Population and Symbiosis

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

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

• commensalism
• mutualism
• parasitism
• predation

What type of symbiosis?  Skunks often live in burrows that have been dug and abandoned by woodchucks.  

• commensalism
• mutualism
• parasitism
• predation

Which symbols best describe parasitism?

• +,+
• +,-
• +,0
• -,0

Aphids are tiny insects that live on and eat the leaves of plants, removing nutrients from the plants.

• Predation

• Parasitism

• Commensalism

• Mutualism

Barnacles create home sites by attaching themselves to whales. The whales don't care if they're attached or not. 

• parasitism
• commensalism
• mutualism

Mistletoe removes water and nutrients from a spruce tree. The spruce tree is harmed. 

• parasitism
• commensalism
• mutualism

In a mutual relationship, both organisms are ________________. 

• hurt
• not effected
• harmed
• benefiting 

What happened to the Hare population after the decrease in Lynx population in 1860? (the hare population is the taller pont above the arrow)

• The decrease of lynx led to an increase in the amount of hares.

• The decrease of lynx led to a decrease in the hare population.

• The hare population stayed the same.

How did the increased population of wolves in year 5 affect the deer population in year 6?

• The increase in wolves led to a decrease in deer.

• There was no effect because the data showed that the population stayed the same.

• The increase in wolves led to an increase in deer.