?
