Chapter 20 Review

The best example of a population in the list below is the

• people living in the Town of Wetaskiwin, Alberta.

• tiger salamander tadpoles in 2006.

• invertebrates in Elk Island National Park in June 2005.

• Canadian darner dragonflies in Kerry Wood Nature Reserve on June 21, 2005.

A community is best defined as all of the

• living things found in a specific habitat.

• animals living in a locality at a certain time.

• individuals of a species in its entire range.

• plants that define a climax community.

Todd Fuller and Lloyd Keith, researchers with the University of Wisconsin, monitored wolves on the 25 000 km² Alberta Oil Sands Environmental Research Program (AOSERP) area near Fort McMurray during 1976-1977. Radio-telemetry data from four packs, a trapper survey, and incidental observations were combined to estimate a population of 166 wolves. The low density reflected the slowly declining moose population of 180/1000 km².

Calculate the population density (D_P) of wolves in this study.

• 166 wolves/km²

• 180 wolves/ km²

• 6.6 x 10^–3 wolves/km²

• 7.2 x 10^–3 wolves/km²

In order to identify the symbiotic relationships that have co-evolved between individuals of different species, a scientist should

• determine which species feeds on the other species.

• ensure that the species are found in the same community.

• establish which species gains and which species loses in the community.

• determine the trophic levels of each species.

The “r” in r-selected populations refers to

• the biotic potential of the population.

• the rapid growth of this type of population.

• the carrying capacity of the population.

• the symbiotic relationship in which one partner benefits and the other is harmed.

Theoretically, in predator-prey interactions, the predator population

• tends to remain lower than the prey population.

• tends to reach peaks that are higher than those of the prey population.

• decreases before the population of prey decreases.

• remains relatively constant since predators are r-selected.

Which of the following best compares a predator-prey interaction to a herbivore-producer interaction?

• In both interactions, one individual benefits while the other individual loses.

• In both interactions, both of the individuals involved benefit.

• In both interactions, both of the individuals involved are harmed.

• In both interactions, a plant species and an animal species is involved.

Identify the different phases of yeast growth in the graph.

a

b

c

f

exponential growth

logistic growth

carrying capacity

lag Phase

stable equilibrium

death phase

The combined effects of various interacting limiting factors is represented by the number ​ (a)   on this diagram and is termed ​ (b)   .

• 1
• 2
• 3
• 4
• environmental resistance
• carrying capacity

The six-spotted ladybird beetle is orange and black and tastes terrible to birds. The monarch butterfly is also orange and black and is usually toxic to birds. The six-spotted ladybird beetle and the monarch butterfly both utilize this defense mechanism known as

• Batesian mimicry.

• protective colouration.

• Müllerian mimicry.

• cryptic colouration.