AP Biology 8.1: Responses to the Environment
Practise AP Biology 8.1 questions by linking environmental cues, communication and organismal responses with fitness and population success.
- Syllabus
- Effective Fall 2025
- Course
- AP Biology
Exam points
- explain how internal or external cues trigger behavioral or physiological responses
- connect organismal communication, innate or learned behavior and cooperation with survival and reproductive success
- use experimental and behavioral data to infer stimulus-response relationships and selection effects
Covered syllabus points
8.1 Responses to the Environment question 1
[Maximum number: 6]
Many insects rely on pheromones (chemical signals) that are released by the females to find
mating partners. Scientists hypothesize that, in a certain type of moth, the behavior of male
moths in response to pheromones is regulated by the extracellular signaling molecule 20E.
Question (a)
(a)
B.
[ 4 ]
Question (i)
(i)
Using the template in the space provided for your response, construct an appropriate
type of graph that represents the data in Table 1. Your graph should be appropriately
plotted and labeled.
[ 3 ]
- Data are represented in a bar/modified bar graph.
- Data and error bars are accurately plotted.
- Graph is appropriately labeled.
Question (ii)
(ii)
Based on the data in Table 1, determine the type of activity that was affected by
inhibiting the expression of the DopEcR receptor.
[ 1 ]
- Oriented activity was affected.
Question (b)
(b)
C.
[ 1 ]
Question (i)
(i)
Based on Table 1, identify the treatment group in which the oriented activity was greater
than 50\% of the general activity.
[ 1 ]
(i) Using the template in the space provided for your response, construct an appropriate
type of graph that represents the data in Table 1. Your graph should be appropriately
plotted and labeled.
- Data are represented in a bar/modified bar graph.
- Examples of acceptable responses may include the following:
(i) Using the template in the space provided for your response, construct an appropriate
type of graph that represents the data in Table 1. Your graph should be appropriately
plotted and labeled.
- Data and error bars are accurately plotted.
(i) Using the template in the space provided for your response, construct an appropriate
type of graph that represents the data in Table 1. Your graph should be appropriately
plotted and labeled.
- Graph is appropriately labeled.
Question (c)
(c)
D.
[ 1 ]
Question (i)
(i)
Use evidence from the information provided to support the scientists' claim.
[ 1 ]
(i) Expression of the gene encoding DopEcR is low in the male moths during their first few
days as adults, when they are sexually immature. Gene expression rapidly increases as the
moths reach sexual maturity. The scientists claim that this increase in gene expression
increases the likelihood of males finding females with whom to mate. Use evidence from
the information provided to support the scientists' claim.
Examples of acceptable responses may include the following:
- (Increased expression of DopEcR) will increase oriented activity (and the moths' ability
to find a mate).
- (An increase in DopEcR expression) will make the males more sensitive to
pheromones from the females.
- (An increase in DopEcR expression) will enable the binding of 20E to more receptors
and will make the males more sensitive to pheromones from the females.
Point D1
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