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Stomata on the surface of the leaf open by

1. Decreasing the solute concentration in the guard cells.
2. Increasing the solute concentration in the guard cells.
3. Increasing the water potential in the guard cells.
4. Both B and C.

Correct answer: Increasing the solute concentration in the guard cells.

Solution

Stomata open when guard cells become turgid. This occurs after solute concentration in the guard cells increases, which lowers their water potential so water enters by osmosis. The resulting turgor pressure bends the guard cells apart and opens the pore.

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