Exam 39: Plant Responses to Internal and External Signals

For a plant to initiate chemical responses to herbivory, before it is directly affected by herbivores, ________.

Which of the colors of visible light induces curvature in coleoptile most effectively?

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 ________.

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 ________.

How may a plant respond to severe heat stress?

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) ________.

________ prevents seeds from germinating until conditions are favorable for the growth of the plant.

Generalized defense responses in organs distant from the infection site are called ________.

Arrange the following steps that occur during drought tolerance in plants in a correct sequence. I.hormone ABA accumulation in the leaves II.causes stomata to close III.reduction in transpiration IV.preventing further water loss

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

Auxin enhances cell elongation in all of these ways except

Which type of mutant would be most likely to produce a bushier phenotype?

Phytochrome plays a critical role in seed germination. Which of the colors maximizes the seed germination?

Which event during the evolution of land plants favored the synthesis of secondary compounds?

The detector of light during de-etiolation (greening) of a tomato plant is (are) ________.

Which of the following mechanisms is the correct sequence of events that takes place during the plant responses to internal and external signals?

As cytokinins are primarily produced in roots, what route would they travel to influence lateral shoot formation in a recently topped tree?

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?

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

The hormone that helps plants respond to drought is