Ecology Review

The branch of biology that deals with the environment and the interactions of organisms in it is

• an ecosystem

• ecology

• natural history

• a niche

Abiotic factors in the environment are all

• easily measured

• living

• nonliving

• the same as dead things

A group of populations that interact in an area is

• a community

• a population

• a biome

• an ecosystem

Lions, birds, snakes and trees are all

• biotic factors

• part of a niche

• in the same food chain

• abiotic factors

Grass --> grasshopper --> mockingbird --> represents

• a food web

• a food pyramid

• a food chain

• an ecosystem

Energy in an ecosystem is used for growth or lost as

• biomass

• death

• light

• heat

Algae, grasses and trees are all

• pyramids

• consumers

• producers

• decomposers

Which chemical cycle uses bacteria to fix gases from the air?

• water

• nitrogen

• carbon

• phosphorus

A trophic level represents a

• feeding level

• chemical cycle

• pyramid

• consumer

If one organism is closely associated with and survives at the expense of another, a ___________ relationship exists.

• commensalistic

• mutualistic

• parasitic

• herbivore