Multiple choice

The means of respiration in the echinodermata is/are _________.

  1. gills

  2. papulae

  3. tuft-like gills

  4. tracheal gill

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

Respiration in the echinodermata (starfish and sea urchins) is carried out using a very primitive version of gills called papulae. These thin protuberances on the surface of the body contain diverticula of the water vascular system.