Which statement correctly describes how sucrose and amino acids are transported in plant vascular tissue?
- AThey are carried from source to sink by mass flow in upward and downward directions.
- BThey are carried from sink to source by cohesion-tension in upward and downward directions.
- CThey are carried from sink to source by mass flow in one direction.
- DThey are carried from source to sink by cohesion-tension in one direction.