Pre-test Answers for "Welcome to Your World"

1. The major source of energy for Earth is/are _____.

A. oil
B. the Sun (Objective 1)
C. the producers of electricity
D. heat
E. coal

2. Plants use _____ and _____ to form sugar.

A. oxygen; carbon dioxide
B. sunlight; oxygen
C. carbon dioxide; glucose
D. glucose; oxygen
E. carbon dioxide; sunlight (Objective 2)

3. A food chain is a series of organisms that transfer _____ between different
levels of an ecosystem.

A. information
B. food (Objective 1)
C. heat
D. nitrogen
E. oxygen

4. If you switched to an all plant diet, you would be classified as a(n) _____.

A. producer
B. decomposer
C. omnivore
D. carnivore
E. consumer (Objective 1)

5. Which of the following CANNOT be recycled?

A. energy (Objective 2)
B. water
C. carbon
D. nitrogen
E. oxygen

6. The conversion of water from a liquid to a gaseous form is known as _____.

A. dehydration
B. precipitation
C. evaporation (Objective 2)
D. condensation
E. reconstitution

7. The majority of the Earth's water is _____.

A. found in the oceans
B. stored in clouds
C. frozen as ice at the North and South Pole
D. in rivers, streams, and lakes
E. unavailable beneath the Earth's surface (Objective 2)

8. Which of the following is an important store for carbon dioxide?

A. rocks
B. oceans
C. the atmosphere
D. fossil fuels
E. all of these are important stores for carbon dioxide (Objective 2)

9. Nitrogen is required by organisms to produce _____.

A. oxygen
B. amino acids (Objective 2)
C. fats
D. cholesterol
E. nitrates

10. What is the correct formula for Risk?

A. Risk = Toxicity / Exposure
B. Risk = Toxicity + Exposure
C. Risk = Toxicity - Exposure
D. Risk = Toxicity x Exposure (Objective 3)
E. Risk = Toxicity + 1/Exposure

11. If a very toxic substance is stored in a way that no one is exposed to it, the risk
of injury or toxicity is ______:

A. none (Objective 3)
B. low
C. medium
D. high
E. unable to be determined

12. All of the following are usual ways in which a compound can enter the body,

A. eating the compound
B. drinking water contaminated with the compound
C. inhaling the compound
D. injection into the skin by a mosquito (Objective 3)
E. coming in contact with the compound through the skin

Post-test Answers for "Welcome to Your World"

1. The majority of the Sun's energy is captured by _____, which are known as _____.

A. plants; consumers
B. animals; producers
C. animals; decomposers
D. plants; producers (Objective 1)
E. plants; decomposers

2. Biomass is the term for _____ in the environment.

A. all of the organic materials (Objective 1)
B. all of the living organisms
C. all of the plants
D. only the animals
E. only the oxygen-consuming organisms

3. The term "omnivore" is used to describe an organism that consumes:

A. only plants
B. only animals
C. both plants and animals (Objective 1)
D. only dead animals
E. both live and dead animals

4. Decomposers are important because _____.

A. they produce energy from sunlight
B. they convert energy into sugars and release tremendous amounts of oxygen into the atmosphere
C. they convert wastes into inorganic components for producers to use (Objective 1)
D. they consume energy from producers and produce large volumes of carbon dioxide into the atmosphere
E. they utilize heat as a source of energy

5. Formation of water vapor taken from the leaves of plants is called _____.

A. condensation
B. precipitation
C. dehydration
D. transpiration (Objective 2)
E. accumulation

6. Which of the following organisms use carbon dioxide to make energy?

A. a dog
B. an apple tree (Objective 2)
C. a bullfrog
D. a hammerhead shark
E. all of these use carbon dioxide to produce energy

7. In order for nitrogen to be usable by most organisms, it must be_____.

A. converted to oxygen
B. fixed (Objective 2)
C. reduced to sugars
D. released into the atmosphere
E. split

8. Which of the following statements concerning toxicity of compounds is TRUE?

A. Toxic compounds are equally toxic to people and animals
B. If a compound is toxic to people, it is not beneficial to people
C. How much of a toxic compound a person is exposed to is as important as its toxicity (Objective 3)
D. Some environmental toxicants have a positive or beneficial impact on living organisms
E. Most environmental toxicants enter the body by coming in contact with another individual who has been exposed to the toxicant

9. The risk of toxicity is _____ the exposure.

A. inversely related to
B. directly related to (Objective 3)
C. important in determining
D. independent of
E. not related to

10. If you encounter a high-level of a non-toxic substance, your risk of injury or illness is ______:

A. none (Objective 3)
B. low
C. medium
D. high
E. unable to be determined

11. In order to minimize your risk of chemical toxicity you can ______:

A. decrease the toxicity of the compound
B. increase the level of good chemicals in the environment
C. decrease your exposure to the compound (Objective 3)
D. increase your exposure to good chemicals
E. decrease the amount of time you spend outside

12. If a compound is toxic,____.

A. then it is toxic to all living things
B. its toxicity can vary from individual to individual (Objective 3)
C. only high exposure has risk
D. its more toxic if eaten than if inhaled
E. exposure cannot be avoided