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Question

Spirogyra is called pond silk because
  1. Filaments are slippery to touch
  2. None of these
  3. Filaments are made up of silk
  4. Both (a) and (b)


Solution

The correct option is A Filaments are slippery to touch
The plant body of Spirogyra is an unbranched filamentous thallus, measuring about 1 m in length. The Spirogyra filament is very slimy due to the presence of mucilage sheath that lines the whole filament. The mucilage often holds the filaments together in a matted blanket. Hence, Spirogyra is commonly known as pond silk, water silk, pond scum or mermaid’s trees because of their bright green silky appearance. 

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