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Sticky Note
Spirogyra are commonly known as “Pond Silk” because its:
  1. B Filament are slippery to touch.
  2. Filament are made up of silk
  3. Filament makes the pond slippery.
  4. None of these
Explanation

Spirogyra is called pond silk because it is very slimy and hence slippery to the touch.

It is a freshwater green algae

They are found in shallow ponds, ditches, and lakes.

They are free-floating.


Additional informational:

Spirogyra's two-layered cell walls are composed of pectin on the outside and cellulose on the inside.

The body of the spirogyra has a shiny and silky texture due to the mucilage

that is produced when this pectin dissolves in water. Pond silk gets its name from this.

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