Human Population and Resource Unit Test Review

The largest population an environment can support based on available resources is its _______________________.

• carrying capacity

• limiting factor

• population

• symbiosis

In which type of symbiosis do both organisms benefit from the relationship?

• Parasitism

• Mutualism

• Commensalism

• Predation

A bird that sits on a horse’s back and eats the insects that bite the horse demonstrates:

• Mutualism

• Parasitism

• Competition

• Commensalism

Two members of the same species fight over who gets a certain food. Members of different species try to take over a certain nesting area. These are both examples of:

• Community

• Competition

• Mutualism

• Commensalism

Barnacles create home sites by attaching themselves to whales. This neither harms nor benefits the whales. This is an example of

• Mutualism

• Parasitism

• Commensalism

• Predation

As loggers cut down more trees within a forest, there are fewer places for birds to build their nests. What is this an example of?

• A predator attacking its prey.

• A food web increasing in size.

• A mutualistic symbiotic relationship.

• The forest’s carrying capacity decreasing.

Certain bacteria live in the intestines of humans. Humans cannot completely digest all of the food that we eat. The bacteria eat and help break down and digest the food that we cannot digest.  This is:

• Predation

• Mutualism

• Parasitism

• Commensalism

The lamprey is a large invertebrate that attaches itself to other fish. The lamprey scrapes a hole in the fish's skin and sucks the blood out, killing the fish. This is:

• Commensalism

• Mutualism

• Parasitism

• Decomposition

Ostriches and gazelles feed next to each other. They both watch for predators. Because the visual abilities of the two species are different, they can alert each other of threats that the other may not see as readily. This is:

• Mutualism

• Commensalism

• Parasitism

• Predation

How does population growth affect resource availability?

• The more people on the planet, the less natural resources that are available for each person.

• The less people on the planet, the less natural resources that are available for each person.

• The more people on the planet, the more natural resources that are available for each person.

• All are true except B.