Discussion 5.docx - Define a lichen in traditional terms for example as it is presented in your textbook In your answer be sure define what is meant by

Discussion 5.docx - Define a lichen in traditional terms...

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Define a lichen in traditional terms, for example, as it is presented in your textbook. In your answer, be sure define what is meant by a "symbiosis". Describe the different growth forms of lichens (there are 3 growth forms) and common places they can be found. What is the new discovery about lichens reported on in this news article and how does this change the traditional view of lichens? According to Biology in Focus Volume 2, lichen is defined as a symbiotic association between a photosynthetic microorganism such as alga or bacteria and a fungus while symbiosis means that two organisms from different kinds have the close relationship and bring benefits to each other. In lichen, photosynthesizing alga or bacteria will produce food by photosynthesis and fungus plays roles in protecting and gathering nutrients and moisture. Therefore, as the first sentences of the article, the author Steph Yin mentions the mnemonic method to memory the definition of lichen in high school is “Fred took a likin’ to Alison” (Yin). In three growth forms of lichen,
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Unformatted text preview: foliose lichens have flat, leafy structures like lettuce, while crustose lichens are crusts-like structure, and fruticose are resemble miniature upright shrubs or hang down in festoons from branches. Lichens are commonly found on soil, rock or tree bark. However, recently, biologists have found the third contribution of another fungus called basidiomycete yeast through researching the variation between two species of lichens consisting of the same fungus and alga. Thereafter, they realized the amount of basidiomycete yeast’s genes is higher in the yellow lichen having vulpinic acid. In addition, the basidiomycete yeast has the function in variating the species which means structure than the environment. This new discovery changes the traditional view of lichens that basidiomycete yeast will be an effective assistant of fungus to make a lichen with alga....
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