Test Bank for Human Biology, 17th Edition by
Sylvia Mader 350+ Multiple-Choice Questions
with Answers and Rationales
1) The scientific study of life is called
A) biology.
B) ecology.
C) anatomy.
D) biochemistry.
E) limnology.
Correct Answer: A
Rationale: Biology is the branch of science that deals with the study of living
organisms and life processes. Ecology studies interactions between organisms and
environment, anatomy studies structure, biochemistry studies chemical processes,
and limnology studies freshwater systems.
2) A complex individual that consists of organ systems is known as a(n)
A) community.
B) population.
C) organism.
D) tissue.
E) species.
Correct Answer: C
Rationale: An organism is an individual living thing that can be composed of
organ systems. A community includes multiple species, a population is a group of
the same species, tissue is a group of cells, and a species is a group of similar
organisms.
3) All of the ecosystems on the planet together are called the
A) atmosphere.
B) hydrosphere.
C) biosphere.
,D) lithosphere.
E) stratosphere.
Correct Answer: C
Rationale: The biosphere is the global sum of all ecosystems, including all living
organisms and the environments they inhabit. Atmosphere is the layer of gases,
hydrosphere is water, lithosphere is the Earth's crust, and stratosphere is an
atmospheric layer.
4) In a swamp, all of the alligators would represent a(n)
A) ecosystem.
B) community.
C) population.
D) biosphere.
E) organ system.
Correct Answer: C
Rationale: A population consists of all individuals of the same species living in a
particular area. All alligators in the swamp represent a population. An ecosystem
includes living and nonliving components, a community includes all species,
biosphere is global, and organ system is a level of biological organization within
an organism.
5) Which of the following represents the correct order of biological organization
from smallest to largest?
A) Organelle → cell → tissue → organ → organ system → organism
B) Cell → organelle → tissue → organ → organism → organ system
C) Organelle → tissue → cell → organ → organ system → organism
D) Cell → tissue → organelle → organ → organism → organ system
Correct Answer: A
Rationale: The hierarchy of biological organization begins with organelles (e.g.,
nucleus), then cells, tissues, organs, organ systems, and finally the organism.
6) Homeostasis refers to the ability of an organism to
A) maintain a stable internal environment despite external changes.
,B) reproduce sexually.
C) evolve over time.
D) respond to stimuli.
E) grow and develop.
Correct Answer: A
Rationale: Homeostasis is the maintenance of a stable internal environment, such
as body temperature, pH, and blood glucose levels, through regulatory
mechanisms.
7) Which kingdom includes multicellular, heterotrophic organisms that digest their
food externally?
A) Plantae
B) Animalia
C) Fungi
D) Protista
E) Monera
Correct Answer: C
Rationale: Fungi are multicellular (except yeasts), heterotrophic, and absorb
nutrients after external digestion using enzymes. Plantae are autotrophic, Animalia
ingest food, Protista are diverse, and Monera (bacteria) are prokaryotic.
8) Prokaryotic cells differ from eukaryotic cells because prokaryotic cells
A) have a nucleus.
B) lack membrane-bound organelles.
C) are always multicellular.
D) have cell walls.
E) contain DNA.
Correct Answer: B
Rationale: Prokaryotes (bacteria and archaea) lack a nucleus and other
membrane-bound organelles. Eukaryotes have a nucleus and organelles. Both can
have cell walls and contain DNA.
, 9) Which of the following is an example of a decomposer in an ecosystem?
A) Grass
B) Rabbit
C) Mushroom
D) Wolf
E) Algae
Correct Answer: C
Rationale: Mushrooms are fungi that break down dead organic matter, returning
nutrients to the soil. Grass and algae are producers, rabbit and wolf are
consumers.
10) The primary source of energy for most ecosystems is
A) geothermal heat.
B) the sun.
C) chemical reactions.
D) wind.
E) tides.
Correct Answer: B
Rationale: Sunlight is the main energy source for photosynthesis, which drives
most food webs. Some deep-sea ecosystems use chemical energy (chemosynthesis),
but the majority rely on the sun.
11) A hypothesis is best defined as a(n)
A) proven fact.
B) educated guess that can be tested.
C) conclusion based on observations.
D) theory that is widely accepted.
E) law of nature.
Correct Answer: B
Rationale: A hypothesis is a testable, falsifiable proposed explanation for a
phenomenon. It is not a proven fact; that comes after experimentation and
validation.
Sylvia Mader 350+ Multiple-Choice Questions
with Answers and Rationales
1) The scientific study of life is called
A) biology.
B) ecology.
C) anatomy.
D) biochemistry.
E) limnology.
Correct Answer: A
Rationale: Biology is the branch of science that deals with the study of living
organisms and life processes. Ecology studies interactions between organisms and
environment, anatomy studies structure, biochemistry studies chemical processes,
and limnology studies freshwater systems.
2) A complex individual that consists of organ systems is known as a(n)
A) community.
B) population.
C) organism.
D) tissue.
E) species.
Correct Answer: C
Rationale: An organism is an individual living thing that can be composed of
organ systems. A community includes multiple species, a population is a group of
the same species, tissue is a group of cells, and a species is a group of similar
organisms.
3) All of the ecosystems on the planet together are called the
A) atmosphere.
B) hydrosphere.
C) biosphere.
,D) lithosphere.
E) stratosphere.
Correct Answer: C
Rationale: The biosphere is the global sum of all ecosystems, including all living
organisms and the environments they inhabit. Atmosphere is the layer of gases,
hydrosphere is water, lithosphere is the Earth's crust, and stratosphere is an
atmospheric layer.
4) In a swamp, all of the alligators would represent a(n)
A) ecosystem.
B) community.
C) population.
D) biosphere.
E) organ system.
Correct Answer: C
Rationale: A population consists of all individuals of the same species living in a
particular area. All alligators in the swamp represent a population. An ecosystem
includes living and nonliving components, a community includes all species,
biosphere is global, and organ system is a level of biological organization within
an organism.
5) Which of the following represents the correct order of biological organization
from smallest to largest?
A) Organelle → cell → tissue → organ → organ system → organism
B) Cell → organelle → tissue → organ → organism → organ system
C) Organelle → tissue → cell → organ → organ system → organism
D) Cell → tissue → organelle → organ → organism → organ system
Correct Answer: A
Rationale: The hierarchy of biological organization begins with organelles (e.g.,
nucleus), then cells, tissues, organs, organ systems, and finally the organism.
6) Homeostasis refers to the ability of an organism to
A) maintain a stable internal environment despite external changes.
,B) reproduce sexually.
C) evolve over time.
D) respond to stimuli.
E) grow and develop.
Correct Answer: A
Rationale: Homeostasis is the maintenance of a stable internal environment, such
as body temperature, pH, and blood glucose levels, through regulatory
mechanisms.
7) Which kingdom includes multicellular, heterotrophic organisms that digest their
food externally?
A) Plantae
B) Animalia
C) Fungi
D) Protista
E) Monera
Correct Answer: C
Rationale: Fungi are multicellular (except yeasts), heterotrophic, and absorb
nutrients after external digestion using enzymes. Plantae are autotrophic, Animalia
ingest food, Protista are diverse, and Monera (bacteria) are prokaryotic.
8) Prokaryotic cells differ from eukaryotic cells because prokaryotic cells
A) have a nucleus.
B) lack membrane-bound organelles.
C) are always multicellular.
D) have cell walls.
E) contain DNA.
Correct Answer: B
Rationale: Prokaryotes (bacteria and archaea) lack a nucleus and other
membrane-bound organelles. Eukaryotes have a nucleus and organelles. Both can
have cell walls and contain DNA.
, 9) Which of the following is an example of a decomposer in an ecosystem?
A) Grass
B) Rabbit
C) Mushroom
D) Wolf
E) Algae
Correct Answer: C
Rationale: Mushrooms are fungi that break down dead organic matter, returning
nutrients to the soil. Grass and algae are producers, rabbit and wolf are
consumers.
10) The primary source of energy for most ecosystems is
A) geothermal heat.
B) the sun.
C) chemical reactions.
D) wind.
E) tides.
Correct Answer: B
Rationale: Sunlight is the main energy source for photosynthesis, which drives
most food webs. Some deep-sea ecosystems use chemical energy (chemosynthesis),
but the majority rely on the sun.
11) A hypothesis is best defined as a(n)
A) proven fact.
B) educated guess that can be tested.
C) conclusion based on observations.
D) theory that is widely accepted.
E) law of nature.
Correct Answer: B
Rationale: A hypothesis is a testable, falsifiable proposed explanation for a
phenomenon. It is not a proven fact; that comes after experimentation and
validation.
