Assertion (A): In echinoderms, water vascular system helps in excretion
Reason (R): In echinoderms excretory system is absent
1
Both (A) and (R) are true and (R) is the correct explanation of (A)
2
Both (A) and (R) are true and (R) is not correct explanation of (A)
3
(A) is false but (R) is true
4
(A) is true but (R) is false