A: Sieve tubes and companion cells are related ontogenetically.
R: Both develop from same mother cell.
A. If both Assertion & Reason are true and the reason is the correct expalanation of the assertion. Then mark (1).
B. If Assertion & Reason are true but the reason is not the correct explanation of the assertion, then mark (2)
C. If Assertion is true statement but Reason is false, then mark (3).
D. If both Assertion and Reason are false statements, then mark (4)