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Pollution — Science STD 8 — Question

Maharashtra BoardEnglish MediumSTD 8SciencePollution1 Mark
Question
When water is mixed with natural or artificial unwanted material, the dissolved oxygen level of such water increases.
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Answer

False. (When water is mixed with natural or artificial unwanted material, the dissolved oxygen level of such water decreases. This causes harm to the resident animals. However when aquatic weeds and algae outgrow in number it causes rise in oxygen only during day time.)

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