Photosynthesis Plants Leaf Structure Stomata Plant Adaptations - - PowerPoint PPT Presentation

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Photosynthesis Plants Leaf Structure Stomata Plant Adaptations - - PowerPoint PPT Presentation

Jun 18, 2023 219 likes •560 views

Photosynthesis Plants Leaf Structure Stomata Plant Adaptations for Photosynthesis Desert Plant Adaptations Solar Energy Solar energy travels to Earth in different wavelengths of light Pigments A pigment is a protein molecule that

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Photosynthesis

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SLIDE 2

Plants

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SLIDE 3

Leaf Structure

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Stomata

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Plant Adaptations for Photosynthesis

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Desert Plant Adaptations

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Solar Energy

  • Solar energy travels to Earth in different

wavelengths of light

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Pigments

  • A pigment is a protein molecule that absorbs

light

  • The primary pigments in green plants are

chlorophyll a and chlorophyll b

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SLIDE 9

Chlorophyll Pigments

  • Chlorophyll pigments absorb blue-violet and

red regions of the visible spectrum best

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SLIDE 10
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Other Plant Pigments

  • Cooler temperatures cause plants to produce

less chlorophyll, revealing “hidden” pigments

  • Carotenes – red and orange
  • Xanthophylls – yellow
  • Anthocyanins – purple, red, blue (pH dependent)
  • Fucoxanthins - brown
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Purpose of Photosynthesis

  • To convert solar energy into a form of energy

that is useable to all organisms

  • Solar energy is stored in the chemical bonds of

glucose (chemical energy)

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Photosynthesis Reaction

“putting together with light”

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Photosynthetic Organisms

  • Green plants
  • Algae
  • Cyanobacteria
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SLIDE 15

Simple Story of Photosynthesis and Food

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Reactants and Products for Photosynthesis

  • Identify the reactants:
  • Identify the products:
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Photosynthetic Organelle

  • Photosynthetic reactions occur within the

chloroplast

  • Contains the green pigment chlorophyll
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Summary of Photosynthesis

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Photosynthesis Summary

  • The reactions of photosynthesis use solar

energy to convert carbon dioxide and water into high energy sugars (glucose) and oxygen gas

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Photosynthesis Reaction

  • 1. Light absorption by chlorophyll molecules
  • 2. Light dependent reactions
  • 3. Calvin Cycle
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Chloroplast

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Light Absorption by the Chlorophyll Molecules

  • Clusters of chlorophyll pigments called

photosystems absorb light energy

  • Light energy “excites” or energizes the

electrons of the chlorophyll pigments

  • Shorter wavelengths of light have more energy

and are therefore more effective at “exciting” electrons

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Photosystems are embedded within the thylakoid membranes of chloroplasts

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Light Dependent Reactions

  • Occur within the thylakoid membranes of the

chloroplasts

  • “energy building” reactions
  • Require light in order to occur
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Light Dependent Reactions

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Light Dependent Reactions Summary

  • Light energy splits water molecules into hydrogen

ions (H+) and oxygen gas (photolysis)

  • Two high energy compounds, ATP and NADPH, are

also produced

  • ATP and NADPH transfer energy (“excited” electrons)

to the Calvin cycle

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SLIDE 27

Light Dependent Reactions

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Light Dependent Reactions Products

  • Oxygen gas –

released into the atmosphere (waste product)

  • ATP and NADPH –

to the Calvin cycle

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Calvin Cycle

  • Occur in the stroma of the chloroplasts
  • “sugar building” reactions
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Calvin Cycle

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Calvin Cycle

  • Inorganic carbon (from CO2) is incorporated

into organic carbon (carbon fixation)

  • CO2 combines with a five-carbon sugar called

RuBP (forms an intermediate 6-carbon compound)

  • Energy stored in ATP and NADPH is used to

convert the temporary 6-C intermediate compound into carbohydrates

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