(A) $Nostoc$ is a genus of cyanobacteria that exists in the form of filaments. These filaments are known as trichomes,which are unbranched. The indivi

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(A) $Nostoc$ is a genus of cyanobacteria that exists in the form of filaments. These filaments are known as trichomes,which are unbranched. The individual cells within these trichomes are spherical or barrel-shaped and are arranged in a chain,giving the filament a bead-like appearance,which is described as moniliform.