Question

As a group, acoelomates are characterized by:

• A. a body cavity called a haemocoel
• B. deuterostome development
• C. a coelom that is not completely lined with mesoderm
• D. a solid body without a cavity surrounding internal organs

Answer 1

Answer: (D)

a solid body without a cavity surrounding internal organs

Acoelomates do not possess a body cavity or coelom i.e the fluid-filled cavity between the digestive tract and the body wall that also surrounds the other internal organs is absent.

So, the correct option is 'a solid body without a cavity surrounding internal organs'.