Question

Exoskeleton of coelenterates is _________.

• A. Siliceous
• B. Chitinous
• C. Calcareous
• D. Both B and C

Answer 1

Answer: (D)

Both B and C

Coelenterata are diploblastic, with two layers of cells, an outer layer called the ectoderm and the inner layer called endoderm. Polyps contain exoskeleton and endoskeleton. The skeletons are composed of calcium carbonate and chitin. Digestion is both intracellular and extracellular.

So, option D is the correct option.