Question

What are the small pores on the under surface of the leaves called?

Answer 1

Small pores present at the lower surface of plants are called "Stromata".  

Stoma or stomata are small pores like opening at the lower surface of plants that helps in the exchanges of gases. These stomata are guarded by cells called guard cells.  

Stomata are present mainly on the epidermis of a plant and other parts like stem. In case of dicotyledons these small pores are abundant at the lower side of the leaves than the upper side.

Answer 2

Stomata is the answer

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