The Following Questions Refer to the Description and Table 28

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
$$\begin{array} { l l } \text { Material } & \text { Specific Gravity } ( \mathrm { kg } / / \mathrm { m }^{3} ) \\\text { Pure water } & 1000 \\\text { Seawater } & 1026 \\\text { Hydrated silica } & 2250 \\\text { Liquid laminarin } & 1500 \\\text { Diatom oil } & 910\end{array}$$
-The chloroplasts of land plants are thought to have been derived according to which evolutionary sequence?

A) cyanobacteria ? green algae ? land plants
B) cyanobacteria ? green algae ? fungi ? land plants
C) red algae ? brown algae ? green algae ? land plants
D) red algae ? cyanobacteria ? land plants
E) cyanobacteria ? red algae ? green algae ? land plants

Correct Answer:

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