Question 3 of 3

In the stomatal apparatus diagram shown, opening and closing of the stomatal pore is primarily regulated by turgor pressure changes in the:

ASubsidiary cellsBTrichomesCGuard cellsDEpidermal cells

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Answer: (C) Guard cells

When guard cells swell due to inflow of water ($K^+$ influx), the outer thin wall bulges outwards, pulling open the inner thick wall of the pore.

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