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What is stomatal periodicity? What are the categories of stomata?

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Stomatal periodicity is the rate of opening and closing of stomata during day and night. Stomata usually open during day and close during night. 

There are three categories of stomata : 

(i) Barley or cereal type : They are dumb-bell shaped. The stomata usually open during the day for a few hours. 

(ii) Leuceme or alfalfa type : They open during day and close during night under mesophytic conditions. In succulents, the stomata remain closed during the day. They open only during night. 

iii) Potato Type : Under mesophytic conditions, the stomata can remain open through day and night but close down for different periods and at various times under less water availability.

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