Unformatted text preview: generations. 3. Nutrition—algae are photoautotrophs and are found in the photic (light) zone in bodies of water. Chlorophyll and sometimes other pigments are responsible for the colors of algae and their ability to carry out photosynthesis. Algae are classified according to their rRNA, structures, pigments, and other qualities. ROLES OF ALGAE IN NATURE 1. Algae are important in the food chain. 2. In carrying out oxygenic photosynthesis, it is estimated that algae produce up to 80% of earth’s oxygen. 3. Much of the world’s petroleum was formed from diatoms and other plankton. 4. Many unicellular algae live in symbiosis with animals. 5. Algal blooms occur and are responsible for red tides and the associated toxins. When the large amounts of algae die, their decomposition depletes the water of oxygen....
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- Fall '09
- 80%, Algae Algae, stemlike stipes, asexually. Multicellular algae, Life Cycle—all algae