Photosynthesis Cellular Respiration An Introduction What is Photosynthesis
- Slides: 15
Photosynthesis & Cellular Respiration An Introduction
What is Photosynthesis? • The process of photosynthesis is a chemical reaction. • It is the most important chemical reaction on our planet.
What is the equation for the chemical reaction of photosynthesis? 6 CO 2 6 H 2 O C 6 H 12 O 6 6 O 2 Six molecules of carbon dioxide react with six molecules of water to form 1 molecule of glucose and six molecules of oxygen.
What is the equation for the chemical reaction of photosynthesis? Light Energy Carbon Dioxide Water Glucose Oxygen
Describe Photosynthesis • The process of changing light energy to chemical energy • Energy stored as sugar • Occurs in plants and some algae • Plants need light energy, CO 2, and H 2 O • Takes place in the chloroplasts, using chlorophyll, the green pigment in plants
What Happens During Photosynthesis? • Plants capture light energy and use that energy to make glucose • Sunlight provides the energy needed by chlorophyll to change molecules of carbon dioxide and water into glucose • Oxygen is also released in this reaction
What Happens During Photosynthesis? • Carbon dioxide enters the leaf through holes called stomata • CO 2 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
Why is This Important to Us? • We cannot make our own food (glucose, energy), we must get our food from plants. • Plants are the first step in the food chain. • The oxygen released during photosynthesis is necessary for all living things.
What is Cellular Respiration? • The release of chemical energy for use by cells. • Once the energy that was in sunlight is changed into chemical energy by photosynthesis, an organism has to transform the chemical energy into a a form that can be used by the organism. • This process is cellular respiration.
Describe Cellular Respiration • The breakdown of glucose molecules to release energy • Takes place in all living things • Is a step by step process: – Glycolysis – Krebs Cycle – Electron Transport Cycle
What is the Equation for Cellular Respiration? C 6 H 12 O 6 Glucose 6 O 2 Oxygen 6 CO 2 6 H 2 O Carbon Dioxide Water
The product of one process is the reactant of the other.
Learn more about photosynthesis and cellular respiration at: http: //www. ftexploring. com/me/photosyn 1. html http: //www. usoe. k 12. ut. us/curr/science/sciber 00/8 th/energy/sciber/photosyn. htm
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