Question

Ascaris$/$Nemathelminthes possesses body cavity called:

• A. Coelom
• B. Pseudocoelom
• C. Haemocoel
• D. Coelenteron

Answer 1

Answer: (B)

Pseudocoelom

Pseudocoelom is the characteristic body cavity of roundworms (Ascaris/Nemathelminthes). It is filled with protein-rich pseudocoelomic fluid and carries five giant mesenchyme cells, known as pseudocoelomocytes that occupy fixed positions in the anterior third of the body. Pseudocoelomic fluid is composed of about 93% water and substances such as protein, glucose, non-protein nitrogenous substances, sodium chloride, and phosphate.

So, the correct answer is 'Psedocoelom'.