Question

According to the sugar concentration theory, during daytime, the guard cells

• A. Bulge inward
• B. Bulge outward
• C. No bulging
• D. None of the above

Answer 1

The correct option is B Bulge outward

During the daytime, the guard cells become turgid and bulge outwards due to their thin outer walls, this widening the stomatal opening lying in between. During day time, photosynthesis occurs in the guard cells and glucose is produced. Creating an osmotic gradient, resulting in movement of water from adjacent cells into the guard cells.

The correct option is B.