Exam 37: Plant Signals and Responses to the Environment

Where is the growth-promoting substance that promotes stem elongation and bending toward light primarily produced?

Which of the following are chaperone-type proteins that stabilize other proteins in response to environmental stresses such as salinity, drought, heat, and cold?

Which hormone's reduction in its amount causes a bush to become more bushy (have more lateral growth) after trimming a shrub?

Specific cells in developing seeds and maturing fruits have receptors for ethylene, but cells in stems generally do not.

Which plant hormones cause chloroplasts to mature?

Which of the following would probably NOT promote dormancy in at least some plants?

Which type of plant signalling molecule is similar in structure to aspirin?

An agar block filled with auxin is placed on top of a shoot that has had the shoot tip removed. The agar block is placed so that it covers only one side of the top of the shoot. Which of the following should occur?

Explain the hypersensitive response.

Choose the type of plant chemical or its action most closely associated with the consequence listed below. Each chemical or action may be used more than once. -operating in systemic acquired resistance

Placing a ripe apple with other apples that are not ripe will cause the other apples to ripen sooner. Which type of plant hormone is responsible for this effect?

When a plant becomes infected by pathogenic bacteria or fungi, it may respond by way of a fight or flight response-a defence that cordons off an infection site surrounding it with dead cells.

Suppose you are culturing tobacco in a petri dish at a 10:1 ratio of auxin to cytokinin. What would you do in order to promote only shoot development?

What are the usual concentrations of plant hormones that are effective, and what kind of effects do they have on different plant tissues?

Choose the type of plant chemical or its action most closely associated with the consequence listed below. Each chemical or action may be used more than once. -synthesizing defensive chemicals

What do we call plant responses to the relative lengths of light and dark periods in their environment during each 24-hour period?

Which type of plant hormone has been shown to both promote pollen tube elongation and inhibit root elongation?

Where is the auxin receptor ABP1 located in plant cells?

Which of the following serves as a switching mechanism in the photoperiodic response in plants?

Where are abscisic acid receptors located in plant cells?