Unit 1: The Living World: Ecosystems

The graph shows primary productivity at different depths in Lake A. Which statement best describes and explains the pattern?

The table gives the mean temperature and precipitation in four months at Site Q. Which biome does Site Q most likely belong to?

Fungi grow on the roots of many trees. The fungi absorb water and minerals for the tree, and the tree supplies sugars to the fungi. This relationship is an example of

Three species of warbler live in the same spruce trees. One feeds at the treetops, one in the middle branches and one near the trunk. What does this pattern show?

Which step of the nitrogen cycle returns nitrogen from the soil to the atmosphere?

To measure productivity in a pond, a student fills two sealed bottles with pond water and algae. One bottle is clear and one is wrapped in foil so that no light enters. She measures dissolved oxygen in both after 24 hours. What is the purpose of the dark bottle?

The diagram shows part of a food web along the Pacific coast. When hunters removed sea otters from parts of the coast, what happened to the kelp, and why?

What role do decomposers and detritivores play in a food web?

The graph shows monthly carbon dioxide concentrations in one year at Station N, a site in the Northern Hemisphere. Which best explains the fall from May to September?

A neighborhood floods after heavy rain because water runs off roofs and streets. Which solution would best increase the water that soaks into the ground?

Which law of thermodynamics best explains why energy is lost at each step of a food chain?

Phosphorus washing off farm fields is causing algal blooms in a lake. Which solution would most directly reduce the phosphorus reaching the lake?