A young seedling was fixed sideways to a wooden board coated with damp blotting paper. It was placed inside a dark box. After 24 hours, the diagram shows the seedling. Auxin had collected on the lower side of the shoot and the root. What can be concluded from this experiment about the effect of auxin on the seedling?
- AA high concentration of auxin stimulates cell elongation on the lower side of the root.
- BA high concentration of auxin stimulates cell elongation on the lower side of the shoot.
- CA low concentration of auxin stimulates cell elongation on the upper side of the shoot.
- DA low concentration of auxin stimulates cell elongation on the upper sides of the shoot and the root.