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Photosynthesis &
Respiration
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1. What is Photosynthesis?
The process plants perform to make their own food
The food they make is a sugar called Glucose (C6H12O6)
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2. Where does Photosynthesis take place?• On plant leaves in a place called
chloroplasts
Elodea Plant
Zoom In
Elodea Plant cells
Zoom In
Inside of a chloroplast
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3. What do plants need for photosynthesis?
1. Carbon Dioxide CO2
2. Water H2O
3. Sunlight (light energy)
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4. What do plants make from photosynthesis?
• 1. Glucose (sugar, a.k.a. plant food)C6H12O6
• 2. Oxygen O2
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5. What is the equation for the chemical reaction of
photosynthesis?
Six molecules of carbon dioxide react with six molecules of water to form 1 molecule of glucose and six molecules of oxygen.
6CO2 + 6H2O → C6H12O6 + 6O2
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6. Describe Photosynthesis• The process of changing light energy
from the sun to chemical energy (food: glucose)
• Takes place in the chloroplasts, using chlorophyll, the green pigment in plants
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7. What happens during photosynthesis?
• Chlorophyll absorbs sunlight and uses the energy from light to change molecules of carbon dioxide and water into glucose
• Oxygen is also released
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8. Where does CO2 come from?
• Carbon dioxide enters the leaf through a hole on the bottom of the leaf called stomata
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Real stomate from a microscope
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9. Stomata▪ Stomate ( “sto-ma-tay” plural of
stomata) have guard cells that keep them open or closed
▪ When light is available stomata are open, and at night the stomate are closed.
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10. What is Glucose used for?
• Glucose is moved through tubes in the leaf to the roots, stems and fruits of the plants
• Some of the glucose is used right away by the plant for energy; some is stored as starch; and some is built into plant tissue.
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11. 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.
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Cellular Respiration
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1.What is Cellular Respiration?
• Once the light energy that was in the sun is changed into chemical energy by photosynthesis an organism has to transform the chemical energy into a form that can be used by the organism.
• This process is cellular respiration
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2.Describe Cellular Respiration
• The breakdown of glucose molecules to release energy
• Respiration takes place in all living things (plants & animals)
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3.Chemical equation for cellular respiration
C6H12O6 + 6O2
Glucose + Oxygen → Carbon Dioxide + Water + Energy
6CO2 + 6H20 + Energy (ATP)
Hmmm….. look familiar?????
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4. Cellular Respiration & Photosynthesis
•Cellular Respiration is the opposite process of Photosynthesis
PhotosynthesisReactants ProductsCarbon Dioxide Glucose
Water Oxygen
Sunlight
Cellular RespirationReactants Products
Glucose Carbon Dioxide
Oxygen Water
Energy (ATP)
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5. What is ATP?ATP stands for Adenosine Tri-phosphate• A molecule that provides energy for cellular process in all known organisms.
• Cellular process examples : Cell growth, DNA repair, inflammation, immunity, and fat metabolism (i.e.: burning fat)
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Check for Learning1. What is cellular respiration?
Answer: The breakdown of food to release energy
2. Who performs cellular respiration?Answer: Plants and Animals
3. How does Cellular respiration relate to photosynthesis?Answer: It is the reverse process of
photosynthesis