POB Final Newest Actual Exam With Complete Questions And Correct Detailed
Answers (Verified Answers) |Already Graded A+
Question 1
An increase in fitness—the survival of more offspring—that occurs due to competition among
males and mate choice by females is called:
A) Artificial selection
B) Natural selection
C) Genetic drift
D) Sexual selection
E) Stabilizing selection
Correct Answer: D) sexual selection
Rationale: Sexual selection is a specific form of natural selection where certain individuals
possess traits that make them more likely to secure mates. This often involves intrasexual
competition (males competing with each other) and intersexual selection (females choosing
specific males based on desirable traits or displays). It directly impacts fitness by increasing
the number of offspring an individual produces.
Question 2
In a study of garter snake populations, inland and coastal eggs were hatched in a lab. When
presented with slug-slime-covered swabs, coastal snakes attacked them while inland snakes did
not. Which of the following statements is true regarding this behavior?
A) The behavior was learned from the mother after hatching.
B) The behavior was genetic; organisms were born either recognizing slugs as food or not.
C) The behavior was shaped by the abiotic components of the lab environment.
D) The behavior was a result of operant conditioning during the experiment.
E) The behavior was an altruistic act toward the researchers.
Correct Answer: B) The behavior was genetic. Organisms were born either recognizing slugs
as food or not.
Rationale: Because the snakes were hatched in a controlled lab environment without
exposure to their natural parents or slugs, their immediate response to the slug slime
indicates an innate, genetically programmed behavior. This demonstrates that food
preference in these populations is an inherited trait rather than a learned one.
Question 3
By definition, a biological ecosystem contains:
A) Only the living organisms in a specific area.
B) Only the abiotic components, such as weather and soil chemistry.
C) Both the living organisms and the abiotic components of the environment.
D) Only the animals within a food web.
E) The geological features of the earth without biological influence.
, 2
Correct Answer: C) both the living organisms and the abiotic components of the
environment.
Rationale: An ecosystem is a level of biological organization that encompasses all the biotic
(living) factors, such as plants, animals, and microbes, and how they interact with the
abiotic (non-living) factors, such as sunlight, temperature, water, and soil minerals.
Question 4
Which of the following is considered a primary strength of the scientific method?
A) Science relies on the authority of famous scientists to establish truth.
B) Science is self-correcting because new data may require altered theories.
C) Science deals only with subjective truths that cannot be measured.
D) Science is a static body of knowledge that never changes.
E) Science is based on intuition rather than empirical testing.
Correct Answer: B) Science is self-correcting since new data and new technologies may
require new or altered theories. This constant testing make science durable
Rationale: One of the greatest strengths of science is its antiauthoritarian and self-
correcting nature. Scientific theories are constantly subjected to testing; if new evidence or
technology proves an old idea wrong, the theory is updated or replaced. This ensures that
scientific knowledge remains accurate and reliable over time.
Question 5
In a study where 20 rice fields are divided—10 receiving nitrogen fertilizer and 10 receiving
phosphate fertilizer—to measure crop yield, the type of fertilizer used represents the:
A) Dependent variable
B) Control group
C) Independent/experimental variable
D) Replicate
E) Constant
Correct Answer: C) The type of fertilizer used.
Rationale: The independent variable is the factor that is deliberately manipulated by the
researcher to determine its effect on the outcome. In this experiment, the researcher is
changing the type of fertilizer (Nitrogen vs. Phosphate) to see how it influences the yield
(the dependent variable).
Question 6
When two species attempt to use the same limited environmental resources and have overlapping
niches, the resulting interaction is:
A) Mutualism
B) Commensalism
C) Competition
, 3
D) Parasitism
E) Altruism
Correct Answer: C) Competition
Rationale: Competition occurs when the niches of two species overlap, meaning they require
the same resources (food, water, space) that are in limited supply. This interaction typically
has a negative effect on both parties as they expend energy to secure those resources.
Question 7
A form of symbiosis in which one participant benefits and the other is neither benefited nor
harmed is known as:
A) Mutualism
B) Parasitism
C) Competition
) Commensalism
E) Predation
Correct Answer: D) commensalism
Rationale: Commensalism is a unique symbiotic relationship where one organism (the
commensal) gains a benefit, such as transportation or shelter, while the host organism
remains unaffected. An example is cattle egrets eating insects stirred up by grazing
livestock.
Question 8
During the process of dehydration synthesis between two monomers:
A) A water molecule is added to break a bond.
B) One monomer loses a hydrogen atom and the other loses a hydroxyl group, forming water.
C) Two oxygen atoms are shared to create a double bond.
D) Electrons are transferred from a metal to a non-metal.
E) A carbon atom is removed from the chain to release energy.
Correct Answer: B) one monomer loses a hydrogen atom, and the other loses a hydroxyl
group, forming water.
Rationale: Dehydration synthesis is the chemical reaction used to bond monomers into
polymers. By removing a hydrogen (-H) from one monomer and a hydroxyl (-OH) from
another, a molecule of water (H2O) is produced as a byproduct, and a new covalent bond is
formed between the monomers.
Question 9
Isotopes of a specific element are defined by having:
A) The same number of neutrons but different numbers of protons.
B) The same number of protons but a different number of neutrons.
, 4
C) A different number of electrons in the outer shell.
D) The same atomic mass but different atomic numbers.
E) Only a different number of valence electrons.
Correct Answer: B) the same number of protons but differ in the number of neutrons.
Rationale: The identity of an element is determined by its proton count (atomic number).
Isotopes are variants of that element that have the same number of protons but differ in the
number of neutrons, resulting in different atomic masses. Some isotopes are unstable and
radioactive.
Question 10
Fatty acids that contain one or more double bonds between the carbon atoms in their chain are
classified as:
A) Saturated
B) Hydrogenated
C) Unsaturated
D) Polysaccharides
E) Inorganic
Correct Answer: C) unsaturated
Rationale: Unsaturated fatty acids have double bonds in their carbon skeleton, which
creates "kinks" in the chain and prevents the molecules from packing tightly together. This
is why unsaturated fats (like vegetable oils) are typically liquid at room temperature.
Question 11
Which of the following is NOT a form of environmental resistance?
A) Limited food supply
B) Accumulation of toxic waste
C) Predation
D) Number of offspring produced per litter
E) Spread of infectious disease
Correct Answer: D) number of offspring produced per litter
Rationale: Environmental resistance refers to all the limiting factors (biotic and abiotic) that
prevent a population from reaching its biotic potential. Food shortages and disease are
external pressures. The "number of offspring per litter" is an intrinsic factor of the species'
biotic potential, not a form of resistance from the environment.
Question 12
Human activities significantly impact the phosphorus cycle. Which of the following are human
inputs into this cycle?
A) Photosynthesis and Respiration
Answers (Verified Answers) |Already Graded A+
Question 1
An increase in fitness—the survival of more offspring—that occurs due to competition among
males and mate choice by females is called:
A) Artificial selection
B) Natural selection
C) Genetic drift
D) Sexual selection
E) Stabilizing selection
Correct Answer: D) sexual selection
Rationale: Sexual selection is a specific form of natural selection where certain individuals
possess traits that make them more likely to secure mates. This often involves intrasexual
competition (males competing with each other) and intersexual selection (females choosing
specific males based on desirable traits or displays). It directly impacts fitness by increasing
the number of offspring an individual produces.
Question 2
In a study of garter snake populations, inland and coastal eggs were hatched in a lab. When
presented with slug-slime-covered swabs, coastal snakes attacked them while inland snakes did
not. Which of the following statements is true regarding this behavior?
A) The behavior was learned from the mother after hatching.
B) The behavior was genetic; organisms were born either recognizing slugs as food or not.
C) The behavior was shaped by the abiotic components of the lab environment.
D) The behavior was a result of operant conditioning during the experiment.
E) The behavior was an altruistic act toward the researchers.
Correct Answer: B) The behavior was genetic. Organisms were born either recognizing slugs
as food or not.
Rationale: Because the snakes were hatched in a controlled lab environment without
exposure to their natural parents or slugs, their immediate response to the slug slime
indicates an innate, genetically programmed behavior. This demonstrates that food
preference in these populations is an inherited trait rather than a learned one.
Question 3
By definition, a biological ecosystem contains:
A) Only the living organisms in a specific area.
B) Only the abiotic components, such as weather and soil chemistry.
C) Both the living organisms and the abiotic components of the environment.
D) Only the animals within a food web.
E) The geological features of the earth without biological influence.
, 2
Correct Answer: C) both the living organisms and the abiotic components of the
environment.
Rationale: An ecosystem is a level of biological organization that encompasses all the biotic
(living) factors, such as plants, animals, and microbes, and how they interact with the
abiotic (non-living) factors, such as sunlight, temperature, water, and soil minerals.
Question 4
Which of the following is considered a primary strength of the scientific method?
A) Science relies on the authority of famous scientists to establish truth.
B) Science is self-correcting because new data may require altered theories.
C) Science deals only with subjective truths that cannot be measured.
D) Science is a static body of knowledge that never changes.
E) Science is based on intuition rather than empirical testing.
Correct Answer: B) Science is self-correcting since new data and new technologies may
require new or altered theories. This constant testing make science durable
Rationale: One of the greatest strengths of science is its antiauthoritarian and self-
correcting nature. Scientific theories are constantly subjected to testing; if new evidence or
technology proves an old idea wrong, the theory is updated or replaced. This ensures that
scientific knowledge remains accurate and reliable over time.
Question 5
In a study where 20 rice fields are divided—10 receiving nitrogen fertilizer and 10 receiving
phosphate fertilizer—to measure crop yield, the type of fertilizer used represents the:
A) Dependent variable
B) Control group
C) Independent/experimental variable
D) Replicate
E) Constant
Correct Answer: C) The type of fertilizer used.
Rationale: The independent variable is the factor that is deliberately manipulated by the
researcher to determine its effect on the outcome. In this experiment, the researcher is
changing the type of fertilizer (Nitrogen vs. Phosphate) to see how it influences the yield
(the dependent variable).
Question 6
When two species attempt to use the same limited environmental resources and have overlapping
niches, the resulting interaction is:
A) Mutualism
B) Commensalism
C) Competition
, 3
D) Parasitism
E) Altruism
Correct Answer: C) Competition
Rationale: Competition occurs when the niches of two species overlap, meaning they require
the same resources (food, water, space) that are in limited supply. This interaction typically
has a negative effect on both parties as they expend energy to secure those resources.
Question 7
A form of symbiosis in which one participant benefits and the other is neither benefited nor
harmed is known as:
A) Mutualism
B) Parasitism
C) Competition
) Commensalism
E) Predation
Correct Answer: D) commensalism
Rationale: Commensalism is a unique symbiotic relationship where one organism (the
commensal) gains a benefit, such as transportation or shelter, while the host organism
remains unaffected. An example is cattle egrets eating insects stirred up by grazing
livestock.
Question 8
During the process of dehydration synthesis between two monomers:
A) A water molecule is added to break a bond.
B) One monomer loses a hydrogen atom and the other loses a hydroxyl group, forming water.
C) Two oxygen atoms are shared to create a double bond.
D) Electrons are transferred from a metal to a non-metal.
E) A carbon atom is removed from the chain to release energy.
Correct Answer: B) one monomer loses a hydrogen atom, and the other loses a hydroxyl
group, forming water.
Rationale: Dehydration synthesis is the chemical reaction used to bond monomers into
polymers. By removing a hydrogen (-H) from one monomer and a hydroxyl (-OH) from
another, a molecule of water (H2O) is produced as a byproduct, and a new covalent bond is
formed between the monomers.
Question 9
Isotopes of a specific element are defined by having:
A) The same number of neutrons but different numbers of protons.
B) The same number of protons but a different number of neutrons.
, 4
C) A different number of electrons in the outer shell.
D) The same atomic mass but different atomic numbers.
E) Only a different number of valence electrons.
Correct Answer: B) the same number of protons but differ in the number of neutrons.
Rationale: The identity of an element is determined by its proton count (atomic number).
Isotopes are variants of that element that have the same number of protons but differ in the
number of neutrons, resulting in different atomic masses. Some isotopes are unstable and
radioactive.
Question 10
Fatty acids that contain one or more double bonds between the carbon atoms in their chain are
classified as:
A) Saturated
B) Hydrogenated
C) Unsaturated
D) Polysaccharides
E) Inorganic
Correct Answer: C) unsaturated
Rationale: Unsaturated fatty acids have double bonds in their carbon skeleton, which
creates "kinks" in the chain and prevents the molecules from packing tightly together. This
is why unsaturated fats (like vegetable oils) are typically liquid at room temperature.
Question 11
Which of the following is NOT a form of environmental resistance?
A) Limited food supply
B) Accumulation of toxic waste
C) Predation
D) Number of offspring produced per litter
E) Spread of infectious disease
Correct Answer: D) number of offspring produced per litter
Rationale: Environmental resistance refers to all the limiting factors (biotic and abiotic) that
prevent a population from reaching its biotic potential. Food shortages and disease are
external pressures. The "number of offspring per litter" is an intrinsic factor of the species'
biotic potential, not a form of resistance from the environment.
Question 12
Human activities significantly impact the phosphorus cycle. Which of the following are human
inputs into this cycle?
A) Photosynthesis and Respiration
