The mainspring of life is photosynthesis, the process by which plants manufacture food out of carbon dioxide-and water under the influence of sunlight. So one of the problems of biology is to learn as much as possible about photosynthesis. If the process could be made more efficient, the world's food supply would take a large jump. Since photosynthesis depends on the energy of sunlight, it stops when a plant is in darkness. In fact it runs backward. A plant respires (breathes) like an animal, absorbing oxygen and giving off carbon dioxide, and biologists have assumed that the plant...
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