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Photosynthesis and Respiration

Learn about the intricate processes of photosynthesis and respiration in plants, from the movement of materials to the importance of these vital functions. Understand how plants intake raw materials and produce energy.

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Photosynthesis and Respiration

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  1. Photosynthesis and Respiration Chapter 5 Section 1 p.128- 135

  2. A. Taking in Raw Materials • How plants eat and breathe

  3. 1. Movement of materials • A. Most water enters through the roots of a plant

  4. A. Most water enters through the roots of a plant B. Water vapor exits through the leaves. 1. Movement of materials

  5. A. Most water enters through the roots of a plant B. Water vapor exits through the leaves. C. Carbon dioxide and oxygen enter and exit through the leaves 1. Movement of materials

  6. 2. Leaf structure and function Layers of cells

  7. 2. Leaf structure and function Layers of cells • A. Epidermis- Outer layer containing many stomata to control water loss

  8. 2. Leaf structure and function Layers of cells • A. Epidermis- Outer layer containing many stomata to control water loss • B. Spongy layer- Contains carbon dioxide and water (vapor) needed for food production

  9. 2. Leaf structure and function Layers of cells • A. Epidermis- Outer layer containing many stomata to control water loss • B. Spongy layer- Contains carbon dioxide and water (vapor) needed for food production • C. Food is produced in the palisade layer

  10. 3. Chloroplasts and pigments

  11. 3. Chloroplasts and pigments • A. Chloroplasts- cell structures in which photosynthesis occurs

  12. 3. Chloroplasts and pigments • A. Chloroplasts- cell structures in which photosynthesis occurs • B. Chlorophyll is the green pigment in chloroplasts

  13. 3. Chloroplasts and pigments • A. Chloroplasts- cell structured in which photosynthesis occurs • B. Chlorophyll is the green pigment in chloroplasts • C. Pigments help plants absorb light energy to make food

  14. B. Food-Making Process • 1. Photosynthesis- plant uses carbon dioxide, water, and light energy in the presence of chlorophyll to make glucose and oxygen. • In two parts: -Light dependent reactions -Light independent reactions

  15. Photosynthesis • 2. Light dependent reactions (can only take place in the presence of sunlight) • - light energy splits water into oxygen and hydrogen; hydrogen kept for later reactions, oxygen is released as a waste product

  16. Photosynthesis • 3. Light independent reactions (can take place in the absence of sunlight) a. Carbon dioxide and hydrogen from light- dependent reactions combine to make glucose.

  17. Photosynthesis • 3. Light independent reactions (can take place in the absence of sunlight) • a. Carbon dioxide and hydrogen from light- dependent reactions combine to make glucose. • b. Glucose is used in a plant’s structure and growth

  18. Photosynthesis • 3. Light independent reactions (can take place in the absence of sunlight) • a. Carbon dioxide and hydrogen from light dependent reactions combine to make glucose. • b. Glucose is used in a plant’s structure and growth • c. Extra glucose is stored as other sugars or carbohydrates

  19. Photosynthesis • 4. Importance of photosynthesis • a. Directly or indirectly produces food for almost all organisms

  20. Photosynthesis • 4. Importance of photosynthesis • a. Directly or indirectly produces food for almost all organisms. • b. Removes carbon dioxide and adds oxygen to the atmosphere

  21. C. Breakdown of food • Respiration releases energy =

  22. Respiration • 1. Chemical reactions that break down food molecules and release energy

  23. Respiration • 1. Chemical reactions that break down food molecules and release energy • a. Glucose is broken down into smaller molecules in a cell’s cytoplasm. + +

  24. Respiration • 1. Chemical reactions that break down food molecules and release energy • a. Glucose is broken down into smaller molecules in a cell’s cytoplasm. • b. Aerobic respiration uses oxygen to break down smaller molecules and occurs in cell’s mitochondria.

  25. Respiration • 2. Respiration is important because it provides cells with useable energy.

  26. Respiration • 2. Respiration is important because it provides cells with useable energy. • a. Energy helps to transport and produce materials • b. Waste product of respiration is carbon dioxide which is returned to the atmosphere

  27. Respiration • 2. Respiration is important because it provides cells with useable energy. • a. Energy helps to transport and produce materials

  28. D. Comparisons • Photosynthesis and respiration are reverse processes CO2and H2O Respiration Photosynthesis C6H12O6and O2

  29. D. Comparisons • Photosynthesis and respiration are reverse processes • 1. Photosynthesis, occurring only in cells with chlorophyll, combines carbon dioxide and water using light energy and releases glucose and oxygen.

  30. D. Comparisons • Photosynthesis and respiration are reverse processes • 1. Photosynthesis, occurring only in cells with chlorophyll, combines carbon dioxide and water using light energy and releases glucose and oxygen. • 2. Aerobic respiration occurs in the mitochondria of all cells and combines oxygen and food to release energy, carbon dioxide, and water.

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