Test Prep Section Three : Science GED Section 3: Science Dumps in PDF

Free Test Prep GED Section 3: Science Real Questions (page: 9)

-- 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 weatherduring 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 --
Rabbits are destroying a farmer's vegetable garden. Based on the food web, if the farmer removes the rabbits, which other organisms might be directly affected?

  1. foxes and snakes
  2. hawks and snakes
  3. grasshoppers and mice
  4. foxes and hawks
  5. grasshoppers and grass

Answer(s): D



Many years ago, beavers were introduced to a region of California that they had not previously inhabited. Forty years later, the beaver population had grown so much that a cluster of aspen trees used by the beavers for food and building materials inside the national forest became endangered. The beavers were also interfering with the water systems.
In retrospect, how would biologists most likely evaluate the impact of the introduction of the beaver?

  1. an important tool for controlling the aspen population
  2. a disruption of the forest ecosystem
  3. a model program for other animals
  4. very successful from an ecological viewpoint
  5. having no significant effect on the forest ecosystem

Answer(s): B



Exhibit:

Torque is the measure of a force that produces rotation. A wrench is used to loosen a bolt as shown at the left. The bolt is stuck, so it will require much more torque than is usually needed.
Which replacement given below is most likely to produce the required increase in torque for the wrench?

  1. a different color
  2. lighter in weight
  3. wider
  4. shorter
  5. longer

Answer(s): E



During cellular respiration, glucose and oxygen combine to yield energy. Water and carbon dioxide are formed as by-products. In this process, energy is released and stored in high- energy bonds of adenosine triphosphate (ATP). As it is needed, energy for the work of the cell is released by breaking the high-energy ATP bonds.
Which is the fundamental purpose of the process of respiration?

  1. to form glucose from carbon dioxide and water
  2. to provide energy for living things to store or use
  3. to produce oxygen as a by-product of the reaction
  4. to increase the work required to break an ATP bond
  5. to produce two cells from one cell through mitosis

Answer(s): B



In a population cycle, predators eat and reduce the number of prey. If the number of predators is reduced, the number of prey will gradually increase. Eventually, the predator population will increase, and the population cycle will continue.
Which pair best demonstrates a predator-prey relationship?

  1. honeybees and ants
  2. frogs and toads
  3. robins and pigeons
  4. sheep and cattle
  5. snakes and mice

Answer(s): E



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