Assertion : long distance flow of phtoassimilates in plants occurs through sieve tubes.
Reason: mature seive tubes have parietal cytoplasm
A. If both assertion and reason are true and the reason is a corect explanation of the assertion
B. If both assertion and reason are true but reason is not a correct explanation of the assertion
C. If the assetion is true but reason is false
D. If both the assertion and reason are false