37. Plant Sensation and Response

What is growth that results in curvatures of whole plant organs toward or away from stimuli called?

The immediate, direct effect of auxin in cell elongation, according to the acid growth hypothesis, is to __________.

In addition to interacting with auxin in the control of apical dominance, newly discovered plant hormones help to establish mycorrhizal associations by attracting mycorrhizal fungi to the plant roots. What are these hormones called?

A graduate student growing plant cells in a laboratory dish wants them to __________; therefore, the student treats them with cytokinins.

Test your knowledge of the five major classes of plant hormones (auxins, cytokinins, gibberellins, abscisic acid, ethylene) by matching one hormone to each lettered box. (Note that some hormones will match up to more than one box.)

During winter or periods of drought, which one of the following plant hormones inhibits growth and seed germination? a. ethylene b. abscisic acid c. gibberellin d. auxin