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B
Spirogyra
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C
Selaginella
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D
Chlorella
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Solution
The correct option is BSpirogyra
Spirogyra is called as pond scum, because the filaments float on the surface of large masses.
It is also called as pond silk because it continuously secretes mucilage by dissolution of pectin of the outer layer of the cell wall, which is shiny and slimy silk.