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When is ATP needed?

When is ATP needed?. During Cellular Respiration – an energy releasing process Photosynthesis – an energy storing process. Photosynthesis: Transforming Light Energy to Chemical Energy. Photosynthesis- Autotrophs trap energy from sunlight and use the energy to make glucose

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When is ATP needed?

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  1. When is ATP needed? During • Cellular Respiration – an energy releasing process • Photosynthesis – an energy storing process

  2. Photosynthesis: Transforming Light Energy to Chemical Energy • Photosynthesis- • Autotrophs trap energy from sunlight and use the energy to make glucose • The process in which plants use energy from sunlight to convert water and carbon dioxide into glucose and oxygen

  3. Photosynthesis • Photosynthesis takes place in the organelle – Chloroplast • Chloroplast contain the green pigment Chlorophyll • Chlorophyll captures light energy • The site of Photosynthesis is the Mesophyll of the Leaves

  4. Light Spectrum • When you see a green plant, the pigments in the plant are Absorbing all the light spectrum and Reflecting only green light. • Our eyes see the color that is reflected. • A black shirt absorbs all light and reflects none • A white shirt reflects all light and absorbs none. • What color is reflected by a red shirt? • What colors are absorbed by the red shirt?

  5. Photosynthesis • Requires: • Water • Carbon Dioxide • Chlorophyll- a green pigment that captures sunlight • Sunlight • Produces: • Glucose • Oxygen-the main provider of oxygen in the atmosphere

  6. Equation for Photosynthesis Yields Carbon Dioxide + Water Sugar + Oxygen In the presence of: Sunlight and Chlorophyll Transforming light energy into chemical energy

  7. Inside a Chloroplast • Photosynthesis takes place inside Chloroplasts of Leaves • Chloroplast contain: • Thylakoids - are the saclike membranes. • A granum is a stack of thylakoid membranes. • The Stroma is the space outside the thylakoid or granum. • Photosystems are the groups of pigments and proteins in the thylakoids that absorb light energy

  8. 6CO2 +6H2O -> C6H12O6 + 6O2

  9. The Reactions of Photosynthesis • Photosynthesis take place in 2 parts: • Light reactions • In the thylakoid membranes • Absorb light and water • Makes ATP and NADPH • Releases Oxygen • Calvin Cycle • In the stroma • Use ATP, NADPH and CO2 • Make glucose

  10. Light Reactions Chlorophyll Absorbs Light Occurs in the thylakoid membranes 1. Light striking chlorophyll causes electrons to gain energy and leave orbit. 2. Electrons move down Electron Transport Chain, generating extra energy. 3. ATP is produced

  11. Light Reactions Breaks Water • Photolysis –a water molecule is split • H bonds with NADP to form NADPH • Oxygen is released into the atmosphere

  12. Calvin Cycle Calvin Cycle Occurs in the Stroma 1. Carbon Dioxide is split 2.Carbon, Oxygen & Hydrogen(light reaction) are used make glucose 3. The energy is provided by the ATP (light reaction). This process takes: -CO2 from the air-H from water -Energy from ATP-To make food. 6CO2 +6 H2O -> C6H12O6 + 6O2

  13. Compare Photosynthesis & Respiration • Opposite Processes • Respiration- C6H12O6 +O2----->CO2 +H2O + ENERGY • Photosynthesis - CO2 + H2O+ Sunlight ---> C6H12O6 + O2

  14. Tropism Tropism - Plants respond to their environment • Gravitropism – respond to gravity • + toward gravity • - away from gravity • Phototropism- respond to light • Positive toward light • Neg. away from light • Thigmotropism – respond to touch • Close in response to touch • Wrap around in response to touch • IVY

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