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Q & A: plants and light

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Most recent answer: 10/22/2007
Q:
Why do Plants need light??
- Rachel and Steph
Tamworth, NSW, Australia
A:
It takes some form of energy to convert available ingredients, such as carbon dioxide and water, to building blocks of plants, such as sugars. Green plants (and many bacteria) use the energy of sunlight to drive that process. The process is called photosynthesis.
Almost all the other organisms (the other bacteria, animals, and fungi) end up using the same building blocks, either by eating plants or photosynthetic bacteria or by eating somebody who ate them. So, except for a few organisms that live off weird undersea chemical energy sources, we all live off sunlight directly or indirectly.

Mike W.

(published on 10/22/2007)

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