Which one of the following statement concerning the algae is incorrect ?
A. Most algae are photosynthetic.
B. Algae can be classified according to their pigments.
C. All algae are filamentous.
D. Spirogyra does not produce zoospores.
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Correct Answer : C.
Algae are defined as chlorophyllous, thalloid a vascular plants with no cellular differentiation. The size and form of algae is highly variable. Not all the algae are filamentious. The size ranges from the microscope unicellular forms to colonial forms and to the filamentous forms.