Homeostasis Unit Midpoint Review

What happens to the amount of pesticide as you go up the food chain? (Hint: look at the ppm)

• It increases

• It fluctuates

• It remains the same

• It decreases

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Energy Pyramids

Pyramid of Numbers

The amount of pesticide in each trophic level increases as it moves up the food chain. Using your prior knowledge, how is that different from the amount of energy available at each trophic level?

• The amount of energy remains the same at each trophic level

• The amount of energy increases as you go up the pyramid

• The amount of energy decreases as you go up the pyramid

• The amount of energy fluctuates at each trophic level

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Energy Pyramids

Why would the carrying capacity of bald eagles living in the Great Lakes and Pacific Northwest be greater than eagles living in the Rocky Mountain Region?

• The Great Lakes and Pacific Northwest have a higher concentration of DDT pesticides.

• The Rocky Mountain Region has more fish-eating birds

• The Rocky Mountain Region has a higher concentration of DDT pesticides.

• The Great Lakes and Pacific Northwest have more suitable nesting sites for eagles and available resources.

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Carrying Capacity

Name a biotic feature that would impact the carrying capacity of a population:

• Soil composition

• Water pH

• Temperature

• Predator population

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Biotic vs Abiotic

Name an abiotic feature that would impact the carrying capacity of a population:

• Predator population

• Temperature

• Competition for resources

• Availability of prey

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Biotic vs Abiotic

What is the carrying capacity of Species 5 from the graph?

• 2,000

• 100

• 2,500

• 1,000

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Carrying Capacity

This figure plots the breeding populations of rabbits as they recovered from uncontrolled hunting. Based on this graph, IF EACH RABBIT NEST ACCOUNTED FOR A BREEDING PAIR, what is the probable carrying capacity of this environment?

• 160

• 75

• 50

• 100

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Carrying Capacity

What impact does increased CO₂ have on sea life shells?

• It caused an increase in the shell quality.

• It had no impact on shell quality.

• It caused a fluctuation in the shell quality.

• It caused a decrease in the shell quality.

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Ocean Acidification

Oxybenzone, a common active ingredient in sunscreens, is known to damage coral reefs. Some countries and US states have banned swimmers from using sunscreens that contain it.

How does your evidence from the graph support the claim that making oxybenzone illegal has helped the coral population?

• The number of Coral increased after oxybenzone was made illegal.

• The number of Coral decreased after oxybenzone was made illegal.

• The number of Coral remained the same after oxybenzone was made illegal.

• The number of Coral fluctuated after oxybenzone was made illegal.

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Carrying Capacity

Ocean Acidification

What was the selective pressure on the population of bacteria?

• Population size

• Resistance to antibiotics

• Antibiotic concentration

• Predator population

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Selective Pressure

Natural Selection