1. Air is required for respiration: The correct proportions of nitrogen and oxygen are required for our respiration. A normal human being requires about 250 kg to 265 kg of air a day to carry out its normal activities. During respiration, we breathe in oxygen from the air and breathe out carbon dioxide. The inhaled oxygen combines with haemoglobin of our blood to form oxyhaemoglobin. The latter acts as the oxygen-carrier to the cells of our body. In the cell, oxygen oxidizes sugar molecules to produce carbon dioxide and water, and liberates heat energy. We use this energy to perform various works.
2. Air is required for burning of fuels: It is the oxygen of air that is essentially required for burning of things. Nothing will burn in the absence of oxygen. Fuels are mostly mixtures of hydrocarbons (compounds formed from the combination of carbon and hydrogen). When they burn in air, carbon dioxide and water vapour are produced with the release of heat energy.
Fuel + Oxygen Carbon Dioxide + Water Vapour + Energy
3. Plants require air to make their food: Plants require carbon dioxide of the air to make their food by a process called photosynthesis. In photosynthesis, green plants consume carbon dioxide and water vapour from the air and the energy of the sun to prepare sugar (food).
Which of the following is correct : (a) Air is required for respiration. (b) Air helps in the dispersal of seeds. | |||
Right Option : C | |||
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______________________ is required for burning materials . | |||
Right Option : D | |||
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Consider the following statement about inhaled air and exhaled air.
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Right Option : D | |||
View Explanation |
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