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B
Ectocarpus
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C
Spirogyra
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D
Volvax
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Solution
The correct option is B Ectocarpus
B. Ectocarpus
Solution: Thallus differentiated into a prostrate portion and an upright or projecting system is called heterotrichous thallus. Heterotrichous thallus is found in green algae like Draparnaldia, Fritschiella and in some brown algae scu as Ectocarpus.