Practice Test

The ecological role an organism performs in their specific environment is considered the organism's...

• Habitat

• Population

• Biome

• Niche

A relationship between two species in which both species compete for limited resources...

• Symbiosis

• interspecific competition

• species richness

• species-area effect

When put together, one organism outcompetes the other for resources.  This is an example of:

• competitive exclusion principle
• speciation
• biological niche
• evolution

An organism's _________ is defined as the environment in which it lives.

• habitat
• niche
• social structure
• ecosystem

Keystone species are top predators who control the food chain through...

• "top down regulation"

• "bottom up regulation"

• "horizontal regulation"

• "vertical regulation" 

An extensive drought in the plains threatens wildebeest, giraffe, zebra, and buffalo populations.

• Density-Dependent

• Density-Independent

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

• pollution

• unusual weather

• competition

• natural disaster

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

• climate extremes

• predation
• disease
• competition

Which habitat exhibits the greatest biodiversity?

• A habitat with 15 different species with about 300 individuals each
• A habitat with 10 different species with about 75 individuals each
• A habitat with 4 different species with about 150 individuals each
• A habitat with only one species with about 2000 individual

What is the MOST likely consequence if we converted the grass to cropland in this WOODLAND ECOSYSTEM?

• Only the rabbits would be affected, because they are the ones who eat the grass.
• The blueberry bush would begin to grow wild, because it would have more space to grow.
• Nothing would happen; the animals would eat something else.
• The ecosystem would most likely be disrupted, because the grass is one of its primary producers