What facilitates opening and closing of stomatal pores?

cbse
cbse-class-7-science
respiration-organism

#1

What facilitates opening and closing of stomatal pores?
Answer:
file stomatal pores are enclosed by two guard cells, which are surrounded by several subsidiary cells. All these three, namely stomatal pores, guard cells and subsidiary cells together constitute stomatal apparatus. The flow of the water into and out of guard cells facilitates closing and opening of stomatal pores. This results in the exchange of gases.