Green plants use chlorophyll in their chloroplasts to photosynthesize, which is the process of using light energy to convert carbon dioxide and water into oxygen and starch. Photosynthesis occurs through chlorophyll trapping light energy in the chloroplasts of plant cells to power the chemical reaction that changes carbon dioxide and water into starch and oxygen.

1. Leaf Structure and
Photosynthesis

2. Photosynthesis
• Green plants (producers) can use light
energy to make their own food
• This process is called photosynthesis
• Green plants are green because they
contain a chemical called chlorophyll. This
chemical is used to trap light energy.

3. • Chlorophyll is contained in the chloroplasts
of plant cells
• Light energy is used to change carbon
dioxide and water into starch and oxygen
• The word equation for photosynthesis is
carbon + water starch + oxygen
dioxide
Light energy

4. Structure of a leaf

5. Starch Test a Leaf

6. Starch Test a Leaf