Question

Harmful and useful protozoa

Answer 1

Useful :Protozoa play an important role in mineralizing nutrients, making them available for use by plants and other soil organisms.

Harmful:protozoans cause diseases in humans like ,Plasmodium causes malaria.

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Answer 2

Harmful and useful protozoa are plasmodium and volvox respectively.

• Protozoa are single called eukaryotic organisms.
• They can live in freshwater, marine water and even in the soil.
• Examples are amoeba, plasmodium, paramecium, euglena and Trypanosoma.
• They cause many diseases such as amoebiasis, malaria and Giardia.
• Protozoan movement is facilitated by cilia and flagella.
• Plasmodium causes malaria while Volvox is used in genetic research by scientists.