Exam 36: Regulation of Plant Growth

Refer to the figure below, showing lettuce seeds exposed to different experimental conditions. Both sets of seeds were exposed to red light, but the seeds on the right were subsequently exposed to _______ light.

Refer to the figure below. Is this seedling a monocot or a eudicot? Explain your answer.

Production of auxin in response to light most likely involves

Growth of a shoot tip toward the light, which is called phototropism, is thought to be mediated by the actions of _______.

Which of the following do seeds take up during imbibition?

P_r absorbs _______ light.

A new variety of geranium is found that, unlike other members of the genus, grows for a year as a squat, short plant, and then bolts to produce a tall stem with many flowers.What hormone is most likely produced in large amounts just before bolting?

Refer to the figure below showing a signal reception pathway. A mutant plant with an inactive form of the repressor protein (for auxin or gibberellin) is compared to a typical plant.Predict the results of this experiment.

A scientist has planted the seeds of a desert shrub at different depths.The only seeds that have germinated are those closest to the surface.This is probably because the successfully germinated seeds were exposed to more

Refer to the figure below, showing the portion of the visible spectrum detected by phytochrome. Predict the most likely response of a plant to the portion of the visible spectrum with its peak at 730 nm.

You are given a sample of seeds to analyze and are told that the germination process may have begun.If this is the case, the seeds will

In plant seeds that germinate in response to a brief pulse of light, _______ is most effective in triggering germination.

In a classic experiment, a gelatin block containing auxin was placed on one edge of a decapitated coleoptile.The result was that the coleoptile

Phototropin is a

Which statement is false?

Leaf abscission involves

Which of the following statements about phytochrome P_r is true?

What property of auxin allows it to diffuse across the plasma membrane during polar transport?

If you placed an auxin-containing agar block off-center on the cut top surface of a sunflower seedling, you would expect, after a day, to find that the sunflower had

Supermarkets sell plastic bags that are impregnated with activated charcoal, which binds gases.The bags are designed to keep fruit fresh.How do they work?