Which of the following is a filamentous alga?

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Multiple Choice

Which of the following is a filamentous alga?

Explanation:
Filamentous algae form long, threadlike chains of cells rather than single cells or flat sheets. Spirogyra grows as green filaments in freshwater, with each cell containing a distinctive spiral chloroplast, which is a hallmark of its threadlike structure. In contrast, Chlorella is unicellular, Ulva has a flat, sheet-like thallus, and Volvox is a hollow spherical colony of cells. So the thread-forming, filamentous habit makes Spirogyra the correct choice.

Filamentous algae form long, threadlike chains of cells rather than single cells or flat sheets. Spirogyra grows as green filaments in freshwater, with each cell containing a distinctive spiral chloroplast, which is a hallmark of its threadlike structure. In contrast, Chlorella is unicellular, Ulva has a flat, sheet-like thallus, and Volvox is a hollow spherical colony of cells. So the thread-forming, filamentous habit makes Spirogyra the correct choice.

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