AP Environmental Science Practice Quiz: Dose Response Curve
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Test your understanding with short quizzes. This quiz has 7 questions to check your progress.
Question 1 of 7
All Questions (7)
A) The rate at which a toxin biodegrades in an ecosystem.
B) The effect on an organism or mortality rate based on the dose of a substance.
C) The genetic variation within a population exposed to a drug.
D) The time it takes for an organism to develop immunity to a toxin.
Correct Answer: B
The provided content explicitly states that a dose response curve 'describes the effect on an organism or mortality rate in a population based on the dose of a particular toxin or drug.'
A) The mortality rate or percentage of organisms affected.
B) The duration of the experiment.
C) The dose of the toxin or drug administered.
D) The size of the test population.
Correct Answer: C
A dose response curve plots the response (effect or mortality) as a function of the dose. Therefore, the dose is the independent variable, which is plotted on the x-axis.
A) To determine the chemical composition of the toxin.
B) To understand the relationship between the amount of exposure and the resulting effect.
C) To measure the speed at which the toxin spreads through a population.
D) To identify the original source of the toxin in the environment.
Correct Answer: B
The curve is a tool used to evaluate the link between the dose of a substance and the effect it produces, which is the fundamental relationship being studied.
A) The toxin is only effective in a very narrow range of concentrations.
B) A small increase in the dose leads to a large increase in the mortality rate.
C) The entire population has a uniform, high tolerance to the toxin.
D) The toxin has a very long half-life in the organism.
Correct Answer: B
The slope of the curve represents the change in response for a given change in dose. A steep slope indicates that even a minor change in the dose causes a significant change in the effect (e.g., mortality).
A) The total number of organisms that survived the experiment.
B) The specific effect (e.g., mortality rate) observed at a specific dose.
C) The average time it took for the toxin to show an effect.
D) The maximum possible dose that can be administered.
Correct Answer: B
Each point on the curve is a coordinate (x, y) that corresponds to a specific dose (x-value) and the measured response or effect at that dose (y-value).
A) Drug B is more potent than Drug A.
B) A lower dose of Drug A is required to produce the same effect as a higher dose of Drug B.
C) Both drugs have the same level of toxicity at all doses.
D) Drug A is safer for the organism than Drug B.
Correct Answer: B
A shift to the left on a dose response curve indicates greater potency. This means that a smaller amount (dose) of the substance is needed to elicit the same level of response, making Drug A more potent than Drug B.
A) The weight of the individual organisms.
B) The cost of the toxin per gram.
C) The percentage of a population showing an effect or mortality.
D) The ambient temperature during the experiment.
Correct Answer: C
The content specifies that a dose response curve describes the 'effect on an organism or mortality rate in a population.' This rate is typically quantified as a percentage of the population that is affected.