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Warm-up: Sept 25, 2013 • Write down the following questions: 1. What is the equation for photosynthesis? 2. What organelle carries out photosynthesis? 3. What type of organisms carry out photosynthesis? Photosynthesis 1. What is it? Photosynthesis is the turning of Carbon dioxide and Water into Glucose and oxygen, with the use of energy from the sun. 2. Why do we need photosynthesis? • The only source of energy is the SUN. • Humans (and ALL living things) need energy to survive. • We cannot harness and use the energy from the sun directly; plants must convert it into FOOD energy for us through photosynthesis. 3. Where does photosynthesis occur? Plants do it. In the organelle called the chloroplasts with a pigment called chlorophyll. Chlorophyll This pigment absorbs energy from the sunlight and uses it for the energy needed to make the photosynthesis reaction go. 4. What is the formula for the reaction of Photosynthesis? Carbon Dioxide + Water + Sunlight → Sugar (Glucose) + Oxygen Gas (Waste Product) What happens to the sugar? The sugar is then transported through tubes in the leaf to the roots, stems, and fruits of the plant. 1. Some of the sugar is used immediately by the plant for energy. 2. Some is stored as starch 3.Some is built into a more complex substance like plant tissue or cellulose ***Fortunately for us, plants often produce more food than they need, which they store 1. Stems: example Celery and Asparagus 2. Roots- Radishes, Carrots, Potatoes 3. Seeds: sunflower seeds and beans 4. Fruit