GED-Science 試験問題を無料オンラインアクセス

In a suspension, the particles are larger and tend to settle out; in a solution, the particles are microscopic and do not settle out. Pure substances contain only one compound and are not mixtures.
Exhibit:

The contents in the container probably represent which of the following?

• A.a dilute solution
• B.a saturated solution
• C.a pure substance
• D.a supersaturated solution
• E.a suspension

Cells are the building blocks of the human body. Cancer cells differ from healthy cells in their rate of reproduction; they divide in an uncontrollable and rapid manner and may spread to areas of the body where they do not belong. A cancerous lung cell may be found in any other organ it invades. When cancer cells reproduce, they produce other cancer cells.
Based on the information above, which statement identifies a characteristic of cancer cells?

• A.divide to form normal, healthy cells
• B.divide slowly and in a controlled manner
• C.do not spread into other organs from the original ones where they were formed
• D.are formed only in the human digestive system
• E.divide much more often in the same time period than do normal, healthy cells

-- Exhibit -
The most realistic description of energy flow through an ecosystem is a food web that represents an interconnected series of food chains. In general, the greater the number of alternative channels through which energy can flow, the greater the stability of the food web and the ecosystem.

The diagram shows a typical food web for a wet meadow. The hawk and the fox obtain nourishment by preying upon rabbits, frogs, snakes, and mice. The fox may even eat grasshoppers. If, for example, the rabbit population is reduced, possibly because of bad weather during the breeding season, the fox and hawk would shift their predatory pressure to other forms of prey. The rabbit population would then have a chance to bounce back and the ecosystem would remain stable.
-- Exhibit -
Based on the diagram, which consumer would have the greatest chance of surviving if the amount of available prey changes during the different seasons?

• A.mice
• B.rabbits
• C.snakes
• D.foxes
• E.hawks

Which is a useful way of reducing acidification of a lake?

• A.decreasing the lake's plants
• B.adding calcium compounds to the lake water
• C.stocking the lake with large fish
• D.increasing acid emissions from a local power plant
• E.adding phosphates to the surrounding soil

Exhibit:

Based on the graph at the left, which statement is FALSE?

• A.Asia has more coal than the other continents combined.
• B.Only one continent has over 10,000 billion tons of coal.
• C.Africa has more coal reserves than Europe.
• D.Asia has more coal than any other continent.
• E.North America has over 4000 billion tons of coal.