Topic 6 Test Review

What does biodiversity refer to?

• The variety of living organisms
• The genetic differences among organisms
• The communities and ecosystems in which organisms occure
• All of these

How is an ecosystem's biodiversity a measure of it's health?

• Biodiversity does not relate to health of an ecosystem
• The smaller the biodiversity in an ecosystem, the better the health of the ecosystem
• The greater the biodiversity of an ecosystem, the better the health of the ecosystem
• The greater the biodiversity of an ecosystem, the worse the health of the ecosystem

Wolves were reintroduced to Yellowstone National Park in 1995. This keystone species restored the park's ecosystem. What is the ecological value of a keystone species?

• They influence the survival of many other species in an ecosystem
• They prevent the ecosystem from changing and growing
• They protect land and water resources within the ecosystem
• They decrease the number of unwanted species in an ecosystem

The Starling and the buffalo have a relationship. Starlings eat ticks from the buffalo's skin, providing them with a food source while removing parasites from the buffalo. What type of relationship does this represent?

• Commensalism
• Mutualism
• Parasitism
• Predator-Prey

The frogs benefit by using the leaves of the vermiliad as shelter from sun and rain. The vermiliad are not harmed or helped by the presence of the frogs. What type of relationship do they have?

• Commensalism
• Parasitism
• Mutualism
• Predator-Prey

Mosquitos live off of the blood of humans. They leave the humans with itchy red spots. What type of relationship do they have?

• Commensalism
• Mutualism
• Parasitism
• Predator-Prey

In some grassland ecosystems, lions are predators that eat zebras. In several ecosystems, fish lice are parasites that eat the blood of fish. How are these two relationships of predation and parasitism from different ecosystems similar?

• Only one organism in each relationship dies
• Both organisms in each relationship are harmed
• Only one organsm in each relationship benefits
• neither organism in each relationship is harmed

Lichens in a forest ecosystem are actually fungi and algae living together. The fungi benefit from food produced by the algae. The algae benefit from nutrients and water absorbed by the fungi. Which of the following relationships in different ecosystems is most similar to the interaction of the fungi and algae?

• mutualism between fungi and ants
• parasitism between fungi and humans
• commensalism between birds and trees
• competition between algae and aquatic plants

Cheetahs are endangered, predatory mammals that live in sub-Saharan Africa. Which of the following are reasons that animals become endangered? Choose the three that apply.

• too much biodiversity
• low genetic diversity
• loss of habitat
• abundant resources
• environmental changes

What is the primary purpose of wildlife crossings?

• To provide scenic routes for animals
• To minimize habitat destruction
• To prevent animal-vehicle collisions
• To encourage human-animal interaction