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  1. 'Pond silk' is the common name of
    1. Spongilla
    2. Chlorella
    3. Selaginella
    4. Spirogyra
Correct Option: D

Spirogyra is a freshwater alga found freely floating on the surface of the stagnant pools, ponds and ditches, etc. It is commonly known as water silk or pond silk.



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