Water makes up approximately what proportion of the fresh mass of a typical living cell?
Correct answer: D. 70 to 90 per cent
- A. about 10 per cent
- B. about 30 per cent
- C. about 50 per cent
- D. 70 to 90 per cent
Explanation
Most cells are between seventy and ninety per cent water, which is why it is treated as the medium of life rather than as one nutrient among others. Every metabolic reaction occurs in aqueous solution, water is itself a reactant in hydrolysis and a product of condensation, and it transports dissolved substances. Seeds and spores are the low water exceptions, and their metabolism is correspondingly almost stopped.
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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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