A) basal cell
B) middle cells
C) rhizoidal
D) all green cells
Correct Answer: D
Solution :
Spirogyra is a filamentous, unbranched green algae. It consists of cylindrical green cells arranged one above the other. The length of Spirogyra filament increases as a result of transvers divisions in all the green cells. Colourless portion only helps in the attachment of the filament to the substratum.
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