YEAR 7 SCIENCE
This week, Year 7 have been looking at the structure of a leaf and the cells involved in the vital process of photosynthesis. We have spent time viewing leaves under magnifying glasses and microscopes, observing the layers of cells within a leaf. They have also discovered that leaves use chlorophyll and light energy to convert carbon dioxide and water into glucose, which acts as a source of food for the plant. This glucose is stored as starch. We wanted to prove that photosynthesis occurred by removing chlorophyll from a leaf using boiling ethanol, and testing it for the presence of stored starch using iodine.
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