Environmental Quiz

Approximately what percent of the population in Country II is under age 15?

25%

For a certain insecticide, the LD-50 dosage level for rats is determined to be 250 milligrams per kilograms of body mass. On the basis of this information, which of the following is the best prediction regarding the consequences of receiving this dosage of the insecticide?

500 out of every 1000 rats would die

Countries undergoing rapid populations growth include which of the following?

I

Which of the following best describes the first law of thermodynamics?

In a closed system of constant mass, the energy involved in any physical or chemical change is neither created nor destroyed, but merely changed from one form to another.

Which of the following best illustrates an abiotic component of the environment affecting a biotic component of the environment?

Low phosphorus content in soil limits the growth of vegetation.

Which of the following is most typically associated with the transition from a rural to an urbanized society?

Reduced birth rates

During which stage of the demographic transition shown above does a population begin to experience an explosive increase in growth?

Stage 2

Losses of usable energy between successive trophic levels in an ecosystem are best accounted for by which of the following?

The second law of thermodynamics

Which of the following best describes soil in many tropical rain forests?

They are quickly depleted of nutrients when the forest is removed

The rate of population growth starts to slow down at which point?

beginning of phase 2

In a human population undergoing the demographic transition, which of the following generally decreases first?

death rate

The consumption of mosquitoes by bats and the control of flooding provided by tropical forests in mountainous areas of Central America are examples of

ecosystem services

Which of the following is most likely the primary cause of high death rates in phase I?

infant and child mortality

A country with an age distribution like that shown in the figure above, is most likely a country that

is experiencing slow or no population growth

Zero population growth is associated with

phase 1 and 4

Country with the largest area of boreal forests

russia

An energy transformation occurs and results in increased disorder.

second law of thermodynamics