Spirogyra is commonly called pond silk because

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Silk is manufactured from it

It looks like a thread

It is slimy to touch

All of the above

answer is C.

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Detailed Solution

Concept: Pond silk is the common name of Spirogyra (algae) because it is very slimy.
Spirogyra is a genus (about 400 species) of freshwater green algae which are found in shallow ponds, ditches and amongst vegetation at the edges of large lakes, generally growing free-floating.
Hence, option 3 is correct.

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