In living organisms the lubricant which provides protection against damage resulting from friction is___________?
Correct answer: C. Water
- A. Carbohydrates
- B. Fatty acid
- C. Water
- D. Protein
Explanation
Water acts as a lubricant in joints and other body surfaces, reducing friction and protecting tissues from mechanical damage. The likely alternative is protein, because collagen and other proteins support joints, but they are not the main lubricating substance.
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About Biological Importance of Water
Water supports life through its polarity, hydrogen bonding and ability to dissolve ionic and polar substances. Its high specific heat, heat of vaporization, cohesion, adhesion and incompressibility help regulate temperature, transport materials and maintain structure, while hydrolysis and osmosis depend directly on water.
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