QUESTION: 73

Each year, approximately 200 million tons of municipal solid waste are generated in the United States. Incineration (burning), recycling, landfills, reduce-reuse, and composting are all possible ways to reduce the amount of waste in this country. When selecting the best approach to this problem, officials must carefully consider the risks and benefits of each method.
Which disposal method will produce the most toxic air pollution?

composting
incineration
landfills
recycling
reduce-reuse

Answer(s): B

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QUESTION: 74

A newly hatched chicken will peck at any spots on the ground that are a color different from the ground. This behavior is instinctive and only about 15 percent of the pecks lead to food. However, with time, the chick's accuracy in using pecks to pick up food improves.
To what can we attribute this more accurate feeding behavior?

The mother hen instructed the young chick.
Information was obtained from other chicks.
Trial and error on the part of the chick improved feeding success.
More food was made available to the chick.
The chick competed with other chicks.

Answer(s): C

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QUESTION: 75

A major volcanic eruption put large amounts of dust into the upper atmosphere. For three years following the eruption, Earth's weather was cooler than normal. Which of the following is NOT a testable hypothesis regarding the relationship between the eruption and the weather?

Volcanic dust can reduce the amount of sunlight entering Earth's atmosphere.
The magnitude of an eruption determines the amount of dust injected into the atmosphere.
The smallest volcanic dust particles can remain in the atmosphere for years.
If a planet is outside our solar system, volcanic eruptions will affect its weather.
Clumps of dust particles can aid cloud formation by acting as sites for condensation.

Answer(s): D

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QUESTION: 76

A compound is composed of atoms from two or more elements that are chemically bonded. Some examples of common compounds are water, alcohol, and sugar.
A compound can be represented in a number of ways. One is the structural diagram, which depicts each atom within a compound and the bonds that join those atoms. Another representation is the molecular formula, a shorthand notation of the elements and numbers of atoms of each element in a single molecule of the compound.

The following structural diagram represents isopropanol, commonly referred to as isopropyl (rubbing) alcohol.
Based on the structural diagram to the left, which molecular formula represents isopropyl alcohol?

C2H4OH
C2H5OH
C3H3OH
C3H7OH
C4H4OH

Answer(s): D

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