Unit 2A Review

A relationship between two species where one benefits while the other is harmed.

• Mutualism
• Commensalism
• Parasitism
• Naturalism

A frog eats a fly. The frog and fly are demonstrating ________.

• mutualism
• competition
• predator/prey
• parasitism

A relationship between two organisms in which one organism benefits and the other is unharmed

• Mutualism 
• Competition
• Parasitsm 
• Commensalism 

The crocodile and bird have a _______________ relationship.  The crocodile benefits by having its teeth cleaned.  The bird benefits by gaining food and protection.  Both animals benefit from this relationship.

• parasitism
• predator and prey
• mutualism
• commensalism

Name the species interaction: A decorator crab camouflages itself with sponges. Sponges are unaffected. 

• competition 
• predation
• commensalism
• mutualism 

Evidence shows that some grasses actually benefit from being grazed. Cows eat the older, dying, and dead leaves, and new leaves are able to sprout and grow taller. Which of the following terms would best describe this plant-herbivore interaction?

• Mutualism
• Commensalism
• Parasitism
• Competition

They may be able to live in only one type of habitat, tolerate only a narrow range of climatic and other environmental conditions, or use only one type or a few types of food.

• generalist species

• specialist species

Hermit crabs live in shells made and then abandoned by snails. This relationship neither helps nor harms the snails. Which interaction is this?

• Parasitism

• Mutualism

• Commensalism

• Competition

Hummingbirds feed on nectar from flowers. The flowers are pollinated by hummingbirds as they move from flower to flower. This is an example of

• commensalism

• mutualism

• parasitism

• predation

 The stork uses it saw-like bill to cut up the dead animals it eats. As a result, the dead animal carcass is accessible to some bees for food and egg laying. The relationship neither harms nor benefits the stork.

• parasitism
• commensalism
• mutualism