Multiple choice

Red Sea is red due to the presence of

  1. sea weeds

  2. algae

  3. fungi

  4. lichens

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

The Red Sea appears reddish due to periodic blooms of Trichodesmium erythraeum, a cyanobacteria (blue-green algae) that contains reddish-brown pigments. While sometimes called 'sea weeds,' the correct scientific classification is algae or cyanobacteria.