What explanation best accounts for the directional change in growth observed in
the plant shown?
Question 15 options:
More auxin is transported down the shady (right) side causing the plant to grow more on the shady side and bend in the direction of the light source.
The plant was initially grown in the dark, then was placed in the
sunlight causing the curve in the stem.
The plant was initially grown on its side in a tray of water, then
moved upright into a pot.
The plant was only watered on the left side of the pot, providing the necessary nutrients only to the left side of the plant.