A stomatal apparatus comprises of:
A. A pair of guard cells, a stomatal pore, and surrounding subsidiary cells
B. A pair of stomata
C. A stoma
D. A pair of guard cells and a stomatal pore

Correct option is A

Correct Answer: (a)
Explanation:
A stomatal apparatus consists of a pair of guard cells, the stomatal pore between them, and in many plants, subsidiary cells surrounding the guard cells.
Information Booster:
Guard cells control opening and closing of the stoma through turgor changes.
The stomatal pore facilitates gaseous exchange and transpiration.
Subsidiary cells assist guard cells in mechanical movement.
Guard cells are kidney-shaped in dicots, dumbbell-shaped in monocots.
Opening and closing are regulated by osmotic movement of K⁺ ions and water.
Additional Information (Incorrect Statements):
(B) Incorrect — stomata are individual pores, not paired structures.
(C) Incorrect — a single stoma refers only to the pore.
(D) Incomplete — omits subsidiary cells, which are part of the full apparatus.