Ecology Review

Decomposer organisms break down dead organisms, providing energy to carnivores

• true

• false

What is composed of several food chains in an ecosystem that intersect and depend on one another?

• niche

• feeding level

• energy pyramid

• food web

Which organisms can be found at the first, or lowest, trophic level?

• herbivores

• carnivores

• heterotrophs

• autotrophs

Weather (such as rain) and soil conditions are considered to be part of the ____________ factors of an ecosystem.

• biotic

• antibiotic

• abiotic

• biomass

Which of these phrases describes the biotic factors of an ecosystem?

• the number of individual organisms in each trophic level of an ecosystem

• any living part of an environment

• an organism that eats only meat

What is the carrying capacity of the graph?

• around 500

• more than 800

• less than 300

• around 700

Which of the following would INCREASE the carrying capacity of an ecosystem?

• increase in predators
• disease
• increase in available food
• drought

Match the following

• Parasitism

• 
• Predation

• 
• Commensalism

• 
• Symbiosis

• 

2 factors which increase population size

• Birth Rate, Immigration
• Death Rate, Immigration
• Birth Rate, Emigration
• Death Rate, Emigration

Excessive amounts of rain caused a flood in the southwest United States that resulted in substantial amounts of deaths in the rabbit population? This situation is an example of a density _____________ limiting factor.

• density-independent
• density-dependent
• density- too high
• density- too low