Biology

Question

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D. Oscillatoria

9. Even when killed by chlorine, the skeletons of these algae do not

They are a major problem for water treatment plants.

A. Diatoms

B. Closterium

C. Rivularia

D. Euglena

Answer

A. Diatoms.

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Diatoms are a type of algae that have a hard, silica-based skeleton called a frustule. Even when killed by chlorine, the frustules of diatoms do not break down easily, making them a major problem for water treatment plants. The accumulation of diatoms in water can cause taste and odor problems, clog filters, and interfere with disinfection processes.