Question

multiple - choice question
the stoma are guard cells that can...
open and close
stay closed
stay open

Explanation:

Stomata are tiny pores on the surface of plant leaves. Guard cells surround each stoma. Through changes in turgor pressure, guard cells can open (allowing gas exchange like intake of CO₂ and release of O₂ and water vapor) or close (to prevent excessive water loss, especially under conditions like high heat or drought). They don't always stay open or always stay closed as their opening - closing is a dynamic process regulated by various factors (e.g., light, hormone levels).

Answer:

Open and close