Assertion : Open circulatory system is found in most arthropods.
Reason : Arthropods contain haemolymph which directly bathers internal tissues and organ.

Options

A. Both A and R are correct and R is the correct explanation of A
B. Both A and R are correct , but R is not the correct explanation of A
C. A is correct , but R is incorrect
D. Both A and R are incorrect

Answer

A

Explanation

Most arthropods ,certain molluscs and tunicates have open circulatory system . In them , a fluid composed of blood mixed with tissue fluid , bathes the internal tissues and organs directly . It oozes through spaces or cavities that surround the organs , this mixture of fluid is usually referred to as haemolymph .