Question

Diploblastic and triploblastic are terms that describe

• A. the number of invaginations during embryonic development
• B. the number of heads during embryonic development
• C. the number of germinal layers during embryonic development
• D. the number of cell types during development

Answer 1

Answer: (C)

Diploblastic animals have two germinal layers (ectoderm and endoderm) during embryonic development, e.g., poriferans. Triploblastic animals have three germinal layers (ectoderm, mesoderm and endoderm) during embryonic development, e.g., platyhelminthes.