AIPMT PRELIMS2005Zoology-Platyhelminthes
AIPMT PRELIMS 2005 Zoology Body Symmetry MCQ Question
Type: MCQ-conceptual-Easy-Class 11
In contrast to annelids the platyhelminths show:
A
radial symmetry
B
presence of pseudocoel
C
bilateral symmetry
D
Abscence of Body Cavity
Correct Answer
Option D
Detailed Explanation
🧠Explanation
Correct Answer: (D) Absence of body cavity
- Platyhelminthes → Acoelomate → body cavity is absent.
- Annelida → Coelomate → true coelom is present.
- Both are bilaterally symmetrical, so “bilateral symmetry” is not a distinguishing feature.
- Pseudocoelom is also absent in Platyhelminthes.
⚡ Quick Revision: Platyhelminthes = Triploblastic + Bilateral + Acoelomate Annelida = Triploblastic + Bilateral + True coelomate
✅ Answer: D — Absence of body cavity
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