Which of the Following Plant Growth Responses is Primarily Due

Question

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

Accepted Answer

Auxins are known to primarily promote and regulate cell elongation in plants. While they do have other functions, such as promoting cell division and fruit development, these functions are not primarily due to the action of auxins. Leaf abscission (the dropping of leaves) is not directly regulated by auxins, but rather by changes in the balance of auxins and other hormones. Photoperiod (the detection of day length) is mainly regulated by phytochromes, not auxins.