The Rapid Leaf Movements Resulting from a Response to Touch

Question

The rapid leaf movements resulting from a response to touch (thigmotropism)primarily involve
A) rapid growth response.
B) potassium channels.
C) nervous tissue.
D) aquaporins.
E) stress proteins.

Accepted Answer

Rapid leaf movements resulting from thigmotropism primarily involve potassium channels. When a plant is touched or bumped, certain cells in the plant release calcium ions, which in turn activate potassium channels. The influx of potassium ions causes a rapid change in the water balance of the cells, resulting in a temporary change in turgor pressure and the rapid movement of the leaves.