Multiple choice Which of the following algae contain increased amount of Iodine and Potash? Blue-green algae Red algae Brown algae called Kelp Green algae Diatom Reveal answer Fill a bubble to check yourself C Correct answer Explanation Brown algae called Kelp are the nautical multicellular algae rich in Iodine and Potash. It plays major role in aquatic ecosystem both as food and the habitat they create.