Question

Which of the following matching pairs is wrong?

• A. Mollusca - pseudocoel
• B. Cnidaria - nematocyst
• C. Annelida - chloragogen cells
• D. Echidermata - water vascular system

Answer 1

The correct option is A Mollusca - pseudocoel

a) Phylum Mollusca are coelomates. It has open circulatory system. In this, the main body cavity is a hemocoel through which blood circulates.

b) Nematocyst is a spherical capsule produced by members of the phylum Cnidaria. It is used to capture prey.

c) Chloragogen cells are cells present in coelomic fluid of Annelida. It has similarl function as that of liver in vertebrates.

d) The water vascular system is a hydraulic system present in echidermata, such as sea stars and sea urchins. It is used for locomotion, food and waste transportation, and respiration.

Thus, the correct answer is option A.