photosynthetic pigments

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9 Terms

1
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role of photosynthetic pigments

they absorb different wavelengths of light for photosynthesis

2
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types of pigments [explain their type]

chlorophyll a [primary pigment]

chlorophyll b [accessory pigment]

carotenoids  [accessory pigment]

3
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chlorophyll a absorbs red and blue light. It reflects green light, causing leaf to appear green

4
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location of photosynthetic pigments in a chloroplast.

-they are found in photosystems→ in the thylakoid membrane

[they are arranged in clusters called photosystems]

5
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each photosystem contains:

-a reaction centre

-a light-harvesting system

6
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what is a light harvesting system and its role

-contains accessory pigments that surround the reaction centre (chlorophyll a)

role

-the pigment molecules absorb light energy and transfer it to the reaction centre→ reaction centre uses this energy to excite electrons

[watch freesciencelessons]

<p>-contains accessory pigments that surround the reaction centre (chlorophyll a)</p><p><strong>role</strong></p><p>-the pigment molecules absorb light energy and transfer it to the reaction centre→ reaction centre uses this energy to excite electrons</p><p>[watch freesciencelessons]</p>
7
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<p>How is light harvested in the chloroplast membrane (5)</p>

How is light harvested in the chloroplast membrane (5)

-pigments are in photosystem/ light-harvesting system

-pigment molecules absorb light energy

-accessory pigments absorb different wavelengths of light

-the energy is transferred from one pigment to another to the reaction centre

-the energy is used to excite electrons

<p>-pigments are in photosystem/ light-harvesting system</p><p>-pigment molecules absorb light energy</p><p>-accessory pigments absorb&nbsp;different wavelengths of light</p><p>-the energy is transferred from one pigment to another to the reaction centre</p><p>-the energy is used to excite electrons</p>
8
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2 types of photosystems and what wavelength do they each absorb light best at

Photosystem I (PSI)

-absorbs light best at a wavelength of 700nm

Photosystem II (PSII)

-absorbs light best at a wavelength of 680nm

9
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advantage of the range of accessory pigments

-allows a range of wavelengths to be absorbed so more light energy can be absorbed

[without it, some wavelengths of light would not be absorbed. Therefore less light energy can be absorbed for photosynthesis]