Multiple choice

Sponges do not have any organ. They are characterised by cellular grade of organisation. Their skeleton is usually secreted by

  1. the Pinacocytes

  2. the Mesenchyme

  3. the Archaeocytes

  4. the Sclerocytes

  5. the Porocytes

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

The secretion of spicules is carried out by sclerocytes. Other cells, called spongocytes, secrete the spongin skeletat fibres when those are present.