Which of the four major biogeochemical cycles are significantly affected by human activities?
- None of them
- carbon only
- Water only
- All of them (water, carbon, nitrogen, and phosphorus)
- Nitrogen and phosphorus only
Herbivores are animals that eat living plants. Therefore they are:
- tertiary consumers (level 4)
- primary consumers (level 2)
- secondary consumers (level 3)
- producers (level 1)
In the diagram below, which organism is a tertiary consumer and is on trophic level 4?
A food chain shows the following sequence: eagles eat wolves; wolves eat rabbits; rabbits eat grass; grass is fueled by sunlight. This food chain is probably…
- Simplistic and incomplete, showing only a few of many possible links among these and many other species in the ecosystem.
- True and complete, showing all the known feeding relationships in the ecosystem.
Choose the abiotic component below.
- tree roots
- green leaf plant
- ocean water
Which of the following consumers should be most abundant and most able to obtain an adequate food supply from a small area of habitat?
- A primary consumer (level 2) such as a rabbit.
- A tertiary consumer (level 4) such as a fox-eating eagle.
- A secondary consumer (level 3) such as a rabbit-eating fox.
Adult largemouth bass eat smaller fish. These smaller fish eat a variety of foods. They eat some producers (algae) directly. They eat some zooplankton that are primary consumers. They also eat some predatory insects that are secondary consumers. Which option best describes the trophic level(s) of largemouth bass?
- They are on trophic levels 3–5
- They are on trophic level 2
- They are on trophic level 1
- They are on trophic levels 2–4
- They are on trophic level 5
Which of the following are involved in biogeochemical cycles?
- Living producers
- Living consumers
- Decomposers and detritivores
- Land, air, and water
- All of the above
Which statement accurately describes one role of producers?
- Producers capture heat energy and use it to produce sugar.
- Producers obtain all the energy they need for growth and reproduction from the gases in the air and nutrients in the soil.
- Producers consume dead organic matter and release the nutrients to make them available for other organisms.
- Producers are responsible for converting light energy into chemical energy that can then be used by consumers.
When does the cycling of a carbon atom end?
- It doesn’t; the same carbon atoms are continually recycled in the Earth’s ecosystems.
- When it escapes the atmosphere and drifts off into space.
- When it is converted to another element by heat and pressure.
- When it is consumed by fire.