Multiple choice Which of the following statements is incorrect? Chlamydomonas is a unicellular alga. Volvox form cuboidal colonies up to 50,000 cells in number. Ulothrix and spirogyra are filamentous algae. Asexual reproduction in algae is carried out by the production of zoospores. Chlamydomonas is an anisogamous alga. Reveal answer Fill a bubble to check yourself B Correct answer Explanation Volvox form spherical colonies up to 50,000 cells in number. The colonies live in fresh water habitat.