Gaseous Exchange
Gaseous Exchange
Gaseous Exchange:
Respiration and Gaseous Exchange in Animals: We know that animals obtain energy from food they eat. Before the energy can be used by the cells of the body, it must be released from the chemicals of the food by respiration. We have seen that aerobic respiration needs a supply of oxygen to breakdown the food which releases energy. During respiration animal cells produce carbon dioxide as a waste product. All cells, therefore, must be supplied oxygen and must be able to get rid of carbon dioxide. 
To show that Carbon dioxide is released During Exhalation:
Carbon dioxide reacts with lime water to make calcium carbonate. This property is utilized to show the evolution of carbon dioxide during respiration. For this, take a test tube and pour some lime water in it. Dip a drinking straw in the test tube. Blow air in the lime water turns milky. This shows that carbon dioxide is released during exhalation.
Which of the following are correct ? (a) In unicellular organisms, simple diffusion through body surface is sufficient for exchange of gases necessary for respiration because the cell is in continuous contact with the external environment. (b) In simple multicellular organisms like poriferans and coelenterates, respiration occurs by simple diffusion because most of their cells are in contact with internal environment. (c) Humans a special system called as respiratory system is required for the exchange of gases. | |||
| Right Option : C | |||
| View Explanation | |||
Gaseous exchange in plants take place through ________ and ___________ . | |||
| Right Option : A | |||
| View Explanation |
What is the test for carbon dioxide gas? | |||
| Right Option : B | |||
| View Explanation | |||
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