What is the tissue organization of Platyhelminthes?

What is the tissue organization of Platyhelminthes?

• A. Triploblasts, Eumetazoa
• B. Diploblasts, Eumetazoa
• C. Triploblasts, Parazoans
• D. Diploblasts, Parazoans

Answer: (A)

Platyhelminthes are triploblastic, meaning they develop from three germ layers—ectoderm, mesoderm, and endoderm. This allows the formation of true tissues and organs, including muscles and organ systems, which is a hallmark of eumetazoans. They belong to Eumetazoa, the group of animals that have such true tissues, as opposed to Parazoans like sponges that lack organized tissues. Diploblasts, in contrast, have only two germ layers (ectoderm and endoderm) and do not have mesoderm, so they don’t fit the tissue organization seen in flatworms.

Platyhelminthes are triploblastic, meaning they develop from three germ layers—ectoderm, mesoderm, and endoderm. This allows the formation of true tissues and organs, including muscles and organ systems, which is a hallmark of eumetazoans. They belong to Eumetazoa, the group of animals that have such true tissues, as opposed to Parazoans like sponges that lack organized tissues. Diploblasts, in contrast, have only two germ layers (ectoderm and endoderm) and do not have mesoderm, so they don’t fit the tissue organization seen in flatworms.