Exam 38: Plant Developmental Responses to External and Internal Signals

What is the hormone that promotes stem elongation and was first discovered while studying the growth of extremely tall and spindly rice plants?

Figure 38-1 Use the figure to answer the corresponding question(s). -Based on the data in Figure 38-1, the condition that results in root development is:

What am I? I am present in reduced amounts in dwarf plants, and I stimulate bolting in many species.

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -the main hormone involved in phototropism

A circadian rhythm has a period that approximates a 12-hour cycle.

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -exhibits polar transport

The twining of tendrils around a support is an example of thigmomorphogenesis. ____________________

What is the hormone that promotes cell elongation by changing plant cell walls so they can expand due to the force of turgor pressure?

In a hypersensitive response:

Abscisic acid stimulates the abscission of leaves. ____________________

Who am I? I am a lipid-derived hormone produced in response to the presence of insect pests.

Describe the evidence for the existence of a flowering promoter and also for the existence of a flowering inhibitor.

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -a derivative of adenine

Which of the following would not be characteristic of a plant exhibiting shade avoidance?

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -promotes the growth of lateral buds

Methyl salicylate triggers the genes that code for the systemic acquired resistance pathway.

In barley seed germination, the __________ releases gibberellin which triggers the synthesis of __________ in the __________.

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -stimulates fruit ripening

The application of __________ substitutes for low temperature or light requirements for biennial germination.

MATCHING Match the plant hormone with its description. a.abscisic acid d.cytokinin b.auxin e.ethylene c.brassinosteroid f.gibberellin -induces seed dormancy