Assertion: Runners are grown above the ground horizontally or prostrate develop at the base of erect shoots.
Reasoning:: Runners bear nodes and internodes.

Both Assertion (A) and reason (R) are correct but R is not the correct explanation of A.

Runners are special, narrow, green, above ground horizontal or prostrate branches which develop at the bases of erect shoots called crowns. Each runner has generally one or more nodes. The nodes bear scale leaves and axillary buds.