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Photosynthesis Part 2

Photosynthesis Part 2. Pages 112 to 113. Solar Energy to Chemical Energy – Vocab Review. Electromagnetic energy Solar energy or radiation which travels in space a rhythmic waves and can be measured in photons Wavelength

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Photosynthesis Part 2

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  1. Photosynthesis Part 2 Pages 112 to 113

  2. Solar Energy to Chemical Energy – Vocab Review • Electromagnetic energy • Solar energy or radiation which travels in space a rhythmic waves and can be measured in photons • Wavelength • The distance between crests of adjacent waves such as those of the electromagnetic spectrum • Visible Light • The radiation our eyes see as different colors

  3. Fig. 10-6 1 m (109 nm) 10–3 nm 10–5 nm 103 nm 1 nm 106 nm 103m Micro- waves Radio waves Gamma rays X-rays UV Infrared Visible light 750 nm 500 600 700 550 650 380 450 Longer wavelength Shorter wavelength Higher energy Lower energy

  4. Vocab continued… • Pigments • Substances that absorb some wavelengths of light and reflect others • Different pigments absorb/reflect different wavelengths • Photon • A fixed quantity of light energy • The shorter the wavelength of light the greater the energy of a photon

  5. Fig. 10-7 Light Reflected light Chloroplast Absorbed light Granum Transmitted light

  6. Chlorophyll – primary pigment of photosynthesis • Which wavelengths are absorbed most? • Primarily blue and red • Why do plants appear green? • They reflect green light • What is the role of accessory pigments? • They allow the plant to absorb energy from more the visible light spectrum – making the plant more efficient.

  7. Fig. 10-9 RESULTS Chloro- phyll a Chlorophyll b Absorption of light by chloroplast pigments Carotenoids 400 500 600 700 (a) Absorption spectra Wavelength of light (nm) Rate of photosynthesis (measured by O2 release) (b) Action spectrum Aerobic bacteria Filament of alga (c) Engelmann’s experiment 400 600 500 700

  8. Excitation of chlorophyll by light • When a pigment absorbs light, it goes from a ground state to an excited state, which is unstable • When excited electrons fall back to the ground state, photons are given off, an afterglow called fluorescence • If illuminated, an isolated solution of chlorophyll will fluoresce, giving off light and heat

  9. Photosystems capture solar power • Photosystem (1st part) • Light harvesting complexes • pigment molecules bounded by proteins; absorb • transfer energy to chlorophyll a of reaction center

  10. Photosystems capture solar power • Photosystem (2nd part) • Reaction Center • Chlorophyll a and a primary electron acceptor • Chlorophyll a uses energy from light harvesting complexes to pass a pair of electrons to the primary electron acceptor

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