The Following Questions Refer to the Evolutionary Tree in Figure

question 39

Multiple Choice

The following questions refer to the evolutionary tree in Figure 22.2.
The horizontal axis of the cladogram depicted below is a timeline that extends from 100,000 years ago to the present; the vertical axis represents nothing in particular. The labeled branch points on the tree (V-Z) represent various common ancestors. Let's say that only since 50,000 years ago has there been enough variation between the lineages depicted here to separate them into distinct species, and only the tips of the lineages on this tree represent distinct species.

Figure 22.2
-Which of the five common ancestors, labeled V-Z, has been least successful in terms of the percent of its derived species that are extant?

• A) V
• B) W
• C) X
• D) Y
• E) Z

Recognize the interplay between different plant hormones in regulating plant processes such as senescence and branching.

Understand the role and functionality of phototropins and their involvement in plant responses to light.

Learn the conditions necessary for the germination of seeds, particularly the influence of light wavelengths (red, far-red, and blue light).

Identify and describe the utilization of mutant Arabidopsis plants in studying plant responses to light.

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Definitions:

Productive Avoidance

A behavior or strategy focusing on doing useful tasks as a means to avoid confronting more challenging or discomforting issues.

A Tasks

Tasks that are defined as primary and crucial for the accomplishment of a specific goal or objective.

Homeostasis

The tendency of a system, especially the physiological system of higher animals, to maintain internal stability, due to the coordinated response of its parts to any situation or stimulus that would disturb its normal condition.

Stress

A state of mental or emotional strain resulting from adverse or demanding circumstances.