Guard cells in a leaf
A) are a protection against herbivores.
B) control the exchange of gases and loss of water.
C) are epidermal cells without chloroplasts.
D) are connected directly to the vascular system.
E) secrete oil in eucalypts.

Question

Quizplus · Accepted Answer

Guard cells control the opening and closing of stomata, thereby regulating the exchange of gases (such as carbon dioxide and oxygen) and the loss of water vapor through transpiration in plants.

Guard Cells in a Leaf