1.

State whether the following statement are True or False. Explain your statement:When water is mixed with natural or artificial unwanted material, the dissolved oxygen level of such water increases.

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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