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BIO 103 Exam 1 Actual Test Bank 2026/2027
Verified Answers and Complete Solutions with
Detailed Rationales Grade A
1. A scientist proposes that "plants that are watered excessively will have a higher
rate of photosynthesis than those that are watered just regularly." This statement is
an example of:
A. A fact
B. A theory
C. A hypothesis
D. A law
Correct Answer: C. A hypothesis
Rationale: A hypothesis is an educated guess about the reason for a phenomenon that
can be tested. This statement proposes a testable relationship between watering
frequency and photosynthesis rate.
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2. The statement "chlorophyll absorbs blue and red wavelengths of light to perform
photosynthesis" is an example of:
A. A fact
B. A theory
C. A hypothesis
D. A law
Correct Answer: B. A theory
Rationale: A theory is a broad explanation of natural phenomena based on many
observations. This statement provides a comprehensive explanation supported by
substantial evidence.
3. The observation that "leaves of plants are green" is an example of:
A. A fact
B. A theory
C. A hypothesis
D. A law
Correct Answer: A. A fact
Rationale: A fact is an observation of a phenomenon in nature. The statement that
leaves are green is a direct observation.
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4. A scientist states, "when the pressure on a sample of a dry gas is held constant, its
temperature and volume will be in direct proportion." This statement is an example
of:
A. A fact
B. A theory
C. A hypothesis
D. A law
Correct Answer: D. A law
Rationale: A law is a general statement about natural phenomena based on
observations describing how variables are related. This statement describes a consistent
relationship between temperature and volume.
5. In an experiment where ferns grow well when planted in the shade, the
independent variable is:
A. The amount of plant growth
B. The type of fern used
C. How much sun or shade the plant receives
D. The soil type
BIO 103 Exam 1 Actual Test Bank 2026/2027
Verified Answers and Complete Solutions with
Detailed Rationales Grade A
1. A scientist proposes that "plants that are watered excessively will have a higher
rate of photosynthesis than those that are watered just regularly." This statement is
an example of:
A. A fact
B. A theory
C. A hypothesis
D. A law
Correct Answer: C. A hypothesis
Rationale: A hypothesis is an educated guess about the reason for a phenomenon that
can be tested. This statement proposes a testable relationship between watering
frequency and photosynthesis rate.
,2|Page
2. The statement "chlorophyll absorbs blue and red wavelengths of light to perform
photosynthesis" is an example of:
A. A fact
B. A theory
C. A hypothesis
D. A law
Correct Answer: B. A theory
Rationale: A theory is a broad explanation of natural phenomena based on many
observations. This statement provides a comprehensive explanation supported by
substantial evidence.
3. The observation that "leaves of plants are green" is an example of:
A. A fact
B. A theory
C. A hypothesis
D. A law
Correct Answer: A. A fact
Rationale: A fact is an observation of a phenomenon in nature. The statement that
leaves are green is a direct observation.
, 3|Page
4. A scientist states, "when the pressure on a sample of a dry gas is held constant, its
temperature and volume will be in direct proportion." This statement is an example
of:
A. A fact
B. A theory
C. A hypothesis
D. A law
Correct Answer: D. A law
Rationale: A law is a general statement about natural phenomena based on
observations describing how variables are related. This statement describes a consistent
relationship between temperature and volume.
5. In an experiment where ferns grow well when planted in the shade, the
independent variable is:
A. The amount of plant growth
B. The type of fern used
C. How much sun or shade the plant receives
D. The soil type
