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Vocabulary
Trophic Levels
Real Populations
Limiting Factors
Miscellaneous
100
Define what a "individual" is.
One single organism.
100
How much energy does NOT get transferred between one trophic level to the next?
90% of the energy is NOT transferred from one trophic level to the next.
100
True or False: Populations are always changing.
True, populations are always increasing and decreasing.
100

What type of liming factor is weather?

Weather is an density independent limiting factor.

100
Which is greater: the amount of bacteria in your stomach, or the amount of people on the Earth?
There is more bacteria in your stomach than there is humans on this Earth.
200
Birds, flowers, trees and wolves are an example of an ecosystem. True or False?
False! An ecosystem has to have both abiotic AND biotic factors.
200
When a predator population's food supply gets larger...it A: the predator population gets larger B: the predator population dies C: the predator population gets smaller D: the predator population uses adaptations
A: the predator population gets larger
200

Janet and Timothy are trying to figure out how many bunnies they are going to have in one year from now. Right now they have 2 bunnies (one male and one female). They can have 4 babies every 6 months. How many bunnies will there be in one year from now.

10 total bunnies

200

If a population's needs are not met, then what could happen?

The population may get smaller.

200

Organisms compete for what three things?

1. Food 2. Mates 3. Territory

300
What is population?
A group of similar organisms that share the same area.
300
What is the difference between a population and a community?
A population is made up of one kind of living thing. A community is made up of different kinds of living things.
300

A population of mice lives in a barn community. A cat population has just joined the community. What will happen?

Mouse population goes down and cat population goes up

300

Define density dependent.

Density dependent depends on how many organisms are present.

300

What kind of growth do invasive species typically first exhibit?

Exponential

400

The range or area occupied by a population is its...

geographic range

400
Typically the number of organisms_______ as you go up through the food web
Decrease
400
Three factors can affect population size:
The number of births, the number of deaths and the number of individuals that leave or enter the population
400

In an ecosystem, birds depend on insects to survive. If someone spreads pesticide to control the insect population, which of the following is most likely to happen?

The bird population will decrease.

400
What is the formula for population change?
Population change = (birth + immigration)-(death + emigration