___________ function as multisensory hydraulic valve?
Correct answer: B. Guard cells
- A. Lenticels
- B. Guard cells
- C. Hydathods
- D. All of these
Explanation
Guard cells surround each stomatal pore and act as a turgor-controlled hydraulic valve, opening or closing the pore as water enters or leaves them. Lenticels and hydathodes are other plant structures involved in gas exchange or water release, but they do not regulate a pore through paired turgid cells in this way. Students may choose hydathodes because they are associated with water, but hydathodes release liquid water and are not the main controllers of stomatal opening.
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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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