A) A = Subsidiary cell, B = Epidermal cell, C Guard cell, D = Stomatal aperture.
B) A = Guard cell, B = Stomatal aperture, C Subsidiary cell, D = Epidermal cell.
C) A = Epidermal cell, B = Guard cell, C = Stomatal aperture, D = Subsidiary cell.
D) A = Epidermal cell, B = Subsidiary cell, C = Stomatal aperture, D = Guard cell.
Correct Answer: D
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