Question

Classification of Porifera is based up on

• A. Spicules
• B. Canal system
• C. Amoebocytes
• D. Nutrition

Answer 1

The correct option is A Spicules

Poriferans are diploblastic and have two germ layers- ectoderm and endoderm. The internal skeleton is made up of spongin fibres and spicules. Spicules are the structural elements found in most sponges. Sponges are classified on the basis of different types of spicules -they are Calcarea where the spicules are made up of calcium carbonate, Hexactinellida where the spicules are made up of silica, Demospongia where the spicules are composed of siliceous spicules or spongin fibres or both.

So, the correct answer is option A.