This document discusses photosynthesis and an experiment to test for the presence of starch in leaves. It defines photosynthesis as the process where green plants absorb sunlight to produce food from carbon dioxide and water, releasing oxygen. Chlorophyll absorbs sunlight and the produced glucose is converted to starch. The experiment involves testing a leaf for one of photosynthesis's end products, starch. The leaf is boiled to soften it, immersed in alcohol to remove chlorophyll, and a precaution must be taken during the experiment.