IB Biology Topic C1.3.6 Similarities and Differences of Absorption and Action Spectra Revision Notes (SL/HL)

IB Biology Topic C1.3.6 Similarities and Differences of Absorption and Action Spectra Revision Notes (SL/HL) | RevisionDojo

Written by official IB examiners

Absorption and Action Spectra Broadly Match, and the Gaps Reveal How Accessory Pigments Help

An absorption spectrum shows how much light a photosynthetic pigment absorbs at each wavelength.
An action spectrum shows the rate of photosynthesis at each wavelength.
Comparing the two graphs tests whether the light a pigment absorbs is the light that actually drives photosynthesis.

Definition

Absorption spectrum

A graph showing the percentage of light absorbed at each wavelength by a pigment or group of pigments.

Definition

Action spectrum

A graph showing the rate of photosynthesis at each wavelength of light.

The Two Spectra Share the Same Overall Shape Because Absorbed Light Powers Photosynthesis

Both graphs plot activity against the wavelength of light across the visible range of 400 nm to 700 nm.
Both peak in the blue (around 450 nm) and red (around 680 nm) regions.
Both dip in the green region (around 500 to 550 nm), which is why leaves look green.
1. Chlorophyll reflects green light rather than absorbing it, so that light cannot drive photosynthesis.

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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.

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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Absorption and Action Spectra Broadly Match, and the Gaps Reveal How Accessory Pigments Help

An absorption spectrum shows how much light a photosynthetic pigment absorbs at each wavelength.
An action spectrum shows the rate of photosynthesis at each wavelength.
Comparing the two graphs tests whether the light a pigment absorbs is the light that actually drives photosynthesis.

Definition

Absorption spectrum

A graph showing the percentage of light absorbed at each wavelength by a pigment or group of pigments.

Definition

Action spectrum

A graph showing the rate of photosynthesis at each wavelength of light.

The Two Spectra Share the Same Overall Shape Because Absorbed Light Powers Photosynthesis

Both graphs plot activity against the wavelength of light across the visible range of 400 nm to 700 nm.
Both peak in the blue (around 450 nm) and red (around 680 nm) regions.
Both dip in the green region (around 500 to 550 nm), which is why leaves look green.
1. Chlorophyll reflects green light rather than absorbing it, so that light cannot drive photosynthesis.

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 C1.3.6: Similarities and Differences of Absorption and Action Spectra Notes

Absorption and Action Spectra Broadly Match, and the Gaps Reveal How Accessory Pigments Help

The Two Spectra Share the Same Overall Shape Because Absorbed Light Powers Photosynthesis

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

Absorption and Action Spectra Broadly Match, and the Gaps Reveal How Accessory Pigments Help

The Two Spectra Share the Same Overall Shape Because Absorbed Light Powers Photosynthesis

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