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Photosynthesis

I. What is Photosynthesis? The process of changing light energy (in the chloroplasts) to chemical energy (food for plants) The Sun is the main source of energy

II. Stages Photosynthesis occurs in two stages: Stage 1: (light dependent stage) the phase that occurs in the light – a pigment in the chloroplast called chlorophyll captures sunlight energy Stage 2: (Light independent stage) carbon dioxide and water and used to make glucose and oxygen Side note:oxygen and carbon dioxide move through the stomata under the leaf

III. What is the equation for the chemical reaction of photosynthesis? Carbon dioxide + water + light energy  Glucose + Oxygen B. 6CO2 + 6H2O + L.E.  C6H12O6 + 6O2

IV. Photosynthesis Facts Occurs in plants, algae, and some protists Plants need light energy, CO2, and H2O Oxygen is also released in this reaction Energy stored as sugar called GLUCOSE Takes place in the chloroplasts, using chlorophyll, the green pigment in plants

V. Importance of Photosynthesis Autotrophs: make their own food Example: plants Side Note: Plants are the first level of the food chain (producers) Heterotrophs: get their food by eating other organisms Example: Humans

Importance of Photosynthesis C. The oxygen released during photosynthesis is necessary for all living things.

VI. What happens during photosynthesis? Carbon dioxide enters the leaf through holes called stomata CO2 combines with the stored energy in the chloroplasts through a chemical reaction to make glucose The sugar is moved through tubes in the leaf to the roots, stems and fruits of the plants Some of the sugar is used right away by the plant for energy; some is stored as starch; and some is built into plant tissue

To be completed: Read the photosynthesis paper. Answer the two questions on back of reading. Complete the pink half sheet using the reading. Monocot/Dicot Worksheet (purple) Circle whether the plant is an example of a monocot or dicot. Give one reason for how you know. Use pages 51-53 in your notebook to help you.

Monocot/Dicot Worksheet Circle whether the plant is an example of a monocot or dicot. Give one reason for how you know. Use pages 51-53 in your notebook to help you.