Question

Stomata open during day time, because the guard cells

• A. Prepare osmotically active sugars or organic acids by photosynthesis
• B. Are thin-walled
• C. Are bean shaped
• D. Have to help in gaseous exchange

Answer 1

The correct option is A Prepare osmotically active sugars or organic acids by photosynthesis

Guard cells have chloroplast in contrast to the cells of epidermis, which do not have chloroplast. The chloroplast in the guard cells on exposure to light carry out process of photosynthesis. The synthesis of sugars in guard cells is related to movement of guard cells.