Stomata open due to _________ of K+ into the guard cells from the surrounding epidermis
Correct answer: B. Active transport
- A. Diffusion
- B. Active transport
- C. Osmosis
- D. All of these
Explanation
Light activates ion transport mechanisms in guard cells, and K+ is accumulated from surrounding cells by active transport. The increased solute concentration lowers the guard cells' water potential, so water enters by osmosis and the stomata open. Students may choose osmosis because water movement follows K+ uptake, but osmosis moves water, not K+ into the guard cells.
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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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