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Option 4 : Spirogyra

  • Spirogyras are filamentous algae that consist of thin unbranched chains of cylindrical cells while the other three are differentiated into roots, stems, and leaves.
  • Spirogyras can form masses that float near the surface of streams and ponds.
  • Spirogyra is also known as water silk and pond silk.
  • Algae Spirogyra was the first living cell observed under a microscope by Anton van Leeuwenhoek.
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