7th Grade

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7th Grade Life Science Review Questions
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1. The diagram shows an energy pyramid for a
marshland ecosystem. According to the diagram,
the greatest loss of energy takes place
between A. producers and first-order
consumers. B. first-order and second-order
consumers. C. first-order and third-order
consumers. D. second-order and third-order
consumers.
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2. Which experiment is BEST to determine if
temperature affects the growth of ivy plants? A.
Keep one ivy plant in a dark refrigerator and
another on a windowsill near a heater. B. Put one
ivy plant in a shady window and another in a
sunny window. C. Keep two ivy plants side by
side, but water one with cold water and the other
with warm water. D. Put one ivy plant in a cool
place and another in a warm place, but give both
the same amount of light and water.
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3. The graph below shows the relative rates of
action of a specific enzyme at different
temperatures.
As the temperature increases from 30C to 50C,
the rate of action of this enzyme A. remains the
same. B. increases only. C. decreases only. D.
increases, then decreases.
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4. According to the graph, as light intensity
increases, the rate of photosynthesis A. remains
constant. B. increases continuously. C. increases
and then levels off. D. increases and then
decreases.
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5. Which quotation is an example of a scientist
making an observation? A. I think jellyfish
will move toward the ocean surface at night. B.
Four of the five jellyfish moved toward the
ocean surface at night. C. Do jellyfish move
toward the ocean surface at night? D. The data
support my idea that jellyfish move toward the
ocean surface at night.
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6. Dan and Rose want to find out whether the
fifteen-year-old boys in their school are taller,
on the average, than the fifteen-year-old girls.
The school nurse has the following
information about each student. Which information
would NOT be useful for answering their
question? A. name of student B. date and year of
birth C. height of student D. sex of student
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7. About how many bacteria colonies were MOST
LIKELY in the culture after 96 hours? A. 18 B.
20 C. 24 D. 32
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8. Which is MOST important to do in an
experiment? A. make sure measurements can be
made quickly B. control all important
variables C. use new equipment D. have at least
two persons working together
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9. If you accidentally break glassware during
lab, you should A. tell your teacher. B. clean
it up, then tell your teacher. C. just clean it
up very well, and throw it in a trash
container. D. leave it for the janitor to clean
up.
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10. Which unit is the BEST to use when measuring
the size of a bacteria cell? A. micrometer
(0.000001 m) B. millimeter (0.001 m) C.
centimeter (0.01 m) D. kilometer (1,000 m)
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11. This graduated cylinder is used to
measure A. volume. B. mass. C. grams. D. meters.
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12. Which unit should you use to measure one dose
of cough syrup? A. kilograms B. centimeters C.
meters D. milliliters
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13. Which scientific development was made
possible by the invention of the light microscope
in the seventeenth century? A. study of the cell
as the basic unit of plant and animal
structure B. discovery of all nine planets in the
solar system C. study of atoms as the basic units
of elements and compounds D. discovery of radio
waves for the transmission of voice across
long distances
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14. Which is the correct sequence of organization
from LEAST complex to MOST complex? A. organism,
system, organ, tissue, cell B. organism, organ,
tissue, system, cell C. cell, tissue, organ,
system, organism D. organism, cell, tissue,
organ, system
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15. The cells of two multicelled organisms are
analyzed. The results are shown in the table
below.
Based on this information, it can be concluded
that A. Organism A is an animal and Organism B
is a plant. B. Organisms A and B are both
plants. C. Organism A is a plant and Organism B
is an animal. D. Organisms A and B are both
animals.
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16. Which BEST describes a reason why nonvascular
plants, such as mosses, grow close to the
ground? A. They do not require much sunlight. B.
They lack true roots and stems. C. They grow in
cooler temperatures. D. They do not produce seeds.
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17. A group of cells looks like this under a
microscope.
These cells all work together to do the same
thing. A group of cells like this is called A.
an organ. B. an organism. C. a tissue. D. a
system.
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18. Why are antibiotics, which kill bacteria, NOT
used to treat the flu or the common cold? A.
Antibiotics are not strong enough. B. Flu and
colds are caused by viruses. C. Doctors cannot
give powerful drugs for simple diseases. D. Flu
and cold germs have become resistant to
antibiotics.
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19. One way to slow bacterial growth in some
foods is to A. pasteurize the food. B. increase
the foods moisture content. C. warm the food to
room temperature. D. expose the food to air.
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20. Today, noninfectious disease is the leading
cause of death. A century ago the leading cause
of death was infectious disease. This change is
largely a result of A. the popularity of
nutritious foods and exercise. B. the
introduction of vitamin and mineral pills. C.
improved sanitation and the use of
antibiotics. D. better training for doctors and
nurses.
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21. Which is the basic unit of heredity? A.
gene B. chromosome C. mitochondria D. nucleus
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22. Each person receives genes from his/her
father and mother. Each of those parents received
genes from his/her own parents. What percentage
of a persons genes comes from each
grandparent? A. 10 B. 25 C. 50 D. 75
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23. If a brown guinea pig with the genes Rr mates
with a white guinea pig with the genes rr, what
are the possible gene combinations of
the offspring? A. RR and rr B. Rr and rr C. RR
and Rr D. rr only
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24. A female cat had her tail cut off in an
accident. A few months later, she had eight
kittens. How many of the kittens probably had
tails? A. 0 B. 2 C. 4 D. 8
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25. Which is the smallest of the classification
groups? A. class B. family C. kingdom D. species
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26. The Punnett square shows the result of a
cross between two parents. Which represents the
genotypes of the two parents? A. FF and FF B. Ff
and Ff C. FF and ff D. Ff and ff
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27. A girl found the skull of an animal. She did
not know what the animal was, but she was sure
that it preyed on other animals for its food.
What clue probably led to this conclusion? A.
The eye sockets faced sideways. B. The skull was
much longer than it was wide. C. Four of the
teeth were long and pointed. D. The jaw could
move sideways as well as up and down.
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28. Which drawing represents a type of bacteria?
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29. Which is the most direct source of energy
used by the mushroom? A. It uses sunlight to
make energy. B. It uses energy made by plants
growing nearby. C. It uses energy from decayed
matter in the soil. D. It uses energy from the
stored food in its seed.
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30. Today, almost no one gets polio because A.
doctors have found new drugs that cure polio when
it happens. B. contaminated water, which used to
cause polio, has been cleaned up. C. people are
given a vaccine that keeps them from getting
polio. D. people eat better food and get more
exercise, so they are healthier.
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31. Which organs and tissues make up the
circulatory system? A. brain, spinal cord, and
nerves B. liver, stomach, and esophagus C. heart,
arteries, and veins D. lungs, trachea, and nose
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32. Which BEST explains why marine algae are most
often found in the top 100 meters of the
ocean? A. Marine algae can live only where there
is light for photosynthesis. B. Marine algae have
no roots to anchor them to the ocean floor. C.
The pressure is too great for marine algae to
survive below 100 meters. D. The temperature of
the top 100 meters of the ocean is ideal for
marine algae.
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33. The offspring of a plant that reproduces
asexually will A. share all of the parents
characteristics. B. be incapable of producing
flowers. C. fail to grow and develop normally. D.
develop fruit even if the parent did not.
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34. Sharks and rays differ from other fish
primarily because they A. are warm-blooded. B.
have skeletons made of cartilage. C. do not
breathe through gills. D. have fins on their
backs.
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35. Animals get energy from the food they eat.
What is the original source of this energy? A.
the soil B. the water cycle C. the Sun D.
fertilizer
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36. Which characteristic do all of these
organisms share? A. They are consumers. B. They
are predators. C. They are producers. D. They are
vertebrates.
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37. If all green plants died, what would be the
most important effect on humans? A. They would
survive by eating meat only. B. They would all
eventually die. C. Humans would only get sick
without vitamins from plants. D. Humans would
evolve into a new species.
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38. Which two biomes have very limited
precipitation? A. coniferous forest and
grassland B. desert and taiga C. temperate forest
and prairie D. tundra and desert
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39. In ecosystems, the Suns energy is
transferred through food webs, as shown below.
In the food web, the Suns energy is MOST
directly available to people through A. path
A. B. path B. C. path C. D. path D.
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40. If you started at the North Pole and traveled
south, which is the first biome you would
find? A. desert B. temperate (deciduous)
forest C. tropical rain forest D. tundra
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41. Which are the two MOST important factors that
determine the climate in any biome of the
world? A. temperature and precipitation B.
prevailing wind and precipitation C. mountain
ranges and temperature D. prevailing wind and
mountain ranges
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42. Mary Anns class was planning a weeklong
camping trip. Her teacher said the area is high
in the Rocky Mountains, where snow is common.
Conifers such as spruce and hemlock are abundant
around the camp. Animals they might see include
elk, bighorn sheep, moose, and grizzly bears. In
which biome is this camp located? A. tundra B.
taiga C. grassland D. desert
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43. A pesticide was sprayed at time x and again
at time y. The graph above shows that some of the
pests survived after being sprayed at time
x. Which statement BEST explains the information
shown in the graph? A. Offspring of the
survivors were all killed by the pesticide. B.
Offspring of the survivors were not affected by
the pesticide. C. Offspring of the survivors were
better able to survive the pesticide. D. The
survivors were unable to produce viable offspring.
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44. Sometimes two organisms of different species
are adapted to living together for the mutual
benefit of both. This is demonstrated by a fungus
and an alga living together to form a lichen.
This association is a type of A. parasitism. B.
symbiosis. C. protective adaptation. D.
camouflage.
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45. Whale ancestors were land animals that moved
to the sea long ago. The fossil record shows
that, over many generations, the nostrils moved
back to where the whale blowhole is now. Why is
this adaptation an advantage for the whale? A.
It helps the whale smell things better in the
water. B. It prevents water from going into
the lungs. C. Having the blowhole on top reduces
drag as the whale swims. D. The whale does not
have to lift its head out of the water to breathe.