In the given figure of a stomatal apparatus, which component has thin outer walls and highly thickened inner walls?
D
A
B
C
The component described is the guard cell. According to the text, 'The outer walls of guard cells (away from the stomatal pore) are thin and the inner walls (towards the stomatal pore) are highly thickened' . These differential wall thickenings aid in the opening and closing of the stomatal pore.
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