Drop a pebble into the bag so that the bag hangs down. Use a twist tie to securely close the plastic bag around the twig. Examine the plastic bag after 24 hours. Carefully pour the water from the plastic bag into a measuring cup. Divide the amount of water by the number of leaves enclosed by the plastic bag to estimate how much water would transpire from one leaf.
Humans sweat to stay cool, so do plants.
Plants release this water through a process called transpiration and because of this process plants are able to keep or release the right amount of water to stay healthy. This book contains a variety of science activities and questions. Oozing,Bubbling,Dripping,and Bouncing Experiments. This book contains many science activities that include plants. CD-Roms Eyewitness Encyclopedia of Nature 2.0.