Auxins trigger vertical growth, wherein the cell elongates in response to the direction of light and gravity. Usually, these hormones are produced at the roots or the apical meristem of a plant. When trees grow tall and upright, there is a presence of auxins in the apical meristem.

E. I, II, and III

Ethylene stimulates the ripening process in fruits.

C. ethylene

Thigmotropism refers to the way plants respond to touch. An example of this tropism is the way vines and climbing plants grow around an object by wrapping around it.

B. climbing vines

Salt tolerance is an adaption of an aquatic plant that grows in saltwater.

E. salt tolerance

A short-day plant grows flowers when they are exposed to short hours of daylight and long hours of darkness. A short day plant needs 10 hours of light and 14 hours of darkness in order to bloom flowers. This photoperiodism is caused by phytochrome that allows a plant to detect red light and absorb it.

E. I, II, and III

The growth of lateral buds eventually form into side branches.

A. lateral bud

Winter dormancy occurs when a cold temperature signals the trees to stop photosynthesis and to seal off the leaves from the rest of the tree.

E. dormancy

Gibberellins are the hormones that help increase the growth rate of stems and fruits.

C. Gibberellin

The auxins that are produced and accumulated in the tips of the shoot has caused it to bend.

D. Compounds produced in shoot tips can cause stems to bend.

The auxins, which are responsible for cell elongation, has accumulated in one side of the stem. This event caused the stem to bend. Cytokinins, on the other hand, are responsible for lateral growth. Therefore, only I applies to the results of the experiment.

A. I only