Question

Classification of Porifera is based on

• A. branching
• B. spicules
• C. reproduction
• D. symmetry.

Answer 1

The Correct Option is B

 The classification of the phylum Porifera is primarily based on the type of spicules present within their structure. Porifera, commonly known as sponges, are simple, multicellular organisms found in marine and freshwater environments. The spicules serve as a structural component and help in the identification and classification of these organisms.

1. Understanding Spicules: Spicules are minute, pointed structures found within the tissue of sponges. They are made up of silica or calcium carbonate, depending on the class of Porifera. These structures help provide support and deter predators.
2. Classification Based on Spicules:
   • Class Calcarea: These sponges have spicules made of calcium carbonate.
   • Class Hexactinellida: Also known as glass sponges, they possess spicules made of silica, which often have six rays.
   • Class Demospongiae: These sponges have spicules made of spongin or silica, and sometimes combine both materials. They are the most diverse class.
3. Eliminating Other Options:
   • Branching: While some sponges may exhibit branching forms, it is not a primary factor for classification in Porifera.
   • Reproduction: Sponges can reproduce both sexually and asexually, but reproduction methods are not key classification criteria.
   • Symmetry: Most sponges are asymmetrical; symmetry is not utilized for their classification.

Based on the explanation above, the correct answer to the question "Classification of Porifera is based on" is spicules.