Question

All animals having true coelom are characterised by the following, except.

• A. Presence of mesoderm
• B. Presence of tube-within-tube body plan
• C. Presence of true segmentation
• D. Presence of usually bilateral symmetry

Answer 1

The correct option is B Presence of tube-within-tube body plan

A true coelom is formed within the mesoderm layer; thus, the true coelom is entirely lined with mesoderm. Both the gut and the body wall have mesodermal components. It shows a tube-like digestive tract within the tube body plan.

So, the correct option is ‘Presence of tube-within-tube body plan’.