Question

the underside of a leaf has small openings called​

Answer 1

Explanation:

stomata

The only way for gases to diffuse in and out of the leaf is though small openings on the underside of the leaf, the stomata. These stomata can open and close according to the plant's needs. The tissues of the leaf in between the epidermal cells, into which gases diffuse from the stomata, are called mesophyll.

Answer 2

the underside of a leaf has small openings called pores that's stomata.