Biology Chapter 5

Question 0

What is geographic distribution?

Answer 0

Geographic distribution, or range, describes an inhabited area of a population

Question 1

What are the three main characteristics of a population?

Answer 1

Geographic Distribution, Density, and Growth Rate

Question 2

What is density?

Answer 2

The amount of something in a given unit of area.

Question 3

What three factors can affect population size?

Answer 3

Births, deaths, and imm/emigration

Question 4

What is the difference between immigration and emigration?

Answer 4

Immigration means moving in, emigration means moving out.

Question 5

Why might an organism change location?

Answer 5

Looking for a mate or food.

Question 6

What is exponential growth?

Answer 6

It is when individuals constantly reproduce

Question 7

What shape does a line on a graph of exponential growth make?

Answer 7

J-shape

Question 8

What happens when exponential growth stops?

Answer 8

The carrying capacity is reached.

Question 9

True or false: The time it takes an organism to reproduce affects exponential growth.

Answer 9

False

Question 10

What is logistic growth and when does it occur?

Answer 10

It is when population growth slows after exponential growth.

Question 11

What shape does a line on a logistic growth graph make?

Answer 11

S-shape

Question 12

What is it called when a population reaches the maximum population it can possibly hold?

Answer 12

Carrying capacity.

Question 13

What is a limiting factor?

Answer 13

A factor that causes population to decrease.

Question 14

What is an example of a limiting factor?

Answer 14

A limiting nutrient.

Question 15

What is a density-dependent limiting factor?

Answer 15

Factors that prevail or fail depending on the density of a given population.

Question 16

When does a density-dependent factor become limiting?

Answer 16

When the population shrinks to a certain amount.

Question 17

What are examples of a density-dependent limiting factor?

Answer 17

Competition, predation, parasitism, and disease.

Question 18

How are parasites like predators?

Answer 18

Both benefit at the demise of another organism.

Question 19

What is a density-independent limiting factor?

Answer 19

A factor that affects a population regardless of its size.

Question 20

What are examples of density-independent limiting factors?

Answer 20

Unusual weather, natural disasters, seasonal cycles (i.e. droughts), and some human activity

Question 21

What usually happens to a population affected by a density-independent limiting factor?

Answer 21

It recovers but after it drops.

Question 22

What is the current trend of the human population?

Answer 22

Exponential growth

Question 23

Why was population growth not significant 2000 years ago?

Answer 23

Life expectancy was not a large number.

Question 24

Will the human population grow forever? Why?

Answer 24

No because Earth has limited resources.

Question 25

What is demography?

Answer 25

The scientific study of populations.

Question 26

What factors can be used to predict human population change?

Answer 26

Birth rates, death rates, and age structure.

Question 27

Why has population slowed in some parts of the world?

Answer 27

Demographic transition.

Question 28

What factors have helped lower death rates?

Answer 28

Better nutrition, sanitation, and medicine.

Question 29

True or false: As countries finish the demographic transition, human population growth will slow down.

Answer 29

True

Question 30

What will probably happen if human population growth does not slow down?

Answer 30

Serious damage to the environment and economy.

Question 31

What is the estimated human population in 2050?

Answer 31

9 billion