Unit 3 Study Guide

What are three factors that affect population growth?

-birth rate (how fast you're making babies) -immigration (organisms moving into geographic range) -emigration (organisms exiting range)

VA#1 Name two predators in this food chain. also state each each predators prey

2 predators: Hawk/Snake Wolf/Deer

VA#1 The picture to the left shows a food web arranged into trophic levels. How many energy-transferring steps away from the sun is the deer? What is the name of an organism that primarily eats producers?

2 steps away from the sun is the deer. Organisms that primarily eat producers are rabbits.

How are biotic and abiotic factors different? What characters of life are associated with the interactions of these factors? why?

B factors are living organisms and a factors are non living components of an ecosystem. response to environment is a characteristic of life, because bears hibernate bc it's too cold to get food

Under what conditions does a population experience exponential growth? What would happen to the same population if the environment suddenly changed?

Ideal conditions with unlimited resources, the growth rate would slow down then level out.

VA#1 What is a keystone species? In the picture to the left, which organism might be a keystone species in this ecosystem? What do you predict would happen to the ecosystem of this organism were removed?

KS: aren't high in abundance and they have a huge impact on their ecosystem. If this organism was removed, the prey would starve and the predators would decline. A KS in this organism is a flowering shrub

VA#2 from figure 5-5, which species has the greater growth rate overall where in the species are grown together? Describe the growth curve of P caudatum in graph 3

P auruelia, p cau. quickly increases in 4 days. after 4 days it slowly decreases

VA#1 Which population in the picture on the left would be the most directly affected I'm the farmer in the area decided not to plant corn? What other animals would be affected?

The mouse would be affected the most. The snake and the hawk would also be affected

Describe how deforestation might contribute to climate change.

There wouldn't be as much oxygen in the air and there is less absorption in the air

How do predators affect the population of of their prey through time? Sketch a graph demonstrating your explanation.

as the population of the prey increases, there is more food for the predators, so the population of the predators increase. If the predators decrease, the prey will increase. *graph: x axis time y axis pop size.

list three abiotic and biotic factors that determine the survival of a rabbit in a temperature forest

b: -snake -wolf -hawk a: -weather -water -nutrients

VA#2 are the limiting factors for both cultures in figure 5-5 density dependent factors or density independent factors? what is the difference? give one example of each type of limiting factor.

density dependent factors. density dependent factors effects stress from overcrowding. ex: competition over food, shelter, mates, etc. density independent factors affect all populations. ex: natural disasters such as hurricanes, tital waves, etc

explain how ecology can guide us to a sustainable future?

ecologists recognize the problems, research the cause and suggest the solution

VA#1 In the picture to the left, would the wolf obtain a greater percentage of the Suns energy if it ate a deer or if it ate a shrew? explain your answer

if it ate a deer bc it's closer to the shn

explain what would happen if two mouse species try to occupy the same niche in the same meadow

if they tried to occupy the same niche then they would either divide resources, or one of the mice would die and the other would use all of the resources (the second reason happens bc of c.e.p.)

VA#2 What type of population growth curve can be observed in graphs one and two of figure 5-5? explain each of the three associated with this type of growth curve

legistic growth 3 stages: - pop growth rapidly - slow down - leveling out

VA#2 according to figure 5-5, which species has the greatest growth rate over days one and two when they are grown in separate cultures? Which species has the highest growth rate over one and two days when they are grown together?

p caudatum & p caudatum

Explain the roles of photosynthesis and cellular respiration in the carbon cycle

photosynthesis takes co2 out of the atmosphere and cellular respiration puts it back in the atmosphere.

explain how plant productivity affects the carbon cycle

the higher the plant productivity, the less CO2 there is in the atmosphere

VA#2 What is most likely the reason why the population of p cau. decreased in graph 3 of figure 5-5?

the p auralia probably killed them off