The Following Questions Refer to the Description and Table 28

question 8

Multiple Choice

The following questions refer to the description and Table 28.1 below.
Diatoms are encased in Petri-plate-like cases (valves) made of translucent hydrated silica whose thickness can be varied. The material used to store excess calories can also be varied. At certain times, diatoms store excess calories in the form of the liquid polysaccharide, laminarin, and at other times, as oil. Below are data concerning the density (specific gravity) of various components of diatoms, and of their environment.
Table 28.1: Specific Gravities of Materials Relevant to Diatoms
$$\begin{array} { l l } \text { Material } & \text { Specific Gravity } ( \mathrm { kg } / / \mathrm { m }^{3} ) \\\text { Pure water } & 1000 \\\text { Seawater } & 1026 \\\text { Hydrated silica } & 2250 \\\text { Liquid laminarin } & 1500 \\\text { Diatom oil } & 910\end{array}$$
-Which taxon of eukaryotic organisms is thought to be directly ancestral to the plant kingdom?

• A)golden algae
• B)radiolarians
• C)foraminiferans
• D)apicomplexans
• E)green algae

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Definitions:

Gestalt Psychologists

Scholars who emphasize that the mind tends to perceive objects as part of a greater whole and as elements of more complex systems.

Visual Perception

The ability to interpret and make sense of visual information from the environment through the process of sight.

Absolute Sensory Threshold

The minimum intensity of a stimulus that is required for a person to detect its presence 50% of the time.

Audition

The process of hearing or the ability to perceive sound by detecting vibrations via an organ such as the ear.