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GED Science Exam

Question No: 51

When a cell, such as a red blood cell, is placed in pure distilled water, water will move into the cell, causing it to expand and burst. However, most plant cells, which are surrounded by a tough cellulose wall, will not burst when placed in pure distilled water.

This information indicates which of the following statements about cells?

  1. A plant cell cannot survive in pure distilled water.

  2. Water can dissolve a cellulose wall.

  3. A cellulose wall can resist the expansion of the cell.

  4. A cellulose wall is sometimes found around an animal cell.

  5. A plant cell absorbs more water than an animal cell.

Answer: C

Question No: 52

A clear container of hydrogen peroxide breaks down to form water and oxygen in approximately one month. When an enzyme known as catalase is added to hydrogen peroxide, water and oxygen are formed almost immediately.

Which of the following actions explains why this effect of catalase is typical of an enzyme?

  1. acts as a preservative

  2. reacts with protein

  3. forms water and chlorine gas

  4. is used up in the reaction

  5. changes the rate of the reaction

Answer: E

Question No: 53

The digestive tract of an animal that eats meat is about four times the length of the animal’s body. In an animal that eats plants, the digestive tract is about twenty times the length of the animal’s body.

Which animal would be expected to have the longest digestive tract relative to its body length?

  1. dog

  2. cow

  3. house cat

  4. lion

  5. hawk

Answer: B

Question No: 54

Animal populations are regulated by a variety of natural factors. Five of these factors are:

->competition-A struggle among rival organisms results when available resources (for example, food or shelter) are limited.

->predation-Many animals pursue and eat other animals as prey.

->disease-In overcrowded populations, the buildup of waste products contributes to the easy spread of disease.

->stress-In some populations, overcrowding can lead to hormonal disorders, which can cause abnormal behavior, thereby limiting the population.

->natural disaster-The occurrence of storms, floods, and earthquakes can significantly affect a population’s size.

->During the Middle Ages, the human population of Western Europe was severely reduced by a combination of unsanitary conditions and the abundance of flea- infested rats that spread the plague.

Based on the information provided, which of the following factors was responsible for the population reduction?

  1. competition

  2. predation

  3. disease

  4. stress

  5. natural disaster

Answer: C

Question No: 55

Cholera is a disease caused by a bacterium that is transmitted by water, shellfish, and raw vegetables. The major symptom is severe diarrhea. Epidemics of cholera in the Americas, common in the 19th century, are much less frequent now with the advent of modern medicine and improved methods of hygiene.

However, in 1991, the number of cholera epidemics increased again in one South American country, causing over 4000 deaths.

The high number of cases of cholera in the South American country noted above was most probably due to which factor?

  1. prolonged smoking of cigarettes

  2. lack of variety in foods

  3. poor water and sewage treatment

  4. eating the wrong kinds of foods

  5. widespread overuse of antibiotics

Answer: C

Question No: 56

The disposal of solid wastes is a growing problem. One solution is to bury waste between layers of earth to build up low-lying land. Another solution is to burn waste to produce energy.

From an environmental perspective, what information is most needed to select the best method of maintaining a clean environment?

  1. the cost of recycling materials instead of burning

  2. the cost of burning materials

  3. the amount of pollutants produced by each procedure

  4. the amount of low-lying land available

  5. the laws pertaining to each procedure

Answer: C

Question No: 57

Juan is concerned about the amount of cholesterol in his diet; a person’s circulatory system can clog with this fatty material, and this blockage could cause a stroke or heart attack.

Which of the following foods would contribute the most to a buildup of cholesterol?

  1. butter

  2. fish

  3. spinach

  4. bread

  5. lean red meat

Answer: A

Question No: 58

Hot vapor from a cup of coffee forms droplets of liquid when the vapor passes over a cool spoon.

This condensation action is similar to which of the following?

  1. raindrops falling from the sky

  2. hail forming within a storm cloud

  3. a bathroom mirror fogging up

  4. steam rising from boiling water

  5. cold spray coming from a showerhead

Answer: C

Question No: 59

An object thrown straight up into the air eventually returns to Earth. As the object moves upward, the force of gravity pulls on the object, and its velocity will decrease until it stops. As the object falls back toward Earth, the force of gravity causes its velocity to increase.

At which point in the object’s pathway is its velocity at zero?

  1. when the object leaves the hand of the person throwing it

  2. when the object stops ascending and is about to descend

  3. when the object is halfway up into the air

  4. when the object is halfway down from its farthest point of ascent

  5. just before the object returns to Earth

Answer: B

Question No: 60

The waters of the Antarctic region contain an abundance of animal and plant life. The large number of living organisms stems partly from the water’s high mineral content and partly from the constant cold temperature. The continual flow of materials from below brings nitrates and phosphates into the surface zone. Cold water holds more dissolved carbon dioxide and oxygen than does warm water. The abundance of carbon dioxide and the available sunlight allow photosynthesis to occur in the surface waters almost continuously

during the long daylight hours in the summer.

If the temperature of the Antarctic waters increased by a marked degree, which of the following statements would explain a decrease in the abundant life there now?

  1. In warm water, oxygen and carbon dioxide combine to form ammonia and other poisonous gases.

  2. Warm water evaporates much more slowly than cold water.

  3. Warm water contains less dissolved carbon dioxide needed for photosynthesis.

  4. Minerals dissolve more readily in cold water.

  5. Warm water contains more oxygen than cold water.

Answer: C

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