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How do different colored lights affect photosynthesis?

By: Nicole Rossi and Emily Wang

Emily Wang

on 15 October 2013

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Transcript of How do different colored lights affect photosynthesis?

How do different
lights affect photosynthesis?

• The colors humans can see depends on the reflection or absorption of visible light by pigments. When certain wavelengths are reflected, color is produced.
• In chloroplasts, the main pigment present is chlorophyll a.
• There are other pigments present in chloroplasts known as accessory pigments, such as chlorophyll b and carotenoids.
• These different pigments absorb different wavelengths due to structural differences.

Light is a form of energy.
Photons are particles of light energy that travel in a wave-like motion.
Different forms of light have different wavelengths.
Electromagnetic Spectrum
The electromagnetic spectrum depicts the different forms of light, as well as the wavelengths of these forms.
The part of the spectrum that humans can see is known as visible light.
Visible light participates in photosynthesis.
Pigment absorption
Absorption spectrum
1) Pigment absorbs light
2) An electron becomes excited
3) The electron rapidly returns to ground state

What Is Happening?
• In the light reactions of photosynthesis, photosystems embedded in the thylakoid membrane contain pigments that absorb photons.
Connection to Photosynthesis
1) Pigments absorb photons and transfer the energy to special chlorophyll molecules within the reaction center of a photosystem
2) An electron of the chlorophyll molecules becomes excited and a primary electron acceptor receives the electron
3) The electron travels down the electron transport chain

Rate of Photosynthesis Under Different Wavelengths
The rate of photosynthesis is affected by the different wavelengths of light a plant is exposed to because different pigments in chloroplasts absorb different wavelengths for use in photosynthesis.
Nicole Rossi and Emily Wang
AP Biology 3* & 7*
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