Multiple choice Which of the following algae are rich sources of iodine? Laminaria Fucus Polysiphonia Chara Only 1 and 2 Only 1 and 3 Only 1 and 4 Only 2 and 3 Only 3 and 4 Reveal answer Fill a bubble to check yourself B Correct answer Explanation Laminaria is a rich source of iodine. Polysiphonia is a rich source of bromine.