1. Photosynthesis Photosynthesis is the process by which plants make their own food.

2. Why Study Photosynthesis? Photo means light Synthesis means put together. Photosynthesis is how plants make their own food

3. We all need photosynthesis! Directly or indirectly, all life on Earth depends on photosynthesis. –Plants take in carbon dioxide &release oxygen which controls our atmosphere –Animals and humans need oxygen to breathe –Plants create their own food (sugar) to grow. –Animals and humans eat the plants for food and energy –Plants provides energy - the energy stored in petroleum, natural gas, coal, and firewood all came from plants which have stored the energy from the sun via photosynthesis

4. Photosynthesis How green plants make their own food Plants Need –Light - from the sun –Water - from roots –Carbon dioxide – from air, enters plant through tiny openings under the leaves called stomata –Chlorophyll: green color in plants that traps energy from sunlight to make food

5. Photosynthesis A chemical reaction makes glucose (sugar) and oxygen from the carbon dioxide and water The plant keeps the glucose (sugar) as the main source of nutrition or food for the plant; helps plant grow. The plant releases the oxygen into the atmosphere.