AP Biology Unit 8 Practice Test: Ecology

Topic 8.1 · Concept check

Some plants flower only when the night is longer than a critical length. What is this response called?

Topic 8.2 · Data analysis

Producers in an ecosystem capture 10,000 kcal of energy. About how much energy is available to tertiary consumers, the fourth trophic level?

Topic 8.2 · Concept check

Plants need nitrogen to make proteins and nucleic acids, but most nitrogen on Earth is N₂ gas. How does nitrogen from the air become available to plants?

Topic 8.2 · Apply it

A mouse and a lizard have the same body mass. Why does the mouse need much more food per day?

Topic 8.3 · Data analysis

A population of 1,000 deer has a per capita birth rate of 0.04 per year and a per capita death rate of 0.01 per year. Using dN/dt = rN, how much is the population growing per year?

Topic 8.4 · Apply it

A population's growth slows as it approaches the environment's carrying capacity. Which factor most likely causes this?

Topic 8.5 · Apply it

Sea otters eat sea urchins, and sea urchins eat kelp. If sea otters are removed from a coastal ecosystem, what is the most likely result?

Topic 8.5 · Concept check

Cattle egrets follow grazing cattle and eat insects disturbed by the cattle. The cattle are neither helped nor harmed. What kind of relationship is this?

Topic 8.5 · Experiment

Which conclusion is best supported by these results?

Topic 8.6 · Apply it

Two grassland plots are hit by the same drought. Plot 1 has 4 plant species; plot 2 has 20. Which prediction is best supported by ecological evidence?

Topic 8.7 · Data analysis

Which process best explains the pattern in the table?

Topic 8.7 · Apply it

Fertiliser runoff enters a lake. Weeks later, many fish die. Which sequence best explains this?