Photosynthesis Energy Unveiled
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Photosynthesis Energy Unveiled
The process
Photosynthesis takes place in chloroplasts, which contain the green pigment chlorophyll. Chlorophyll absorbs light. Plants use this energy to convert carbon dioxide and water into glucose and oxygen. The glucose stores chemical energy that originated as light energy.
- Chemical energy in glucose is changed into light energy.
- Light energy is transferred into chemical energy stored in glucose.
- Heat energy is changed into sound energy.
- Electrical energy is stored in oxygen.
A greenhouse investigation
A class measured the rate of photosynthesis in pondweed at different light intensities. They kept the temperature and carbon dioxide concentration the same. The rate is shown as oxygen bubbles produced per minute.
Light intensity (arbitrary units)
Oxygen bubbles per minute
10
4
20
8
30
11
40
11
Energy through an ecosystem
Plants are producers: they make glucose using photosynthesis. Consumers obtain chemical energy by eating plants or other animals. Energy is transferred between organisms, while some is dissipated to the surroundings as heat.
3 printable pages
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