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Energy & Living Systems
Agricultural Biology
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Almost all energy in living systems comes from the sun
Plants, algae, and certain bacteria absorb sunlight Photosynthesis: The process of converting light energy (from the sun) to chemical energy (sugar)
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Autotrophs vs. Heterotrophs
Organisms that use energy from sunlight Most are photosynthetic Heterotrophs: Organisms that get their energy from food (rather than directly from sunlight) Humans and other animals Get energy from cellular respiration
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Discussion With the person sitting next to you, come up with 3 examples of autotrophs and 3 examples of heterotrophs. Following this, discuss why you think it is important that heterotrophs and autotrophs exist together in environments.
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Cellular Respiration A metabolic process similar to burning fuel
This process releases much of the energy in food to make ATP ATP: the main energy source of cells
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How do we get energy from eating food?
1) Food is eaten. 2) Digestion begins. 3) Chemical energy is released gradually by enzyme-assisted reactions. 4) Some energy is released as heat. 5) The remaining energy is stored in ATP molecules. 6) ATP delivers energy within the cell (to power chemical reactions).
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Energy Flow in an Ecosystem
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