LIFE-SPAN DEVELOPMENT FINAL (STRAIGHTERLINE) | 2026/2027 120 Questions | Complete Solutions
STRAIGHTERLINE COURSE EXAMINATION | COMPLETE SOLUTIONS EDITION
LIFE-SPAN DEVELOPMENT FINAL
(STRAIGHTERLINE) QUESTIONS WITH
COMPLETE SOLUTIONS 2026/2027
• Aligned with the Straighterline Life-Span Development Course Syllabus (full-course coverage)
• APA Guidelines for the Undergraduate Psychology Major: Goals 1 (Knowledge Base), 2 (Scientific Inquiry and
Critical Thinking), 3 (Ethical and Social Responsibility), 5 (Professional Development)
• Developmental Psychology Core Competencies, 2026/2027 Edition: life-span perspective, developmental theories,
research literacy, applied case analysis
Blueprint: 120 questions | 10 sections | Cognitive mix 25% recall / 50% application / 25% analysis | Style 70%
scenario-based, 30% direct knowledge | Multiple choice, 4 options (A-D), one correct answer per question with complete
rationale.
Section 1: Introduction to Life-Span Development & Research Methods
Q1: Dr. Alvarez designs a study in which she simultaneously measures infants' brain maturation,
their problem-solving skills, and the quality of their attachment to caregivers. Which core
characteristic of the life-span perspective does her approach best illustrate?
A. Development is multidirectional, consisting only of alternating gains and losses
B. Development is plastic and becomes permanently fixed after infancy
C. Development is multidimensional, involving interacting biological, cognitive, and
socioemotional dimensions [CORRECT]
D. Development is discontinuous and can only be measured in stages
Correct Answer: C
Rationale: Because Dr. Alvarez measures biological, cognitive, and socioemotional domains at the same time,
her design captures the multidimensionality emphasized in the Straighterline Life-Span Development unit on
the life-span perspective (APA Goal 1.2, major developmental frameworks). Option A describes
multidirectionality, which refers to gains and losses within a single dimension. Option B contradicts plasticity,
and Option D incorrectly attaches the stage concept to the definition of multidimensionality.
1
,LIFE-SPAN DEVELOPMENT FINAL (STRAIGHTERLINE) | 2026/2027 120 Questions | Complete Solutions
Q2: Marcus, an 80-year-old retired professor, has noticed that his processing speed has slowed,
yet his vocabulary and his capacity to give wise counsel to students continue to grow. Which
characteristic of the life-span perspective is best illustrated by his experience?
A. Development is multidirectional, combining gains in some abilities with losses in others
[CORRECT]
B. Development is unidimensional and uniform across all abilities
C. Development is largely complete by early adulthood
D. Development is primarily biological rather than cognitive or socioemotional
Correct Answer: A
Rationale: The simultaneous presence of decline (processing speed) and growth (vocabulary, wisdom) is the
textbook example of multidirectionality in the Straighterline curriculum's discussion of lifelong,
multidirectional change. Option B is wrong because abilities change unevenly across domains. Options C and
D both deny that meaningful development continues into late adulthood, which contradicts the life-span
perspective and APA Standard 1.1 on the full developmental spectrum.
Q3: In an adoption study, children separated from their biological parents at birth still resemble
their biological parents in intelligence test scores, even though the adoptive homes they were
raised in also predict higher scores. What is the most scientifically defensible conclusion?
A. Heredity exclusively determines intelligence
B. Environment exclusively determines intelligence
C. Intelligence cannot be studied scientifically
D. Heredity and environment interact to shape intelligence [CORRECT]
Correct Answer: D
Rationale: Because both biological relatedness and rearing environment independently predict scores, the
study demonstrates an interaction of nature and nurture, the central conclusion of behavioral genetics covered
in the Straighterline unit on the study of development (APA Goal 2.1, scientific inquiry). Options A and B
each capture only half of the evidence, and Option C is false because the adoption design is a legitimate
scientific method for estimating genetic and environmental contributions.
2
,LIFE-SPAN DEVELOPMENT FINAL (STRAIGHTERLINE) | 2026/2027 120 Questions | Complete Solutions
Q4: A student reviewing the psychoanalytic tradition asks how Erikson's theory differs from
Freud's. Which comparison is accurate?
A. Erikson emphasized psychosexual pleasure centers, while Freud emphasized lifelong
psychosocial tasks
B. Freud proposed eight stages across the entire lifespan, while Erikson ended development
at adolescence
C. Erikson described eight psychosocial stages spanning the entire lifespan, while Freud
proposed five psychosexual stages that end in adolescence [CORRECT]
D. The two theories are identical except for the names of the stages
Correct Answer: C
Rationale: Erikson's psychosocial theory extended development across eight stages from infancy to old age,
whereas Freud's psychosexual theory contained five stages largely resolved in childhood; this contrast is a core
Straighterline exam objective in the developmental theories module. Option A reverses the two theorists, and
Options B and D misstate both theories. APA Standard 1.2 requires distinguishing major theorists' positions
accurately.
Q5: Twenty-two-year-old Kaya has graduated from college, is still exploring career options and
romantic partners, changes apartments frequently, and describes herself as neither an adolescent
nor a fully settled adult. According to Arnett, which period of development best describes her?
A. Adolescence
B. Emerging adulthood [CORRECT]
C. Middle adulthood
D. Late adulthood
Correct Answer: B
Rationale: Arnett proposed emerging adulthood, roughly ages 18 to 25, as a distinct period marked by identity
exploration, instability, self-focus, and feeling in-between, which matches Kaya's profile as presented in the
Straighterline module on periods of development. Option A is incorrect because she has left the dependency of
adolescence. Options C and D describe later periods characterized by established roles and, in late adulthood,
considerations of legacy and mortality.
3
, LIFE-SPAN DEVELOPMENT FINAL (STRAIGHTERLINE) | 2026/2027 120 Questions | Complete Solutions
Q6: A researcher gives one memory test to 20-year-olds, 40-year-olds, and 60-year-olds on a
single day and finds that the oldest group performs worst. She later discovers that the 60-year-old
cohort grew up with less formal education than the younger groups. What is the main
interpretive problem with her cross-sectional design?
A. Participant attrition
B. Practice effects from repeated testing
C. Cohort effects confounding age differences [CORRECT]
D. Failure to obtain random assignment
Correct Answer: C
Rationale: In a cross-sectional design, groups differ in both age and the historical conditions in which they
were raised, so education-related cohort differences, not age alone, may explain the results; this limitation is
emphasized in the Straighterline research methods unit (APA Goal 2.1). Option A applies to longitudinal
designs. Option B applies to repeated-measures studies, and this test was administered once. Option D is not
the key confound because this is a nonexperimental comparison by design.
Q7: A developmental scientist follows the same 500 children every two years from age 5 to age
25. Which statement identifies the most serious practical limitation of this longitudinal design?
A. It cannot reveal patterns of change within individuals
B. It is expensive and time-consuming, and participants may drop out over the years
[CORRECT]
C. It confounds age change with cohort differences
D. It can only compare different age groups at one point in time
Correct Answer: B
Rationale: Longitudinal designs are uniquely able to track within-individual change, but they suffer from high
cost, long duration, and attrition, which can bias the surviving sample; this trade-off is a standard Straighterline
exam point on research designs. Option A is false because within-individual change is exactly what
longitudinal designs show. Option C describes the cross-sectional design, and Option D describes the
cross-sectional method as well.
4
STRAIGHTERLINE COURSE EXAMINATION | COMPLETE SOLUTIONS EDITION
LIFE-SPAN DEVELOPMENT FINAL
(STRAIGHTERLINE) QUESTIONS WITH
COMPLETE SOLUTIONS 2026/2027
• Aligned with the Straighterline Life-Span Development Course Syllabus (full-course coverage)
• APA Guidelines for the Undergraduate Psychology Major: Goals 1 (Knowledge Base), 2 (Scientific Inquiry and
Critical Thinking), 3 (Ethical and Social Responsibility), 5 (Professional Development)
• Developmental Psychology Core Competencies, 2026/2027 Edition: life-span perspective, developmental theories,
research literacy, applied case analysis
Blueprint: 120 questions | 10 sections | Cognitive mix 25% recall / 50% application / 25% analysis | Style 70%
scenario-based, 30% direct knowledge | Multiple choice, 4 options (A-D), one correct answer per question with complete
rationale.
Section 1: Introduction to Life-Span Development & Research Methods
Q1: Dr. Alvarez designs a study in which she simultaneously measures infants' brain maturation,
their problem-solving skills, and the quality of their attachment to caregivers. Which core
characteristic of the life-span perspective does her approach best illustrate?
A. Development is multidirectional, consisting only of alternating gains and losses
B. Development is plastic and becomes permanently fixed after infancy
C. Development is multidimensional, involving interacting biological, cognitive, and
socioemotional dimensions [CORRECT]
D. Development is discontinuous and can only be measured in stages
Correct Answer: C
Rationale: Because Dr. Alvarez measures biological, cognitive, and socioemotional domains at the same time,
her design captures the multidimensionality emphasized in the Straighterline Life-Span Development unit on
the life-span perspective (APA Goal 1.2, major developmental frameworks). Option A describes
multidirectionality, which refers to gains and losses within a single dimension. Option B contradicts plasticity,
and Option D incorrectly attaches the stage concept to the definition of multidimensionality.
1
,LIFE-SPAN DEVELOPMENT FINAL (STRAIGHTERLINE) | 2026/2027 120 Questions | Complete Solutions
Q2: Marcus, an 80-year-old retired professor, has noticed that his processing speed has slowed,
yet his vocabulary and his capacity to give wise counsel to students continue to grow. Which
characteristic of the life-span perspective is best illustrated by his experience?
A. Development is multidirectional, combining gains in some abilities with losses in others
[CORRECT]
B. Development is unidimensional and uniform across all abilities
C. Development is largely complete by early adulthood
D. Development is primarily biological rather than cognitive or socioemotional
Correct Answer: A
Rationale: The simultaneous presence of decline (processing speed) and growth (vocabulary, wisdom) is the
textbook example of multidirectionality in the Straighterline curriculum's discussion of lifelong,
multidirectional change. Option B is wrong because abilities change unevenly across domains. Options C and
D both deny that meaningful development continues into late adulthood, which contradicts the life-span
perspective and APA Standard 1.1 on the full developmental spectrum.
Q3: In an adoption study, children separated from their biological parents at birth still resemble
their biological parents in intelligence test scores, even though the adoptive homes they were
raised in also predict higher scores. What is the most scientifically defensible conclusion?
A. Heredity exclusively determines intelligence
B. Environment exclusively determines intelligence
C. Intelligence cannot be studied scientifically
D. Heredity and environment interact to shape intelligence [CORRECT]
Correct Answer: D
Rationale: Because both biological relatedness and rearing environment independently predict scores, the
study demonstrates an interaction of nature and nurture, the central conclusion of behavioral genetics covered
in the Straighterline unit on the study of development (APA Goal 2.1, scientific inquiry). Options A and B
each capture only half of the evidence, and Option C is false because the adoption design is a legitimate
scientific method for estimating genetic and environmental contributions.
2
,LIFE-SPAN DEVELOPMENT FINAL (STRAIGHTERLINE) | 2026/2027 120 Questions | Complete Solutions
Q4: A student reviewing the psychoanalytic tradition asks how Erikson's theory differs from
Freud's. Which comparison is accurate?
A. Erikson emphasized psychosexual pleasure centers, while Freud emphasized lifelong
psychosocial tasks
B. Freud proposed eight stages across the entire lifespan, while Erikson ended development
at adolescence
C. Erikson described eight psychosocial stages spanning the entire lifespan, while Freud
proposed five psychosexual stages that end in adolescence [CORRECT]
D. The two theories are identical except for the names of the stages
Correct Answer: C
Rationale: Erikson's psychosocial theory extended development across eight stages from infancy to old age,
whereas Freud's psychosexual theory contained five stages largely resolved in childhood; this contrast is a core
Straighterline exam objective in the developmental theories module. Option A reverses the two theorists, and
Options B and D misstate both theories. APA Standard 1.2 requires distinguishing major theorists' positions
accurately.
Q5: Twenty-two-year-old Kaya has graduated from college, is still exploring career options and
romantic partners, changes apartments frequently, and describes herself as neither an adolescent
nor a fully settled adult. According to Arnett, which period of development best describes her?
A. Adolescence
B. Emerging adulthood [CORRECT]
C. Middle adulthood
D. Late adulthood
Correct Answer: B
Rationale: Arnett proposed emerging adulthood, roughly ages 18 to 25, as a distinct period marked by identity
exploration, instability, self-focus, and feeling in-between, which matches Kaya's profile as presented in the
Straighterline module on periods of development. Option A is incorrect because she has left the dependency of
adolescence. Options C and D describe later periods characterized by established roles and, in late adulthood,
considerations of legacy and mortality.
3
, LIFE-SPAN DEVELOPMENT FINAL (STRAIGHTERLINE) | 2026/2027 120 Questions | Complete Solutions
Q6: A researcher gives one memory test to 20-year-olds, 40-year-olds, and 60-year-olds on a
single day and finds that the oldest group performs worst. She later discovers that the 60-year-old
cohort grew up with less formal education than the younger groups. What is the main
interpretive problem with her cross-sectional design?
A. Participant attrition
B. Practice effects from repeated testing
C. Cohort effects confounding age differences [CORRECT]
D. Failure to obtain random assignment
Correct Answer: C
Rationale: In a cross-sectional design, groups differ in both age and the historical conditions in which they
were raised, so education-related cohort differences, not age alone, may explain the results; this limitation is
emphasized in the Straighterline research methods unit (APA Goal 2.1). Option A applies to longitudinal
designs. Option B applies to repeated-measures studies, and this test was administered once. Option D is not
the key confound because this is a nonexperimental comparison by design.
Q7: A developmental scientist follows the same 500 children every two years from age 5 to age
25. Which statement identifies the most serious practical limitation of this longitudinal design?
A. It cannot reveal patterns of change within individuals
B. It is expensive and time-consuming, and participants may drop out over the years
[CORRECT]
C. It confounds age change with cohort differences
D. It can only compare different age groups at one point in time
Correct Answer: B
Rationale: Longitudinal designs are uniquely able to track within-individual change, but they suffer from high
cost, long duration, and attrition, which can bias the surviving sample; this trade-off is a standard Straighterline
exam point on research designs. Option A is false because within-individual change is exactly what
longitudinal designs show. Option C describes the cross-sectional design, and Option D describes the
cross-sectional method as well.
4
