Exam 39: Plant Responses to Internal and External Signals

Plants growing in a partially dark environment will grow toward light in a response called phototropism. Which of the following statements is true regarding phototropism?

A flash of red light followed by a flash of far-red light given during the middle of the night to a short-day plant will likely

The aleurone layer is stimulated to release ________ and ________ as a result of giberrellin release from the embryo.

Auxins (IAA)in plants are known to affect all of the following phenomena except

Plants are affected by an array of pathogens. Which of the following is a likely plant defense/response against disease?

The signaling molecule for flowering might be released earlier than usual in a long-day plant exposed to flashes of

Why might animal hormones function differently than plant hormones?

If a long-day plant has a critical night length of 9 hours, which 24-hour cycle would prevent flowering?

Which plant hormones would likely be found in high amounts in a sprouting vegetative stem?

Which of the following is a likely response of plants to cold stress?

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

If protein synthesis was blocked in etiolated cells, what would be necessary for the "greening" of these cells?

External stimuli would be received most quickly by a plant cell if the receptors for signal transduction were located in the

Which of the following is the most likely plant response to an attack by herbivores?

If you wanted to genetically engineer a plant to be more resistant to drought, increasing amounts of which of the following hormones might be a good first attempt?

Bald cypress and loblolly pine are both gymnosperm trees native to the southern United States. The cypress grows in swamps; the pine grows in sandy soil. How do you think their anatomies differ?

Plant hormones produce their effects by

Plant cells begin synthesizing large quantities of heat-shock proteins

What does a short-day plant require in order to flower?

Which of the following is a major mechanism whereby hormones control plant development?