IB Biology Topic C1.3.5 Absorption of Specific Wavelengths of Light by Photosynthetic Pigments Revision Notes (SL/HL)

IB Biology Topic C1.3.5 Absorption of Specific Wavelengths of Light by Photosynthetic Pigments Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Chlorophyll Absorbs Mainly Red and Blue Light and Reflects Green

Definition

Photosynthetic pigments

Photosynthetic pigments are specialized molecules that absorb light energy and convert it into chemical energy during photosynthesis.

The main photosynthetic pigments are chlorophyll a, chlorophyll b, and carotenoids.
Each pigment absorbs light at its own specific wavelengths, which is the light energy that drives photosynthesis.
The wavelengths a pigment does not absorb are reflected, and this reflected light is the colour we see.

Tip

Chlorophyll appears green because it reflects green light rather than absorbing it.

Pigments Absorb Only Wavelengths That Match Their Electrons

Light is made of photons, each with a particular wavelength and energy.
Shorter wavelengths such as blue light carry more energy, while longer wavelengths such as red light carry less.
A pigment can only absorb a photon whose energy matches the energy levels of its electrons.
This is why each pigment absorbs only certain wavelengths and not others.

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Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Duis aute irure dolor in reprehenderit

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Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit.

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

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Chlorophyll Absorbs Mainly Red and Blue Light and Reflects Green

Definition

Photosynthetic pigments

Photosynthetic pigments are specialized molecules that absorb light energy and convert it into chemical energy during photosynthesis.

The main photosynthetic pigments are chlorophyll a, chlorophyll b, and carotenoids.
Each pigment absorbs light at its own specific wavelengths, which is the light energy that drives photosynthesis.
The wavelengths a pigment does not absorb are reflected, and this reflected light is the colour we see.

Tip

Chlorophyll appears green because it reflects green light rather than absorbing it.

Pigments Absorb Only Wavelengths That Match Their Electrons

Light is made of photons, each with a particular wavelength and energy.
Shorter wavelengths such as blue light carry more energy, while longer wavelengths such as red light carry less.
A pigment can only absorb a photon whose energy matches the energy levels of its electrons.
This is why each pigment absorbs only certain wavelengths and not others.

Definition

Paywall

(on a website) an arrangement whereby access is restricted to users who have paid to subscribe to the site.

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Note

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam quis nostrud exercitation.

Excepteur sint occaecat cupidatat non proident

Tip

Lorem ipsum dolor sit amet, consectetur adipiscing elit.
Sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
Duis aute irure dolor in reprehenderit in voluptate velit esse cillum.

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

IB Biology Topic C1.3.5: Absorption of Specific Wavelengths of Light by Photosynthetic Pigments Notes

Chlorophyll Absorbs Mainly Red and Blue Light and Reflects Green

Pigments Absorb Only Wavelengths That Match Their Electrons

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

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Chlorophyll Absorbs Mainly Red and Blue Light and Reflects Green

Pigments Absorb Only Wavelengths That Match Their Electrons

anim nostrud sit dolore minim proident quis fugiat velit et eiusmod nulla quis nulla mollit dolor sunt culpa aliqua

Duis aute irure dolor in reprehenderit

Excepteur sint occaecat cupidatat non proident

Unlock the rest of this chapter with a free account

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics