PrepLion

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.

109

Practice Questions

18

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 109.

Q1MEDIUM

Which of the following is an example of photoperiodicity?

A) Plant growth in response to touch
B) Flowering in response to day length
C) Root growth in response to gravity
D) Stem growth in response to water
E) Leaf movement in response to temperature
Show Answer

Answer: B — Flowering in response to day length is correct because photoperiodicity refers to the ability of plants to measure day length and respond with physiological changes, such as flowering.

Q2EASY

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

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

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

Q3MEDIUM

What is the term for the response of plants to the direction of gravity?

A) Phototropism
B) Thigmotropism
C) Chemotropism
D) Hydrotropism
E) Geotropism
Show Answer

Answer: E — When you plant a seed in a pot and it starts growing, you might notice the roots digging deep into the soil while the stem reaches upwards. This is an example of Geotropism, where plants respond to the direction of gravity by growing their roots downwards and stems upwards. In contrast, Phototropism, which involves growth in response to light, is a different phenomenon that might cause a plant to bend towards a window. Geotropism is the correct term for this gravity-driven response, making it essential for plant development.

Q4EASY

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

Which of the following is a key difference between stereotyped and learned behaviors?

A) Stereotyped behaviors are more complex
B) Learned behaviors require more energy
C) Learned behaviors are only exhibited by mammals
D) Stereotyped behaviors are innate, while learned behaviors are acquired
E) Stereotyped behaviors are exhibited by all animals
Show Answer

Answer: D — Stereotyped behaviors are innate, while learned behaviors are acquired is correct because stereotyped behaviors are fixed, instinctual patterns of behavior that are present from birth, whereas learned behaviors are acquired through experience and learning.

Ready to master Unit 4: Organismal Biology?

Start with your full diagnostic and projected score, plus 5 free practice questions per course — no credit card required. Paid plans add unlimited practice, the full explanation on every question, AI tutoring, flashcards and a personalized study plan.

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

CLEP® is a trademark registered by the College Board, which is not affiliated with, and does not endorse, this product.