Multiple choice Which of the following algae are rich sources of iodine? Laminaria Fucus Polysiphonia Chara 1 and 2 1 and 3 1 and 4 2 and 3 3 and 4 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Iodine is commercially obtained from brown algae Laminaria, Macrocystis, Fucus.