The 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.
1. Which process is being tested in the activity? 2. What is the result of the activity? Give reasons. 
1.In which jar, will the amount of CO2 be the highest and why? 2. In which jar, will the amount of CO2 be the lowest and why?