1. Which is a major assumption of the BD model of population change? a. Populations always grow. b. Populations are limited by a fixed carrying capacity. c. Once an organism has acquired a unit of some resource, this resource can be used for only one function at a time. d. Individuals do not move into or out of the population. e. Population growth is density dependent. 2. Although most herbivory involves an antagonistic interaction (i.e., one species benefits, the other is harmed), some herbivorous interactions do not. Which example is least likely to be an antagonistic interaction? a. Aphids pierce stems and consume plant sap, but they do not damage other plant parts. b. Nematodes feed on the starches in plant roots; the roots live but their growth is slowed. c. Bears eat blueberries; then they defecate the blueberry seeds throughout the forest, and the seeds germinate. d. Gypsy moth caterpillars feed on the leaves of oak and aspen, defoliating and stressing the trees. e. Leaf miner insects feed on sugars in leaf cells without killing the leaves. 3. Which factor would most likely limit the size of a population? a. An increase in the population growth rate as density increases b. A decrease in the population growth rate as density increases c. A decrease in mortality as density increases d. Multiplicative growth e. Additive growth 4. Which process is most responsible for the biochemical diversity of plants, including those that produce compounds that humans use for spices? a. Adaptations to different soils b. Adaptations to different temperature regimes c. Adaptations to different levels of moisture d. Evolutionary arms races with herbivores e. Evolutionary arms races with commensals.

1. 1. Which is a major assumption of the BD model of population change? a. Populations always
grow. b. Populations are limited by a fixed carrying capacity. c. Once an organism has acquired a
unit of some resource, this resource can be used for only one function at a time. d. Individuals do
not move into or out of the population. e. Population growth is density dependent. 2. Although
most herbivory involves an antagonistic interaction (i.e., one species benefits, the other is
harmed), some herbivorous interactions do not. Which example is least likely to be an antagonistic
interaction? a. Aphids pierce stems and consume plant sap, but they do not damage other plant
parts. b. Nematodes feed on the starches in plant roots; the roots live but their growth is slowed. c.
Bears eat blueberries; then they defecate the blueberry seeds throughout the forest, and the
seeds germinate. d. Gypsy moth caterpillars feed on the leaves of oak and aspen, defoliating and
stressing the trees. e. Leaf miner insects feed on sugars in leaf cells without killing the leaves. 3.
Which factor would most likely limit the size of a population? a. An increase in the population
growth rate as density increases b. A decrease in the population growth rate as density increases
c. A decrease in mortality as density increases d. Multiplicative growth e. Additive growth 4. Which
process is most responsible for the biochemical diversity of plants, including those that produce
compounds that humans use for spices? a. Adaptations to different soils b. Adaptations to different
temperature regimes c. Adaptations to different levels of moisture d. Evolutionary arms races with
herbivores e. Evolutionary arms races with commensals