Exam 31: Plant Responses to Internal and External Signals

When growing plants in culture, IAA is used to stimulate cell enlargement. Which plant growth regulator has to now be added to stimulate cell division?

The detector of light during de-etiolation (greening) of a tomato plant is

The plant hormone involved in stimulation of stem elongation is

You are part of a desert plant research team trying to discover crops that will be productive in arid climates. You discover a plant that produces a hormone under water-deficit conditions that triggers a suite of drought responses. Most likely the hormone is

Figure 31.2 -This experiment suggests that the optimum amount of gibberellin in the experiment is approximately

Many plants flower in response to day-length cues. Which of the following statements best summarizes this phenomenon?

Plant hormones produce their effects by

Which of the following would only be activated or upregulated after a plant has already been infected by a pathogen?

Plants often use changes in day length (photoperiod) to trigger events such as dormancy and flowering. It is logical that plants have evolved this mechanism because photoperiod changes

Young leaves and developing seeds are the prime sites for ________ synthesis.

Auxin enhances cell elongation in all of these ways except

The initial response of the root cells of a tomato plant watered with seawater would be to

In legumes, it has been shown that "sleep" movements are correlated with

In order for a plant to initiate chemical responses to herbivory,

A long-day plant will flower if

If the range of a species of plants expands to a higher latitude, which of the following processes is the most likely to be modified by natural selection?

The transduction pathway that activates systemic acquired resistance in plants is initially signaled by

Figure 31.2 -The results of this experiment, shown on the left of the graph (area A), may be used to

The hormone that helps plants respond to drought is

A long-day plant will flower