Polluted water bodies usually have a very high abundance of plants like $Nostoc$ and $Oscillatoria$. Give reasons.

(N/A) $\rightarrow$ Some cyanobacteria or blue-green algae like $Nostoc$ and $Oscillatoria$ can tolerate adverse conditions,including pollutants,much better than other aquatic plants.
This is due to the presence of a protective mucilage covering,resistant proteins,and the absence of sap vacuoles.
They release a large quantity of spores that are always present in the air.
These organisms obtain plenty of nutrients in polluted water,which promotes their rapid growth.
Hence,they often bloom in such conditions and are found in abundance in polluted water.