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Exam 39: Plant Responses to Internal and External Signals

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Question 1

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You are out working in your garden, and you notice that one of your favorite flowering plants has black, dead spots on the leaves. You immediately suspect that the plant has been invaded by a pathogen and has initiated a(n) ________.

A) avirulence response
B) hypersensitive response
C) resistance response
D) virulence response

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Question 2

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Use the figure to answer the following question. Suppose you laid a seedling on its side so that the root was parallel to the ground as shown in the figure. Several hours after the change in position, where in the root cells, position A, B, or C in the figure, would you find the amyloplasts?

A) A
B) B
C) C
D) A and C

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Question 3

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Auxins in plants are known to affect which of the following processes? I gravitropism of shoots II maintenance of seed dormancy III phototropism of shoots IV inhibition of lateral buds V apical dominance

Auxin enhances cell elongation in all of these ways except

How may a plant respond to severe heat stress?

Which of the following mechanisms is in the correct sequence of steps (I-IV as listed below) that takes place during the formation of de-etiolation (greening) response proteins in plants? I Detection of light signal II Activation of phytochrome III Activation of specific protein kinase1 IV Formation of de-etiolation response protein

Apical dominance in plants is under the control of ________.

A population of plants experiences several years of severe drought. Much of the population dies due to lack of water, but a few individuals survive. You set out to discover the physiological basis for their adaptation to such an extreme environmental change. You hypothesize that the survivors have the ability to synthesize higher levels of ________ than their siblings do.

Shoots that grow vertically toward the sun can be characterized as ________.

What are the primary sites of ethylene production in high concentrations in plants?

Plants often use changes in day length (photoperiod) to trigger events such as dormancy and flowering. It is logical that plants have evolved this mechanism because photoperiod changes ________.

Upon exposure to blue light, plants not only begin to grow toward the light, but move their chloroplasts to the sunny side of each cell. The adaptive advantage of moving chloroplasts to the sunny side of each cell ________.

Generally, each hormone has multiple functions in plants depending on ________. I site of action II its concentration III developmental stage IV age

If a farmer wanted more loosely packed clusters of grapes, he would most likely spray the immature bunches with ________.

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

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 ________.

You have a small tree in your yard that is the height that you want it, but does not have as many branches as you want. How can you prune it to trigger it to increase the number of branches?

Plant hormones ________.

Which of the following statements best summarizes the acid growth hypothesis in an actively growing shoot?

Which of the following can function in signal transduction in plants? I calcium ions II nonrandom mutations III receptor proteins IV autochrome V secondary messengers