To explain the functioning and the major components of hydrologic cycle. To demonstrate how transpiration rates can be experimentally manipulated. To increase the students' awareness of how important all components of an ecosystem are in the proper maintenance of our atmosphere. Stopper with one hole for control. Pipette or syringe to which the rubber tubing can be attached at the delivery end.
Ring stand with clamp.
Pipette bulb or syringe. Plastic bag and rubber band. Connect the tubing to the delivery end of the pipette. Push the other end onto one leg of the L-shaped glass tube. Carefully push the other end of the glass tube into one hole of the two -hole stopper, the end must extend at least 2 cm. through the stopper.