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4.2: Energy Flow
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State how energy in carbon compounds enters most biological communities.
Understanding: Most ecosystems rely on a supply of energy from sunlight.
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In most ecosystems, chemical potential energy stored in carbon compounds enters biological communities through
photosynthesis in producers.
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This set contains the content understandings, applications, skills and nature of science syllabus statements for IB Biology topic 4.2: Energy Flow.
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State how energy in carbon compounds enters most biological communities.
Understanding: Most ecosystems rely on a supply of energy from sunlight.
In most ecosystems, chemical potential energy stored in carbon compounds enters biological communities through
photosynthesis in producers.
List three groups of autotrophs.
Understanding: Most ecosystems rely on a supply of energy from sunlight.
Autotrophs are organisms that produces complex organic compounds from inorganic substances, generally using energy from light or inorganic chemical reactions.
Common autotrophs are:
-plants
-algae
-cyanobacteria
Outline how light energy is converted to chemical energy.
Understanding: Light energy is converted to chemical energy in carbon compounds by photosynthesis.
Light energy is converted to chemical energy through
photosynthesis.
Producers absorb wavelengths of light using photosynthetic pigments and convert this light energy into chemical energy.
Define "food chain."
Understanding: Chemical energy in carbon compounds flows through food chains by means of feeding.
A food chain is a
sequence of organisms through which nutrients and energy pass as one organism eats another.
Food chains show which organisms eats which organism. Food chains always begin with a producer and follow the flow of energy through trophic levels.
Define "food web."
Understanding: Chemical energy in carbon compounds flows through food chains by means of feeding.
A food web represents
the interconnected feeding relationships within an ecological community.