You notice that one of your bean plants has a stem that does not grow in the same direction as all the other bean plants. This plant stem branches often and grows in random directions. This plant most likely lacks which of the following hormones?

Question

Quizplus · Accepted Answer

The hormone auxin plays a key role in regulating the direction of plant growth by controlling cell elongation. When there is an uneven distribution of auxins in the plant, as in the case of a plant lacking auxins, it can cause the stem to grow in a random and uncontrolled manner. The branching and random growth of the stem described in the scenario is consistent with a lack of auxins.

You Notice That One of Your Bean Plants Has a Stem