Carbon dioxide and water supply atoms for the overall photosynthesis process, while absorbed light supports the reactions. Sugars contain carbon that can become part of new plant tissue. Plants also carry out respiration, including when they are photosynthesising. This model isolates the input-output relationship rather than showing every chemical step, enzyme or environmental limit on growth.
Plants, animals and ecosystems · Discover & try
Where does a plant get the material for growth?
Reading level 3 of 5 · IndependentChange
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photosynthesis
Using light energy to help form sugars from inorganic inputs.
carbon dioxide
An atmospheric gas that supplies carbon for photosynthesis.
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See how it works
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Schematic input-output model, not a complete chemical pathway or crop-growth prediction.
What to look for
- Light supplies energy
- Carbon dioxide supplies carbon
- Water and minerals have different roles
Explain what you noticed
A sapling gains carbon while growing in a pot. Which source supplies most of that carbon?
Keep this idea: Separate the source of energy from the sources of plant matter.
Follow the sources
- U.S. Department of Energy — DOE Explains the Plant Microbiome
- U.S. Department of Energy — DOE Explains the Carbon Cycle
Source material checked 2026-10-28. Explanations and activities by Nepedia. Source links do not imply endorsement.
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