Question 1

What is the definition of biotic potential?

Accepted Answer

Biotic potential is the maximum growth rate under ideal conditions.

Question 2

Currently the world population growth is approximately 1.2%.If the birthrate in 2009 was 19.86 per 1000,what was the death rate?

Accepted Answer

The death rate must be 7.86. 19.86 - 17.86 = 12, ÷ 1000, × 100 = 1.2%.

Question 3

Which of the following is not a way to reduce your ecological footprint?

Accepted Answer

The production of beef requires large amounts of resources, so the consumption of meat is not a way to reduce your ecological footprint.

Question 4

The population growth in less-developed countries is

Accepted Answer

The population growth in less-developed countries is dramatically increasing.

Question 5

There are more women in LDCs entering the reproductive years than there are older women who can no longer reproduce.

Accepted Answer

This is why LDCs are experiencing population growth.

Question 6

If the birthrate is 22 per 1000 per year and the death rate is 8 per 1000 per year,what is the population growth rate?

Accepted Answer

The growth rate is 22-8 divided by 1000 times 100 or 1.4%.

Question 7

Which of the following is a renewable resource?

Accepted Answer

Renewable resources are capable of being naturally replenished. Solar energy is an example.

Question 8

At least 40% of the world population lives within 100 km (60 miles)of a coastline.

Accepted Answer

This leads to significant environmental issues and the numbers are expected to increase.

Question 9

Birthrate and death rate are usually expressed as percentages (per 100 people).

Accepted Answer

Birthrate and death rate are usually expressed as per 1000 people.

Question 10

Define an ecological footprint.

Accepted Answer

An ecological footprint involves all of the resources, food, water, land, energy, and minerals a person uses to meet his/her needs.

Question 11

If each couple only has two children,zero population growth will take place immediately.

Accepted Answer

This is called replacement reproduction, and will not have the noted effect because in LDCs, more young women are entering the reproductive years than there are older women leaving the reproductive years. In addition, unless the death rate equals the reproduction rate, population growth will not immediately be zero.

Question 12

If there are more women in the postreproductive years than in the reproductive years,and more women in the reproductive years than in the prereproductive years,what does the age structure diagram look like?

Accepted Answer

The age structure diagram would look like an inverted pyramid because the postreproductive years are on top, the reproductive years are in the middle, and the prereproductive years are at the bottom.

Question 13

What is the current world's population?

Accepted Answer

The current world's population is slightly over 7 billion people.

Question 14

What happened to the death rate in LDCs following World War II? Why?

Accepted Answer

The death rate in LDCs decreased following WWII because of the introduction of modern medicine.

Question 15

In order to have a negative population growth rate,

Accepted Answer

In order for the growth rate to be negative, the death rate must be larger than the birth rate.

Question 16

What does the United States's population growth look like?

Accepted Answer

The population of the United States continues to increase due to increased immigration.

Question 17

The carrying capacity of Earth for humans is approximately 8 billion people.

Accepted Answer

The carrying capacity of Earth for humans has not been determined. Some estimate it may be 50-100 billion people. Others believe we have already exceeded it.

Question 18

How is the growth rate of a population determined?

Accepted Answer

The growth rate of a population is determined by considering the difference between the number of persons born per year and the number who die per year.

Question 19

The age structure diagram of MDCs is shaped like

Accepted Answer

The age structure diagram of MDCs is shaped like a rectangle because there are approximately the same number of women in the prereproductive, reproductive, and postreproductive years.

Question 20

The more-developed countries have typically always had low population growth rates.

Accepted Answer

The more-developed countries did not always have low population growth rates. Between 1850 and 1950, they doubled their populations.

Quiz 25: Human Interactions With the Biosphere