BIO 1305 Lecture Notes - Lecture 13: Leaf, Chloroplast, Heterotroph

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3 Dec 2017
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Plants and other photosynthetic organisms contain organelles called chloroplasts. Photosynthesis is the process that converts solar energy into chemical energy within chloroplasts. Directly or indirectly, photosynthesis nourishes almost the entire living world. Autotrophs are (cid:862)self-feeders(cid:863) that sustai(cid:374) the(cid:373)sel(cid:448)es (cid:449)ithout eati(cid:374)g a(cid:374)ythi(cid:374)g deri(cid:448)ed fro(cid:373) 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. Some eat other living organisms; others, called decomposers, consume dead organic material or feces. Almost all heterotrophs, including humans, depend on photoautotrophs for food and o2. Earth"s supply of fossil fuels (cid:449)as for(cid:373)ed fro(cid:373) the re(cid:373)ai(cid:374)s of orga(cid:374)is(cid:373)s that died hundreds of millions of years ago. Fossil fuels are being consumed faster then they are being replenished. Researchers are exploring methods of using the photosynthetic process to produce fossil fuels. Concept 10. 1: photosynthesis converts light energy to the chemical energy of food.

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