Which of the Following is Not a Characteristic of Plant

Question

Which of the following is not a characteristic of plant hormones?
A) They affect only cells with an appropriate receptor.
B) They are able to move from one cell to another cell through extracellular spaces.
C) They change their shape in response to stimulus.
D) They can be transported by xylem or phloem sap.
E) They exist in plant in very tiny amounts.

Accepted Answer

Plant hormones do not change their shape in response to stimulus. They instead bind to specific receptors on the surface of target cells to initiate a signal cascade that leads to a physiological response.