Which of the following plant growth responses is primarily due to the action of auxins?
A) leaf abscission
B) the triple response of shoots
C) cell division
D) the detection of photoperiod
E) cell elongation

Question

Quizplus · Accepted Answer

Cell elongation is primarily due to the action of auxins. Auxins promote cell elongation by increasing the plasticity of the cell wall and stimulating proton pumps that pump hydrogen ions into the cell wall, causing it to become more acidic and allowing for the expansion of the cell. Other growth responses listed such as leaf abscission, the triple response of shoots, and the detection of photoperiod are primarily due to other plant hormones, such as abscisic acid, gibberellins, and cytokinins respectively. Cell division is controlled by multiple hormones, including auxins but also cytokinins and gibberellins.

Which of the Following Plant Growth Responses Is Primarily Due