The compound 2,4,5-trichlorophenoxyacetic acid is a synthetic auxin that is used as an herbicide. It is applied by spraying it on the plant
After spraying with synthetic auxin, the
plant undergoes a short period of what appears to be rapid growth and then wilts and dies.
Which of the following statements could explain how a synthetic auxin kills weeds?
A. The herbicide causes the leaves to grow
quickly. More photosynthesis occurs, but the
increase in sugar production blocks phloem
vessels and the plant dies.
B. The plant grows so rapidly that the cellular
integrity of the plant is destroyed (i.e., cell
walls break down), damaging transport
systems within the plant.
C. Spraying the plant clogs the stomata, so
photosynthesis can no longer occur.
D. The synthetic auxin cannot move through
PIN channels, thus destroying the natural
auxin concentration gradient and inhibiting
growth.
B
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