Question

On the basis of daily periodically, stomatal movements are of

• A. Four types
• B. Three types
• C. Two types
• D. Five types

Answer 1

The correct option is D Five types

Stomata open during day and close at night. There are five categories on the basis of daily stomatal movement. These are alfalfa type, barley type, potato type, equisetum type and succulent type. In barley or cereal type, stomata remain open only for a few hours in day and remain closed in rest period. In alfalfa or lucerne type, stomata remain open during the day and close during night. In potato type, stomata remain open during day and night except few hours in evening. In equisetum type, stomata seldom close. In succulent type, stomata remain open during during night time and closed during daytime.

Thus, the correct answer is option D.