Multiple choice

Which of the following algae is a source of iodine?

  1. Polysiphonia

  2. Nostoc

  3. Laminaria

  4. Volvox

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Laminaria (a brown alga/kelp) is a rich commercial source of iodine. Kelp has been historically harvested for iodine extraction. Polysiphonia is a red alga, Nostoc is a blue-green alga, and Volvox is a green colonial alga - none are major iodine sources.