4.2 Energy flow

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4.2 Energy flow

4.2 Energy flow

Concept mapping of the 4.2 Energy flow

Knowledge control of 4.2 Energy flow

Essential idea:

4.2.1  Ecosystems require a continuous supply of energy to fuel life processes and to replace energy lost as heat.

Nature of science:

4.2.2  Use theories to explain natural phenomena—the concept of energy flow explains the limited length of food chains. (2.2)

 

Understandings:

 

4.2.3  Most ecosystems rely on a supply of energy from sunlight.

 

Energy flow in the biosphere

 

4.2.4   Light energy is converted to chemical energy in carbon compounds by

photosynthesis.

 

4.2.5   Chemical energy in carbon compounds flows through food chains by means of feeding.

 

4.2.6   Energy released from carbon compounds by respiration is used in living

organisms and converted to heat.

 

4.2.7   Living organisms cannot convert heat to other forms of energy.

 

4.2.8  Heat is lost from ecosystems.

 

4.2.9  Energy losses between trophic levels restrict the length of food chains and

the biomass of higher trophic levels.

 

 Food chains/Tranfers and  Transformations

 

Skills:

 

4.2.10  Skill: Quantitative representations of energy flow using pyramids of energy.

 

Guidance:

 

 

4.2.11  Pyramids of number and biomass are not required. Students should be clear that biomass in terrestrial ecosystems diminishes with energy along food

chains due to loss of carbon dioxide, water and other waste products, such as

urea.

 

4.2.12  Pyramids of number and biomass are not required. Students should be clear that biomass in terrestrial ecosystems diminishes with energy along food

chains due to loss of carbon dioxide, water and other waste products, such as

urea.

 

International-mindedness:

 

4.2.13  The energetics of food chains is a factor in the efficiency of food production for the alleviation of world hunger.

 

Utilization:

 

4.2.14  Syllabus and cross-curricular links:

 

Biology

Topic 2.8 Cell respiration

Topic 2.9 Photosynthesis

 

Physics

Topic 2.3 Work, energy and power

Topic B.2 Thermodynamics

 

Environmental systems and societies

Topic 2.3 Flows of energy and matter

4.2 Energy flow Presentation

4.2 Energy flow Animations/Videos

4.2 Energy flow Past Paper Questions

4.2 Energy flow Articles

 




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