IB Biology Topic C1.3.8 Carbon Dioxide Enrichment Experiments Revision Notes (SL/HL)

IB Biology Topic C1.3.8 Carbon Dioxide Enrichment Experiments Revision Notes (SL/HL) | RevisionDojo

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Carbon Dioxide Enrichment Experiments Test How Plants Respond to a Higher-CO2 Future

Carbon dioxide is often the limiting factor for photosynthesis, so raising it can speed the process up.
Because atmospheric carbon dioxide is rising, scientists want to predict how plants and ecosystems will respond.
Enrichment experiments raise carbon dioxide above today's level and measure the effect on photosynthesis and growth.

Tip

Elevated carbon dioxide boosts photosynthesis most when light and temperature are not themselves limiting.

Two Designs Are Used, and Each Trades Realism Against Control

Enclosed greenhouse experiments
1. Plants grow in a sealed space where carbon dioxide and other conditions are tightly controlled.
Free-Air Carbon Dioxide Enrichment (FACE) experiments
1. Plants grow outdoors in real ecosystems while extra carbon dioxide is released around them.

Enclosed Greenhouse Experiments Give Tight Control But an Artificial Setting

Carbon dioxide is pumped in to raise it above the atmospheric level, for example from 400 ppm to 700 ppm.
Light intensity, temperature, humidity, water, and nutrients are all held constant.
Scientists then measure photosynthesis rate, biomass, leaf area, and crop yield.

Strengths and Limitations of Greenhouse Experiments

Controlled variables
1. Light, temperature, and humidity can be set precisely.
Replicability
1. The same conditions can be repeated for reliable results.
Artificial environment
1. Conditions may not reflect a real ecosystem.
Cost
1. Holding carbon dioxide and other conditions steady is expensive.

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Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris.
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Carbon Dioxide Enrichment Experiments Test How Plants Respond to a Higher-CO2 Future

Carbon dioxide is often the limiting factor for photosynthesis, so raising it can speed the process up.
Because atmospheric carbon dioxide is rising, scientists want to predict how plants and ecosystems will respond.
Enrichment experiments raise carbon dioxide above today's level and measure the effect on photosynthesis and growth.

Tip

Elevated carbon dioxide boosts photosynthesis most when light and temperature are not themselves limiting.

Two Designs Are Used, and Each Trades Realism Against Control

Enclosed greenhouse experiments
1. Plants grow in a sealed space where carbon dioxide and other conditions are tightly controlled.
Free-Air Carbon Dioxide Enrichment (FACE) experiments
1. Plants grow outdoors in real ecosystems while extra carbon dioxide is released around them.

Enclosed Greenhouse Experiments Give Tight Control But an Artificial Setting

Carbon dioxide is pumped in to raise it above the atmospheric level, for example from 400 ppm to 700 ppm.
Light intensity, temperature, humidity, water, and nutrients are all held constant.
Scientists then measure photosynthesis rate, biomass, leaf area, and crop yield.

Strengths and Limitations of Greenhouse Experiments

Controlled variables
1. Light, temperature, and humidity can be set precisely.
Replicability
1. The same conditions can be repeated for reliable results.
Artificial environment
1. Conditions may not reflect a real ecosystem.
Cost
1. Holding carbon dioxide and other conditions steady is expensive.

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 C1.3.8: Carbon Dioxide Enrichment Experiments Notes

A - Unity and Diversity9 subtopics

B - Form and Function10 subtopics

C - Interaction and Interdependence9 subtopics

D - Continuity and Change12 subtopics

Carbon Dioxide Enrichment Experiments Test How Plants Respond to a Higher-CO2 Future

Two Designs Are Used, and Each Trades Realism Against Control

Enclosed Greenhouse Experiments Give Tight Control But an Artificial Setting

Strengths and Limitations of Greenhouse Experiments

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

Carbon Dioxide Enrichment Experiments Test How Plants Respond to a Higher-CO2 Future

Two Designs Are Used, and Each Trades Realism Against Control

Enclosed Greenhouse Experiments Give Tight Control But an Artificial Setting

Strengths and Limitations of Greenhouse Experiments

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