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Good pollution indicators are
Option: 1
Diatoms
Option: 2
Dinoflagellates
Option: 3
Euglenoids
Option: 4
Both diatoms and dinoflagellates
Answers (1)
-Diatoms are microscopic, eukaryotic and unicellular. They can be found in colonies too.
-Photosynthetic pigments like chlorophyll a, chlorophyll c and carotenoids are present.
-Since diatoms are able to photosynthesize, they convert dissolved carbon-di-oxide in the water into oxygen.
-These single-celled-algae are very sensitive to changes in water conditions, meaning they can act well as bioindicators of water quality and pollution levels.
Hence diatoms are good indicators of pollution.
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