Population Dynamics and Factors Influencing Size Changes

Ms. Riggs explains the concept of populations, their growth, and factors affecting them. She distinguishes between species and populations, describes different population dispersions, and discusses how populations grow through births and deaths. The video covers exponential growth, carrying capacity, and factors like food and predation that regulate populations. It concludes with a note on density-dependent and independent factors and offers extra credit for students who watch the entire video.

What is the main difference between a species and a population?

• A species is a group of organisms that can interbreed, while a population is a group of the same species in one area.

• A species is a group of organisms in one area, while a population is a group of different species.

• A species is a group of organisms that cannot interbreed, while a population is a group of the same species in one area.

• A species is a group of organisms in one area, while a population is a group of the same species spread out.

Which type of population dispersion is characterized by organisms forming social groups?

• Territorial dispersion

• Random dispersion

• Uniform dispersion

• Clumped dispersion

What is the formula for calculating a change in population size?

• Deaths minus births

• Births times deaths

• Births minus deaths

• Births plus deaths

What happens to a population's growth rate when the average number of births equals the average number of deaths?

• The population becomes extinct

• The population remains stable

• The population declines

• The population grows exponentially

Which organisms typically have shorter generation times and produce more offspring?

• Larger organisms

• Smaller organisms

• Organisms with long lifespans

• Organisms with high survival rates

What is carrying capacity?

• The average number of offspring produced by a species

• The minimum number of individuals needed for a population to survive

• The maximum number of individuals an environment can support

• The total number of species in an ecosystem

Which of the following is a density-dependent factor affecting population growth?

• Earthquakes

• Hurricanes

• Food availability

• Tornadoes

What is an example of a density-independent factor?

• Natural disasters

• Disease spread

• Predation

• Competition for resources

How does a high population density affect disease spread?

• It eliminates the spread of disease

• It decreases the spread of disease

• It increases the spread of disease

• It has no effect on disease spread

What happens to predator populations when prey populations decrease?

• Predator populations decrease

• Predator populations remain stable

• Predator populations increase

• Predator populations become extinct