| Populations |
| #1 |
What is the definition of a population? |
A group of individuals of the same species living in the same area |
| #2 |
What are the factors that control population size? |
Birth rate, death rate, immigration, emigration |
| #3 |
What happens when the birth rate is equal to death rate? |
The population won't increase. |
| #4 |
List three characteristics of a population. |
geographic distribution, density, growth rate. |
| #5 |
What is population density? |
Number of individuals in a certain area |
| Age Pyramids |
| #1 |
A population that is increasing in size is shaped like a ..... |
triangle |
| #2 |
A population that is smaller at the bottom than the top is.... |
decreasing in size |
| #3 |
What factors increase the likelihood of a stable population? |
death rate is equal to birth rate; good healthcare, job opportunities, stable economy, plentiful food supply |
| #4 |
How could a country with a increasing population change their population to a stable population size? |
Increase opportunities for education, stabilize food supply, improve healthcare |
| #5 |
What technological advancements have contributed to long life expectancies? |
Vaccines, antibioitics, improved sanitation, improved surgical procedures |
| Ecological Interactions |
| #1 |
What is a prey? |
An organism that eat is eaten by another organism; could be a plant or animal |
| #2 |
What is a niche? |
The role an organism has in its habitat. |
| #3 |
What is the relationship between a niche and competition? |
No two species can survive in the same niche at the same time in the same place |
| #4 |
How does competition control population size? |
In competition, only one species survives; the other species must emigrate or die, decreasing the population size |
| #5 |
What is a parasite? |
A parasite is an organism that benefits from a symbiotic relationship while the other organism is injured by the association. |
| Limiting Factors |
| #1 |
List the factors that limit population size. |
Predation, Competition, Parasites, Disease |
| #2 |
Explain how limiting factors affect population size. |
LImiting factors prevent populations from growing because the prevent individuals from moving in and reproducing successfully |
| #3 |
What does density independence mean? |
Density independence is when a limiting factor affects a population regardless of population density. |
| #4 |
What does density dependence mean? |
Density dependence depends on the number of indviduals present in a population; as population increases in density, effects are greater |
| #5 |
Two species of bacteria are grown together in a petri dish. One reproduces more than the other. What factor is likely limiting growth, and is it density independent or density dependent? |
Competition is density dependent. |
| Population Growth Curves |
| #1 |
Name the two types of growth curves. |
Logisitic and Exponential growth curves. |
| #2 |
What is carrying capacity and in which type of growth curve is it seen in? |
Carrying capacity is the number of individuals a population can sustainably support in an environment. Logisitic. |
| #3 |
What happens to a population that exceeds carrying capacity? |
The population decreases due to starvation, disease, or some other density dependent factor |
| #4 |
Why does a population experience exponential growth? |
Populations can experience exponential growth because it is not limited by any factors. |
| #5 |
Why is the human population currently experiencing exponential growth? |
The human population is experiencing exponential growth as humans have technological advancements that have allowed them to exceed their natural carrying capacity. |
