what do u mean by phaeophytization? plz giv a detailed info

what is phaeophytization

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Its destruction of lichen due to SO2 pollution 
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The damge or harm caused to lichen due to so2
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So2 reacts with mg of chlorophyll and forms mgso4 and phyton tail.
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Phaeophytization is a reliable bio-indicator of the total environmental stress. This process causes the formation of a compound called phaeophytin which is one of the breakdown products of chlorophyll. It remains pigmented but is not active in photosynthesis. Thus, the process of phaeophytization reduces the photosynthetic capability of plants.
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