Unit 4 of 5
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
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Which of the following is an example of photoperiodicity?
Plant growth in response to touch
Flowering in response to day length
Root growth in response to gravity
Stem growth in response to water
Leaf movement in response to temperature
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.
What type of conditioning involves the association of a stimulus with a response, resulting in a learned behavior?
Sensitization
Habituation
Imprinting
Operant conditioning
Classical conditioning
Answer: E — Classical conditioning is correct because classical conditioning involves stimulus-response association, while operant conditioning involves reward/punishment.
What is the term for the response of plants to the direction of gravity?
Phototropism
Thigmotropism
Chemotropism
Hydrotropism
Geotropism
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.
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?
To attract pollinators at night
To enhance root growth during daytime
To increase photosynthesis during the day
To reduce water loss through transpiration
To increase transpiration and cool the plant
Answer: D — The plant's response is an adaptation to conserve water in a hot, dry environment.
Which of the following is a key difference between stereotyped and learned behaviors?
Stereotyped behaviors are more complex
Learned behaviors require more energy
Learned behaviors are only exhibited by mammals
Stereotyped behaviors are innate, while learned behaviors are acquired
Stereotyped behaviors are exhibited by all animals
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.
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