A) Spirogyra
B) Uhtiirix
C) Nostoc
D) Annbaena
Correct Answer: A
Solution :
The cells of Spirogyra are longer than their breadth. The cell wall is two layered. The inner wall is made up of cellulose and outer of pectose. When pectose comes in contact with water it gives the filament slimy or slippery. Hence, the alga is called pond silk.
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