Home » Which of the algae is responsible for red colour of red sea Algae MCQs Which of the algae is responsible for red colour of red sea December 30, 2021 7 Views Q. Which of the algae is responsible for red colour of red sea Chlamydomonas brauiiTrichodesmium erythriumUlothrix zonataNone of the above Answer: Trichodesmium erythrium