PRAXIS 5005 Science: A+ Graded End Term Exam
Aligned with ETS Standards
An object will sink in a liquid if its density is greater than that of the liquid, and it will float if its density is
less than or equal to that of the liquid. The observation that the same object sank in the freshwater but
floated in the salt water is best accounted for by concluding that the salt water is denser than both the
object and the freshwater.
Which of the following elements are most abundant in the Sun?
A.Hydrogen and helium
B.Oxygen and carbon
C.Nitrogen and phosphorus
D.Uranium and plutonium - ✔✔A.Hydrogen and helium
The composition of the Sun is approximately 99.9% hydrogen and helium.
In plants, the chlorophyll used in photosynthesis is contained in which of the following cell structures?
A.The cell wall
B.The nucleus
C.The mitochondria
D.The chloroplasts - ✔✔D.The chloroplasts
Plants are eukaryotes that have membrane-bound organelles. The chloroplast is the organelle in plant
cells that contains chlorophyll and is the site where photosynthesis occurs.
Which of the following is true about the formation of a covalent bond?
A.A covalent bond forms when electrons are shared between two atoms.
,B.A covalent bond forms when one atom donates protons to another atom.
C.A covalent bond forms when two negatively charged atoms become attached to each other.
D.A covalent bond forms when the neutrons of one atom fuse with the neutrons of another atom. -
✔✔A.A covalent bond forms when electrons are shared between two atoms.
A covalent bond involves the sharing of one or more pairs of electrons between two atoms.
Which of the following demonstrations provides the best opportunity for students to gain an
understanding of why the Sun appears larger than other stars, even though many stars are actually
larger than the Sun?
A.Positioning two lit bulbs of the same size on opposite sides of an observer but at the same distance
from the observer
B.Positioning two lit bulbs of the same size at different distances from an observer
C.Positioning a large lit bulb and a small lit bulb at the same distance from an observer
D.Positioning a large lit bulb close to an observer and a small lit bulb far from the same observer -
✔✔B.Positioning two lit bulbs of the same size at different distances from an observer
The bulb positioned closer to the observer will appear larger than the bulb positioned farther away,
even though the two bulbs are the same size. Similarly, of two stars that have approximately the same
size and temperature, the star that is closer to Earth will appear to be the larger star.
Bread molds belong to which of the following groups of organisms?
A.Bacteria
B.Animalia
C.Plantae
D.Fungi - ✔✔D.Fungi
The molds that grow on bread belong to the kingdom Fungi.
, A teacher rubs an inflated balloon with a wool cloth and then holds the balloon over bits of paper that
are lying on a table. The students in the class watch as the bits of paper rise from the table toward the
balloon. Which of the following hypotheses is best supported by the observed interaction between the
balloon and the bits of paper?
A.The balloon contains helium.
B.The balloon is unaffected by gravity.
C.The balloon has an electrostatic charge.
D.The balloon weighs more than the bits of paper do. - ✔✔C.The balloon has an electrostatic charge.
The attraction of the bits of paper to the balloon is best explained by the hypothesis that the balloon has
an electrostatic charge. Rubbing the balloon with a wool cloth transferred electrons from the wool to
the balloon, resulting in an electrostatic charge on the balloon's surface. Holding the charged balloon
over the bits of paper induced a rearrangement of charges within the paper, resulting in positively
charged areas in the bits of paper that caused them to be attracted to the negatively charged balloon.
Two black mice have a litter that contains some black offspring and some brown offspring. In mice, black
fur is dominant to brown fur. Which of the following best explains the presence of the brown offspring?
A.One parent was homozygous for black fur (BB), and one was heterozygous for black fur (Bb).
B.Both parents were heterozygous for black fur (Bb).
C.Both parents were homozygous for brown fur (bb).
D.Both parents were homozygous for black fur (BB). - ✔✔B.Both parents were heterozygous for black
fur (Bb).
Both parents must have been heterozygous for black fur (Bb) because the brown offspring (bb) must
have inherited a recessive allele (b) from each parent.
Which of the following factors best accounts for the seasonal changes in weather conditions that occur
at a particular location on Earth?
A.The Moon's gravitational pull
Aligned with ETS Standards
An object will sink in a liquid if its density is greater than that of the liquid, and it will float if its density is
less than or equal to that of the liquid. The observation that the same object sank in the freshwater but
floated in the salt water is best accounted for by concluding that the salt water is denser than both the
object and the freshwater.
Which of the following elements are most abundant in the Sun?
A.Hydrogen and helium
B.Oxygen and carbon
C.Nitrogen and phosphorus
D.Uranium and plutonium - ✔✔A.Hydrogen and helium
The composition of the Sun is approximately 99.9% hydrogen and helium.
In plants, the chlorophyll used in photosynthesis is contained in which of the following cell structures?
A.The cell wall
B.The nucleus
C.The mitochondria
D.The chloroplasts - ✔✔D.The chloroplasts
Plants are eukaryotes that have membrane-bound organelles. The chloroplast is the organelle in plant
cells that contains chlorophyll and is the site where photosynthesis occurs.
Which of the following is true about the formation of a covalent bond?
A.A covalent bond forms when electrons are shared between two atoms.
,B.A covalent bond forms when one atom donates protons to another atom.
C.A covalent bond forms when two negatively charged atoms become attached to each other.
D.A covalent bond forms when the neutrons of one atom fuse with the neutrons of another atom. -
✔✔A.A covalent bond forms when electrons are shared between two atoms.
A covalent bond involves the sharing of one or more pairs of electrons between two atoms.
Which of the following demonstrations provides the best opportunity for students to gain an
understanding of why the Sun appears larger than other stars, even though many stars are actually
larger than the Sun?
A.Positioning two lit bulbs of the same size on opposite sides of an observer but at the same distance
from the observer
B.Positioning two lit bulbs of the same size at different distances from an observer
C.Positioning a large lit bulb and a small lit bulb at the same distance from an observer
D.Positioning a large lit bulb close to an observer and a small lit bulb far from the same observer -
✔✔B.Positioning two lit bulbs of the same size at different distances from an observer
The bulb positioned closer to the observer will appear larger than the bulb positioned farther away,
even though the two bulbs are the same size. Similarly, of two stars that have approximately the same
size and temperature, the star that is closer to Earth will appear to be the larger star.
Bread molds belong to which of the following groups of organisms?
A.Bacteria
B.Animalia
C.Plantae
D.Fungi - ✔✔D.Fungi
The molds that grow on bread belong to the kingdom Fungi.
, A teacher rubs an inflated balloon with a wool cloth and then holds the balloon over bits of paper that
are lying on a table. The students in the class watch as the bits of paper rise from the table toward the
balloon. Which of the following hypotheses is best supported by the observed interaction between the
balloon and the bits of paper?
A.The balloon contains helium.
B.The balloon is unaffected by gravity.
C.The balloon has an electrostatic charge.
D.The balloon weighs more than the bits of paper do. - ✔✔C.The balloon has an electrostatic charge.
The attraction of the bits of paper to the balloon is best explained by the hypothesis that the balloon has
an electrostatic charge. Rubbing the balloon with a wool cloth transferred electrons from the wool to
the balloon, resulting in an electrostatic charge on the balloon's surface. Holding the charged balloon
over the bits of paper induced a rearrangement of charges within the paper, resulting in positively
charged areas in the bits of paper that caused them to be attracted to the negatively charged balloon.
Two black mice have a litter that contains some black offspring and some brown offspring. In mice, black
fur is dominant to brown fur. Which of the following best explains the presence of the brown offspring?
A.One parent was homozygous for black fur (BB), and one was heterozygous for black fur (Bb).
B.Both parents were heterozygous for black fur (Bb).
C.Both parents were homozygous for brown fur (bb).
D.Both parents were homozygous for black fur (BB). - ✔✔B.Both parents were heterozygous for black
fur (Bb).
Both parents must have been heterozygous for black fur (Bb) because the brown offspring (bb) must
have inherited a recessive allele (b) from each parent.
Which of the following factors best accounts for the seasonal changes in weather conditions that occur
at a particular location on Earth?
A.The Moon's gravitational pull
