(A) The cells of $Spirogyra$ are longer than their breadth. The cell wall is two-layered. The inner wall is made up of cellulose and the outer of pect

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(A) The cells of $Spirogyra$ are longer than their breadth. The cell wall is two-layered. The inner wall is made up of cellulose and the outer of pectose. When pectose comes in contact with water,it makes the filament slimy or slippery. Hence,this alga is commonly called pond silk.