Triploblastic Animals & Mesoderm — NEET Biology
📚 Practice ConceptThose animals in which the developing embryo has a third germinal layer, mesoderm, in between the ectoderm and endoderm, are called triploblastic animals (platyhelminthes to chordates,).
Observe the following diagrams (a–d) showing different germ layer arrangements. Which of the following represents the arrangement found in Planaria?
View solution & NCERT explanation
Correct answer: B — Diagram (b)
Planaria (Platyhelminthes) is triploblastic, possessing ectoderm, mesoderm, and endoderm. Diagram (b) correctly shows all three germ layers. Diagram (a) is mislabelled (does not show endoderm properly). Diagram (c) shows mesoglea, a feature of diploblastic animals like Aurelia (Cnidaria). Diagram (d) incorrectly adds a fictitious “superderm.” Thus, the correct answer is Diagram (b).
What does NCERT say about Those animals which developing?
Has this concept appeared in NEET?
Which chapter is this from?
Through deep analysis of NEET and NTA, 176 of the 180 ReNEET 2026 (June 21) questions were already in the MedicNEET question bank before the exam.
176/180MedicNEET's Biology question bank is built from the same NCERT lines NTA picks repeatedly. Not random MCQs — questions crafted exactly like NTA crafts them.