Higher turgor pressure in a plant cell is maintained by________________?
Correct answer: D. both b and c
- A. Large number of vacoules in a plant cell.
- B. Higher ionic concentration inside vacuoles resulting from active pumping of ions at their tonoplastic membrane
- C. Higher osmotic pressure of the cell vacuole
- D. both b and c
Explanation
Active pumping of ions into the vacuole increases its solute concentration and therefore its osmotic pressure, drawing in water and raising turgor pressure. Both the higher ionic concentration and the resulting higher osmotic pressure are involved, so option d is correct; choosing only c misses the ion-pumping mechanism.
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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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