BIOL 1406 Lecture 10: Biology notes Ch. 10

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8 Feb 2017
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Photosynthesis is the process that converts solar energy into chemical energy. Directly or indirectly, photosynthesis nourishes almost the entire living world. The energy that maintains almost all life on earth comes from the sun. Autotrophs sustain themselves without eating anything derived from other organisms. Autotrophs are the producers of the biosphere, producing organic molecules from co2 and other inorganic molecules. Almost all plants are photoautotrophs, using the energy of sunlight to make organic molecules from h2o and co2. The electromagnetic spectrum is the entire range of electromagnetic energy, or radiation. Visible light consists of wavelengths (including those that drive photosynthesis) that produce colors we can see. Not all wavelengths of light can power photosynthesis. Accessory pigments, such as chlorophyll b, broaden the spectrum used for photosynthesis. Accessory pigments called carotenoids absorb excessive light that would damage chlorophyll. Concept 10. 1: photosynthesis converts light energy to the chemical energy of food.

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