Assertion: Movement of materials inside phloem is bidirectional i.e. it can be both upwards or downwards.
Reason: Movement of molecules inside xylem is unidirectional i.e. always upwards.
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true but R is not correct explanation of A
(c) A is true but R is false
(d) A and R are false