Question

Cactus spines are modified stems branches leaves.

Humans have pores in their skin to sweat and cool off the body. Plants have similar structures called _____.
pores
tendrils
stomata
receptacles

Answer 1

Stomata:

These pores tend to be open during the day and are very important in the cooling of the leaves. This is done by water from the transpiration stream evaporating from the stomata. Due to water's high latent heat of vaporisation, the same concepts that humans incorporate when sweating, the plant leaf is cooled.