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Chapter Introduction Lesson 1 Energy Processing in Plants Lesson 2 Plant Responses Chapter Wrap-Up. Chapter Menu. What processes enable plants to survive?. Chapter Introduction. What do you think?.

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  1. Chapter Introduction Lesson 1 Energy Processing in Plants Lesson 2 Plant Responses Chapter Wrap-Up Chapter Menu

  2. What processes enable plants to survive? Chapter Introduction

  3. What do you think? Before you begin, decide if you agree or disagree with each of these statements. As you view this presentation, see if you change your mind about any of the statements. Chapter Introduction

  4. 1. Plants do not carry on cellular respiration. 2. Plants are the only organisms that carry on photosynthesis. 3. Plants make food in their underground roots. Do you agree or disagree? Chapter Introduction

  5. 4. Plants do not produce hormones. 5. Plants can respond to their environments. 6. All plants flower when nights are 10–12 hours long. Do you agree or disagree? Chapter Introduction

  6. Energy Processing in Plants • How do materials move inside plants? • How do plants perform photosynthesis? • What is cellular respiration? • How are photosynthesis and cellular respiration alike, and how are they different? Lesson 1 Reading Guide - KC

  7. Energy Processing in Plants • photosynthesis • cellular respiration Lesson 1 Reading Guide - Vocab

  8. Materials for Plant Processes • Xylem and phloem—the vascular tissue in most plants—transport materials throughout a plant. • Water flows inside xylem to all parts of a plant. • Most plants make their own food; a liquid sugar that moves out of food-making cells, enters phloem, and flows to all plant cells. Lesson 1-1

  9. Materials for Plant Processes(cont.) Carbon dioxide, oxygen, and water vapor pass into and out of a plant through tiny openings in leaves. How do materials move through plants? Lesson 1-1

  10. Photosynthesis Photosynthesis is a series of chemical reactions that convert light energy, water, and carbon dioxide into the food-energy molecule glucose and give off oxygen. photosynthesis from Greek photo–, means “light”; and synthesis, means “composition” Lesson 1-2

  11. Photosynthesis(cont.) • In the first step of photosynthesis, plants capture the energy in light with their leaves. • This occurs in chloroplasts found in mesophyll cells, which contain plant pigments. • Chlorophyll, the most common plant pigment, is necessary for photosynthesis. Lesson 1-2

  12. Photosynthesis(cont.) • In the second step of photosynthesis, sugars are made . • In chloroplasts, carbon dioxide and water are broken down. Then, using energy stored in chlorophyll, the atoms combine to form sugar molecules. Lesson 1-2

  13. Lesson 1-2

  14. Photosynthesis(cont.) What are the two steps of photosynthesis? Lesson 1-2

  15. Cellular Respiration • Cellular respiration is a series of chemical reactions that convert the energy in food molecules into a usable form of energy called ATP. • Glucose molecules break down during cellular respiration. • Plants can produce sugar, but without cellular respiration, plants could not grow, reproduce, or repair tissues. Lesson 1-3

  16. Cellular Respiration(cont.) What is cellular respiration? Lesson 1-3

  17. Cellular Respiration(cont.) • Most plants, some protists, and some bacteria carry on photosynthesis. • Most organisms (living things) carry on cellular respiration. • All life on Earth depends on a balance of these two processes. Lesson 1-3

  18. Lesson 1-3

  19. Page 383 in book Lesson 1-4

  20. Cellular Respiration(cont.) How are photosynthesis and cellular respiration alike, and how are they different? Lesson 1-4

  21. Materials that a plant requires to survive move through the plant in the vascular tissue, xylem and phloem. • Plants can make their own food by using light energy, water, and carbon dioxide. Lesson 1 - VS

  22. The products of photosynthesis are the reactants for cellular respiration. Lesson 1 - VS

  23. Which term refers to the organelles where photosynthesis occurs? A. palisade mesophyll cells B. chlorophyll C. chloroplasts D. spongy mesophyll cells Lesson 1 – LR1

  24. Which process breaks down glucose molecules? A. cellular respiration B. light energy capture C. first step of photosynthesis D. second step of photosynthesis Lesson 1 – LR2

  25. Which have open spaces between them that gases flow through? A. spongy mesophyll cells B. palisade mesophyll cells C. chloroplasts D. chlorophyll Lesson 1 – LR3

  26. 1. Plants do not carry on cellular respiration. 2. Plants are the only organisms that carry on photosynthesis. 3. Plants make food in their underground roots. Do you agree or disagree? Lesson 1 - Now

  27. Plant Responses • How do plants respond to environmental stimuli? • How do plants respond to chemical stimuli? Lesson 2 Reading Guide - KC

  28. Plant Responses • stimulus • tropism • photoperiodism • plant hormone Lesson 2 Reading Guide - Vocab

  29. Stimuli and Plant Responses • Stimuli are any changes in an organism’s environment that cause a response. • Light, touch and gravity are examples of stimuli plants may respond to. Lesson 2-1

  30. Environmental Stimuli • A tropism is a response that results in plant growth toward or away from a stimulus. • When the growth is toward a stimulus, the tropism is called positive. • Growth away from a stimulus is considered negative. Lesson 2-2

  31. The growth of a plant toward or away from light is a tropism called phototropism Lesson 2-2

  32. Environmental Stimuli(cont.) tropism from Greek tropos, means “turn” or “turning” Lesson 2-2

  33. Environmental Stimuli(cont.) • The response of a plant to touch is called a thigmotropism. • Special structures that respond to touch, called tendrils, can wrap around or cling to objects. Lesson 2-2

  34. Environmental Stimuli(cont.) • The response of a plant to gravity is called gravitropism. • Stems grow away from gravity, while roots grow toward gravity. Lesson 2-2

  35. Environmental Stimuli(cont.) What types of environmental stimuli do plants respond to? Give three examples. Lesson 2-2

  36. Environmental Stimuli(cont.) • Photoperiodism is a plant’s response to the number of hours of darkness in its environment. • Plants that flower when exposed to less than 10-12 hours of darkness are called long-day plants. Lesson 2-2

  37. Environmental Stimuli(cont.) • Short-day plants require 12 or more hours of darkness for flowering to begin. • Day-neutral plants flower when they reach maturity and the environmental conditions are right. Lesson 2-2

  38. The number of hours of darkness controls flowering in many plants. Lesson 2-2

  39. Chemical Stimuli • Plant hormones are substances that act as chemical messengers within plants. • Auxins are hormones responsible for phototropism. • They cause the cells on the dark side of the plant’s stem to grow longer. Lesson 2-3

  40. Chemical Stimuli(cont.) • The plant hormone ethylene helps stimulate the ripening of fruit. • Ethylene is a gas that can be produced by fruits, seeds, flowers, and leaves. How do plants respond to the chemical stimuli, or hormones, auxin and ethylene? Lesson 2-3

  41. Humans and Plant Responses • Humans make plants more productive by using plant hormones. (GMO) • Some crops are now easier to grow because humans understand how plants respond to hormones. Lesson 2-4

  42. Plants respond to stimuli in their environments in many ways. Lesson 2 - VS

  43. Photoperiodism occurs in long-day plants and short-day plants. Day- neutral plants are not affected by the number of hours of darkness. Lesson 2 - VS

  44. Plant hormones are internal chemical stimuli that produce different responses in plants. Lesson 2 - VS

  45. Which term refers to the growth of a plant toward or away from light? A. phototropism B. photoperiodism C. gravitropism D. thigmotropism Lesson 2 – LR1

  46. Which of the following helps stimulate the ripening of fruit? A. auxins B. cytokinins C. ethylene D. tendrils Lesson 2 – LR2

  47. Which refers to special plant structures that respond to touch? A. roots B. stems C. leaves D. tendrils Lesson 2 – LR3

  48. 4. Plants do not produce hormones. 5. Plants can respond to their environments. 6. All plants flower when nights are 10–12 hours long. Do you agree or disagree? Lesson 2 - Now

  49. Key Concept Summary Interactive Concept Map Chapter Review Standardized Test Practice Chapter Review Menu

  50. Plants survive by maintaining homeostasis and responding to stimuli. In addition, they acquire the energy they need for life processes through photosynthesis and cellular respiration. The BIG Idea

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