Q. Consider the following two statements and select the correct option.
Statement I: The stomatal pore, guard cells and the surrounding subsidiary cells are together called stomatal aperture.
Statement II : The outer walls of guard cells are highly thickened and the inner walls are thin.

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Solution:

• The stomatal pore, guard cells and the surrounding subsidiary cells are together called stomatal apparatus.
• The outer walls of guard cells (away from stomatal pore) are thin and the inner walls (towards the stomatal pore) are highly thickened.