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Introduction to Photosynthesis. AP Biology Mrs. Hansell. Ways to Acquire Energy. Autotroph - self-feeders- make own food Plants, some bacteria Photoautotroph- organisms that use light as a source of energy to make food Heterotroph - unable to make own food, consume others Animals.

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introduction to photosynthesis

Introduction to Photosynthesis

AP Biology

Mrs. Hansell

ways to acquire energy
Ways to Acquire Energy
  • Autotroph- self-feeders- make own food
    • Plants, some bacteria
    • Photoautotroph- organisms that use light as a source of energy to make food
  • Heterotroph- unable to make own food, consume others
    • Animals
the nature of sunlight
The Nature of Sunlight
  • Form of energy known as electromagnetic energy
    • Travels in waves
  • Wavelength- distance between crests in the waves
  • Electromagneticspectrum- entire range of radiation
visible light
Visible Light
  • Segment most important to life – detected as various colors by the human eye
  • Photons- energy particles that make up light
    • Shorter the wavelength- more energy in photon
    • Violet light has more energy than red light
photosynthetic pigments
Photosynthetic Pigments
  • Light meets matter- reflected, transmitted, absorbed
  • Pigment- absorb visible light
    • Colors we see are wavelengths that are reflected
    • Plants appear green- reflect green light absorbs violet-blue and red
  • Spectrophotometer- instrument that measures the ability of a pigment to absorb various wavelengths of light
photosynthetic pigments1
Photosynthetic Pigments
  • AbsorptionSpectrum- a graph plotting a pigments light absorption versus wavelength
absorption spectra of chloroplast
Absorption Spectra of Chloroplast
  • Chlorophylla absorbs violet-blue and red light—best for photosynthesis
    • Blue-Green is reflected—less effective
  • Actionspectrum- profiles the effectiveness of different wavelengths
accessory pigments
Accessory Pigments
  • Broaden spectrum of colors absorbed
  • Chlorophyllb- reflects yellow-green
  • Carotenoids- hydrocarbons various shades of yellow and orange (absorb violet and blue-green light)
    • Photoprotection- dissipate excessive light energy that could damage chlorophyll or interact with O2
excitation of chlorophyll
Excitation of Chlorophyll
  • What happens when chlorophyll and other pigments absorb light?
  • Molecule absorbs photon of light—electron in molecule excited to orbital with more potential energy
  • Groundstate- electron in normal orbital
  • Excitedstate- absorb photon—gain energy
excitation of chlorophyll1
Excitation of Chlorophyll
  • Ground state to excited state does not last long
  • Excess energy released as heat when electron goes from excited back to ground state
  • Makes top of automobiles hot on sunny day—white cars cooler—reflect all visible light
  • Some pigments emit light and heat as electron falls to ground state--Fluoresce