Interactions in Ecosystems

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

• habitat

• niche

• social structure

• ecosystem

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

• Habitat

• Population

• Biome

• Niche

The idea that no two species within an ecosystem can occupy the exact same niche

• niche overlap

• niche differentiation

• competitive exclusion

• niche decay

Cattle egrets forage (feed) in fields among cattle. The egret gets easy access to flying insects stirred up by the cattle, and the cattle don't care if they are there or not.

• mutualism

• commensalism

• competition

• parasitism

Hummingbirds feed on nectar from flowers. The flowers are pollinated by hummingbirds as they move from flower to flower. What type of symbiosis does this demonstrate?

• commensalism

• mutualism

• parasitism

• predation

Which symbols best describe parasitism?

• +,+
• +,-
• +,0
• -,0

Mosquitos bite humans and suck out blood, which they use as food. The human may become sick from the bite. Which symbiosis is this?

• mutualism

• parasitism

• commensalism

• predation

The remora, also known as suckerfish, share a relationship with nearby sharks. Remoras have suckers attached to their fins. They attach to the bodies of sharks. The shark provides transportation for the remora. The remora feeds on scraps of food that are left behind. Which symbiosis is this?

• mutualism

• parasitism

• commensalism

• predation

In southern Asia, a mongoose and hornbill bird protect each other. They take turns guarding each other from predators while the other one sleeps. What kind of symbiosis is this?

• mutualism

• parasitism

• commensalism

• predation

All members of one species in a certain area.

• Population
• Limiting Factors
• Immigration
• Birth Rate