Hon Bio-Ch 37-Ecosystem Ecology

Which of the following would qualify as an "ecosystem"?

• a group of prairie dogs

• a group of prairie dogs and a group of trees

• a group of prairie dogs, a group of trees, and soil

• a single prairie dog

In this food chain the falcon would be classified as a

• primary producer

• secondary producer

• primary consumer

• secondary consumer

• tertiary consumer

If the grass starts out with 10,000 J of energy...how much of the original energy is available to the snake in this food chain?

• 1,000 J

• 100 J

• 10 J

• 1 J

• 0.1 J

Decomposers and detritivores are important to ecosystems because

• they increase soil quality for plants

• they prevent dead organic matter from accumulating

• both of these are true

Which of the following is an example of an abiotic factor on a biotic factor?

• death of trees causes soil erosion

• a drought causes a herd of sheep to migrate to another area

• a wolf population hunts a rabbit population

• a fire results in better soil quality

A hummingbird receives a nectar food reward and the plant benefits by having its genetic material carried to another flower to increase genetic diversity through sexual reproduction. What type of relationship is this?

• mutualism

• commensalism

• predator-prey

• parasitoid

Which of the following is a density-independent limiting factor?

• disease

• predation

• a hurricane

• lack of food

Which abiotic factors have the greatest role in determining the amount of life an ecosystem can support?

• temperature and precipitation

• soil pH and producers

• predator and prey

• these are all abiotic factors that would have an equal role

In this food web...which of these would be the LEAST impacted if mangoes went extinct?

• rat

• fruit fly

• thrush

• dragonfly

• frog

In this foodweb interspecific competition occurs between

• dolphins and otters for pollock

• eel grass for bacteria and little schools of fish

• dolphins and seals for herring

• ocra for dolphins and seals