respiration photosynthesis and cellular · factors affecting cellular respiration •temperature...
TRANSCRIPT
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Photosynthesis and Cellular Respiration
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Energy
• All living things need energy.
• Energy comes in many forms such as light, heat, electricity, nourishment, etc.
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Photosynthesis
• Plants get their energy from the sun
• Purpose of photosynthesis:1. Convert light energy into chemical energy in the form of glucose (sugar).
• 2. Energy is stored in glucose.
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Photosynthesis
Reactants Products
Carbon Dioxide Sugar
Water Oxygen
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Photosynthesis happens in chloroplasts!
Autotrophs
Leaves
Cells
Chloroplasts
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Chlorophyll
• Chloroplasts contain chlorophyll
• Chlorophyll- green pigment that absorbs most light but reflects green light.
AbsorbedReflected
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Factors affecting Photosynthesis• Availability of Reactants
-Must have light and CO2 to complete
• Amount of CO2 -As CO2 increases, the rate of photosynthesis increases
• Intensity of Light -The more intense the light, the faster the photosynthesis can occur
• Color of Light• Temperature• pH
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Cellular Respiration
• Heterotrophs get energy from glucose stored in food
• Purpose of Cellular Respiration:1. Make ATP2. Release chemical energy from glucose and convert it into ATP
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ATP= Usable Energy
• ATP -> Adenosine Triphosphate
-Energy is released when bonds are broken
-This energy can be used for cell processes
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Cellular Respiration
-Occurs in the mitochondria
-Plant and Animal Cells
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Cellular RespirationReactants Products
Glucose Carbon Dioxide
Oxygen Water
ATP
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Two Types of Cellular Respiration
Aerobic Respiration
• With Oxygen
• Produces 36 ATP molecules
Anaerobic Respiration
• Without Oxygen
• Produces 2 ATP molecules
• Anaerobic respiration is also called fermentation. This occurs in the absence of oxygen.
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Factors Affecting Cellular Respiration
• Temperature• pH
• ATP is necessary for life, so cells have a Plan B when none is available. -When there is no glucose the cell will break down fats and proteins
-When there is no oxygen the cell goes through fermentation