| 21. | Protection against sudden thermal change is carried out by help of |
| a. | water |
| b. | salt |
| c. | ions |
| d. | bonds |
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Answer: (a).water
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| 22. | Amino acids are composed of |
| a. | carbon, nitrogen and oxygen |
| b. | carbon, oxygen and sulfur |
| c. | carbon, oxygen and hydrogen |
| d. | carbon, oxygen, hydrogen and nitrogen |
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Answer: (d).carbon, oxygen, hydrogen and nitrogen
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| 23. | Most abundant carbohydrate which is found in nature is |
| a. | fructose |
| b. | glycogen |
| c. | cellulose |
| d. | pectin |
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Answer: (c).cellulose
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| 24. | Fats are solid due to presence of |
| a. | Saturated fatty acids |
| b. | unsaturated fatty acid |
| c. | glycerols |
| d. | ester bond |
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Answer: (a).Saturated fatty acids
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| 25. | Overall chemical reaction that takes place with in a cell are collectively called as |
| a. | metabolism |
| b. | anabolism |
| c. | complex reaction |
| d. | catabolism |
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Answer: (a).metabolism
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