Nematoda tissue organization is described as which combination?

Nematoda tissue organization is described as which combination?

• A. Triploblasts, eumetazoa
• B. Diploblastic, eumetazoa
• C. Triploblastic, diploblastic
• D. Pseudocoelomates

Answer: (A)

The question is about how many germ layers and whether true tissues are present. Nematodes develop from ectoderm, mesoderm, and endoderm, giving them three germ layers, so they are triploblastic. They also have differentiated tissues and organs, which places them in eumetazoa (true multicellular animals with tissues). They are not diploblastic (which would mean only two germ layers) and while they are pseudocoelomates, that describes a body cavity rather than tissue organization. So the best description is triploblastic, eumetazoa.

The question is about how many germ layers and whether true tissues are present. Nematodes develop from ectoderm, mesoderm, and endoderm, giving them three germ layers, so they are triploblastic. They also have differentiated tissues and organs, which places them in eumetazoa (true multicellular animals with tissues). They are not diploblastic (which would mean only two germ layers) and while they are pseudocoelomates, that describes a body cavity rather than tissue organization. So the best description is triploblastic, eumetazoa.