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Unit 4 of 5

Unit 4: Organismal Biology

Study guide for CLEP CLEP Biology — Unit 4: Organismal Biology. Practice questions, key concepts, and exam tips.

64

Practice Questions

11

Flashcards

8

Key Topics

Key Concepts to Study

plant structure/function
animal organ systems
homeostasis
nervous/endocrine systems
alternation of generations (plant reproduction)
embryonic development (cleavage gastrulation neurulation)
placental development
animal behavior (innate vs learned)

Sample Practice Questions

Try these 5 questions from this unit. Sign up for full access to all 64.

Q1MEDIUM

A student is designing an experiment to investigate the effect of pH on plant growth. Which of the following steps should the student take to ensure a well-designed experiment?

A) Use a single plant for both the control and experimental groups to minimize resources
B) Only test plants at extreme pH levels to maximize the effect
C) Use a control group with a constant pH level and an experimental group with a variable pH level
D) Measure the effect of pH on plant growth by changing the pH level every hour
E) Test multiple plants at the same pH level to ensure accurate results
Show Answer

Answer: C — A well-designed experiment includes a control group for comparison to the experimental group.

Q2MEDIUM

What is the term for the type of learning in which a behavior is associated with a stimulus through repeated pairings?

A) Sensitization
B) Habituation
C) Operant conditioning
D) Imprinting
E) Classical conditioning
Show Answer

Answer: E — Classical conditioning is correct because classical conditioning involves association of a behavior with a stimulus, unlike operant conditioning which involves reinforcement.

Q3MEDIUM

What type of conditioning involves the association of a stimulus with a response, resulting in a learned behavior?

A) Classical conditioning
B) Sensitization
C) Habituation
D) Imprinting
E) Operant conditioning
Show Answer

Answer: A — Classical conditioning is correct because classical conditioning involves stimulus-response association, while operant conditioning involves reward/punishment.

Q4MEDIUM

A desert-dwelling plant has a unique response to high temperatures, where it closes its stomata during the day and opens them at night to conserve water. This response is an example of a physiological mechanism that helps the plant cope with its environment. What is the primary purpose of this mechanism?

A) To attract pollinators at night
B) To enhance root growth during daytime
C) To increase photosynthesis during the day
D) To reduce water loss through transpiration
E) To increase transpiration and cool the plant
Show Answer

Answer: D — The plant's response is an adaptation to conserve water in a hot, dry environment.

Q5MEDIUM

What is the term for the process by which animals maintain a stable internal environment despite changes in the external environment?

A) Homeostasis
B) Metabolism
C) Photosynthesis
D) Respiration
E) Transpiration
Show Answer

Answer: A — Homeostasis is correct because homeostasis is the process of maintaining a stable internal environment, not metabolism.

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Study Tips for Unit 4: Organismal Biology

  • Focus on understanding concepts, not memorizing facts — CLEP tests application
  • Practice with timed questions to build exam-day speed
  • Review explanations for wrong answers — they reveal common misconceptions
  • Use flashcards for key terms, practice questions for deeper understanding

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