Exam 37: Plant Sensory Systems, Signals, and Responses

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

Which of the following treatments would increase the level of the Pfr form of phytochrome?

Which of the following hormones would be most useful in promoting the rooting of plant cuttings?

A plant mutant that shows normal gravitropic bending but does not store starch in its plastids would require a reevaluation of the role of ________ in gravitropism.

Which of the following conclusions is supported by the research of both Went and Charles and Francis Darwin on shoot responses to light?

A short-day plant will flower only when ________.

If cells in the ________ are removed, roots will no longer respond to gravity.

Vines in tropical rain forests must grow toward large trees before being able to grow toward the sun. To reach a large tree, the most useful kind of growth movement for a tropical vine presumably would be ________.

Charles and Francis Darwin concluded from their experiments on phototropism by grass seedlings that the part of the seedling that detects the direction of light is the ________.

If you were shipping green bananas to a supermarket thousands of miles away, which of the following chemicals would you want to eliminate from the plants' environment?

When an arborist prunes a limb off a valuable tree, he or she may paint the cut surface with a nontoxic sealant. The primary purpose of the paint is to ________.

Which of the following signals indicates shade to a plant?

Plant hormonal regulation differs from animal hormonal regulation in that ________.

A plant seedling bends toward sunlight because ________.

Which of the following can be sensed by plants? I. gravity II. pathogens III. wind IV. light

Use the following information to answer the question below. Some plants continually produce secondary defense compounds. Other plants are induced to form secondary defense compounds when they are injured. Corn seedling leaves that are chewed on by the caterpillars of a type of cutworm moth emit immediate volatile chemicals (LOX products), and after 6 hours large amounts of terpenoid compounds are released into the air. The terpenoids are released not only from the leaf being chewed but from all leaves of the plant. The terpenoid compounds attract a parasitoid wasp female that lays her eggs on the caterpillar. When the wasp larvae hatch, they eat and kill the moth caterpillar. (T.C.J. Turlings, J. H. Loughrin, P. J. McCall, U. S. R. Rose, W. J. Lewis, and J. H. Tumlinson. 1995. How caterpillar-damaged plants protect themselves by attracting parasitic wasps. Refer to the paragraph on how caterpillar-damaged plants protect themselves by attracting parasitic wasps. What can you conclude based only on the information in the preceding paragraph?

What do thigmomorphogenesis, thigmotropism, and thigmonastic movements have in common?

Mammalian eyes sense light because the photoreceptor cells have molecules called opsins, which change structure when exposed to light. Which of the following plant molecules would be analogous to mammalian opsins in their light-sensing ability?

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 ________.

Many plants are capable of responding very rapidly to mechanical stimuli. For instance, Venus Flytraps respond more quickly than their insect prey can escape. A very mild touch or a light breeze can cause the leaves of the Sensitive Plant to close tightly. This rapid transmission of touch is accomplished by ________.