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Worksheets7th Grade Science Review
Total questions: 84
Worksheet time: 1hrs 9mins
Name
Class
Date
1.
Which of the following is the smallest unit of life that can carry out all life functions?
a)
the mitochondria
b)
the vacuoles
c)
the nucleus
d)
the cell
2.
Which structures are found in every living cell?
a)
cell membrane and cytoplasm
b)
chloroplasts and mitochondria
c)
a cell wall and nucleus
d)
chloroplasts and cell wall
3.
Which cell structure is found in plant and animals cells and controls what can come into or leave a cell?
a)
cell membrane
b)
cytoplasm
c)
nucleus
d)
vacuole
4.
What is the function of the cell nucleus found in both plant and animal cells?
a)
to produce energy
b)
to control cell activity
c)
to remove waste products
d)
to allow molecules to enter the cell
5.
What is one basic function of the vacuoles?
a)
circulating oxygen
b)
producing food
c)
controlling cell processes
d)
storing water
6.
Chloroplasts in plant cells allow the plant to perform a function that animal cells cannot do. What is the main function of the chloroplasts found in plant cells?
a)
to absorb light energy and manufacture food
b)
to remove waste materials by active transport
c)
to manufacture chemical energy from food
d)
to control the shape of the cell
7.
All cells need energy to function. Which cell organelle is responsible for producing energy in the cell?
a)
chloroplasts
b)
mitochondria
c)
nucleus
d)
vacuoles
8.
In what part of the plant cell does the process of photosynthesis take place?
a)
nucleus
b)
mitochondria
c)
chloroplasts
d)
vacuoles
9.
Starch and water molecules in potato cells are stored in what organelle?
a)
mitochondria
b)
nucleus
c)
cell wall
d)
vacuole
10.
What is Newton's First Law known as? The Law of
a)
Friction
b)
Mass
c)
Inertia
d)
Gravity
11.
Which type of force(s) will cause a change in an object's motion?
a)
gravity
b)
zero net force
c)
balanced forces
d)
unbalanced forces
12.
What is the name for a push or pull?
a)
A movement
b)
A force
c)
Speed
d)
Density
13.
friction is a force that acts
a)
in the same direction as the motion
b)
opposite to the direction of the motion
c)
opposite to the applied forces
d)
the same direction as the applied force
14.
What is Newton's First Law
a)
F=ma
b)
Every action has an equal and opposite reaction
c)
An object at rest stays at rest, an object in motion stays in motion.
d)
Friction
15.
A force of 90N is applied to each cart below, which one will accelerate the fastest?
a)
Cart 1
b)
Cart 2
c)
Cart 3
d)
Cart 4
16.
If you increase the mass on an object, its acceleration
a)
decreases
b)
stays the same
c)
also increases
d)
stops
17.
When a cannon fires a cannonball we observe Newton's third law. Which force is the reaction force?
a)
The cannon moving forward
b)
The cannonball moving forward
c)
The cannon moving backward
d)
The cannonball moving backward
18.
A person steps out of the boat and onto the dock. As the person moves forward onto the dock, the boat moves backward. Which statement best describes the backward motion of the boat as the person steps forward?
a)
For every action there is an equal and opposite reaction.
b)
Every mass exerts a force on every other mass.
c)
An object at rest tends to stay at rest.
d)
Friction opposes the motion of an object.
19.
Newton's third law states that any action will have a(n) _______ and ______ reaction
a)
Equal and similar
b)
Equal and opposite
c)
Equal and different
d)
Greater and opposite
20.
What keeps the planets from flying into space?
a)
Gravity of the Sun
b)
Gravity of the Earth
c)
Weight of the Sun
d)
Weight of the Earth
21.
How does friction affect speed?
a)
more friction decreases speed
b)
more friction increases speed
c)
less friction decreases speed
22.
Why a ball falls to the ground?
a)
Earth's force of gravity is GREATER than the ball's, so the ball gets attracted to the ground.
b)
Earth's force of gravity is LESS than the ball's, so the ball gets attracted to the ground.
23.
Where would you weight more, on Earth or on the Moon?
a)
Earth
b)
Moon
24.
Two factors effecting the magnitude of the force of gravity between 2 objects are...
a)
mass and distance
b)
mass and matter
c)
distance and weight
d)
weight and mass
25.
Which will stay the same if I go to the moon?
a)
Mass
b)
Weight
c)
Neither
d)
Both
26.
The strength of an electromagnet can be changed by
a)
adding less loops to the coil.
b)
adding more loops to the coil.
27.
What kind of magnet can be turned on and off?
a)
refridgerator magnet
b)
electromagnet
c)
magnetite
d)
iron
28.
In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.
a)
wire, iron, electric
b)
electric, wire, iron
c)
iron, electric, wire
d)
excited, hair, apple
29.
What happens when two north poles of a magnet are placed together?
a)
they repel
b)
they attract
c)
they cancel each other out
d)
the strength of the magnet is doubled
30.
True or False: All metals stick to magnets.
a)
True
b)
False
31.
Where is the force of attraction the strongest on a magnet?
a)
at the poles
b)
in the middle
c)
above the magnet
d)
below the magnet
32.
Which type of rock forms from extreme heat and pressure?
a)
Igneous
b)
Sedimentary
c)
Organic
d)
Metamorphic
33.
Which type of rock results from melting and cooling of magma?
a)
Igneous
b)
Metamorphic
c)
Sedimentary
d)
Extrusive
34.
Fossils are often found in ____________ because it is formed from the remains of once living things.
a)
metamorphic
b)
magma
c)
igneous
d)
sedimentary
35.
Sedimentary rocks are formed by
a)
Cooling of lava or magma
b)
Heat and pressure
c)
Compacting and cementing of other rock fragments
36.
The process by which water, ice, wind or gravity moves weathered rock and soil from one place to another.
a)
weathering
b)
erosion
c)
deposition
d)
dumptruck
37.
The natural chemical or physical processes that breaks down rock on Earth's surface.
a)
weathering
b)
erosion
c)
deposition
d)
jackhammering
38.
According to the law of superposition, which layer is the youngest?
a)
A
b)
B
c)
C
39.
Which is the most recent era of time- the one that we are currently in?
a)
Mesozoic
b)
Paleozoic
c)
Cenozoic
d)
Precambrian
40.
Why is the fossil record incomplete?
a)
fossils get eroded away over time
b)
most organisms never became fossils
c)
scavengers and decomposers eat them too quickly
d)
all of the above
41.
The disappearance of a species.
a)
Evolution
b)
Extinction
c)
Migration
d)
Mutation
42.
In transform boundaries, plates move
a)
toward each other
b)
away from each other
c)
by sliding past each other
43.
In convergent boundaries, plates move
a)
away from each other
b)
toward each other
c)
by sliding past each other
44.
In divergent boundaries plates move
a)
away from each other
b)
toward each other
c)
by sliding past one another
45.
Past environments can be determined using
a)
plate teconics
b)
fossils
c)
sea floor spreading
46.
How old is the Earth?
a)
46 billion years
b)
4 billion years
c)
.46 billion years
d)
4.6 billion years
47.
The era that takes up 90% of Earth's history is...
a)
Cenozoic
b)
Paleozoic
c)
Mesozoic
d)
Pracambrian
48.
Scientists determine what Earth’s interior looks like by using:
a)
Volcanoes
b)
Seismic Waves
c)
Continental Drift
d)
Convection Currents
49.
Which of the following correctly lists Earth's layers in order from least dense to most dense?
a)
inner core, outer core, mantle crust
b)
crust, mantle, outer core, inner core
c)
inner core, outer core, crust, mantle
d)
crust, outer core, mantle, inner core
50.
The core is mostly made up mostly of which elements?
a)
Oxygen and Silicon
b)
Silicon and Magnesium
c)
Nickel and Iron
d)
Iron and Magnesium
51.
This layer of the Earth is found between the core and the crust.
a)
mantle
b)
outer core
c)
inner core
d)
crust
52.
Which box has a higher density?
a)
Box A
b)
Box B
c)
cannot be determined
d)
they are the same
53.
Why do some substances float on water?
a)
they are warmer than water
b)
they are cooler than water
c)
they are more dense than water
d)
they are less dense than water
54.
The rim of the Pacific Ocean which has frequent volcanic eruptions and earthquakes is known as the...
a)
ring of lava
b)
ring of fire
c)
danger zone
d)
plate boundary zone
55.
Who are the best dogs in the world?
a)
Koda and Cedar
b)
Koda and Cedar
c)
Koda and Cedar
d)
Koda and Cedar
56.
Lava is found _______ the surface, and magma is found _______ the surface.
a)
below; at/above
b)
at/above; below
c)
below; below
d)
at/above; at/above
57.
A twist or bend in a river is called a...
a)
v shaped valley
b)
meander
c)
mouth
d)
erosion
58.
Oceanic crust is _________ dense compared to continental crust.
a)
more
b)
less
c)
equally
59.
The OLDEST seafloor is located?
a)
Closest to the mid-ocean ridge
b)
Farthest from the mid-ocean ridge
60.
True or False : Sea-floor Spreading adds new material to the ocean floor?
a)
True
b)
False
61.
What happens when Subduction occurs?
a)
Parts of the crust fall into the mantle
b)
Parts of the crust fall into the core
c)
Parts of the crust fall into space
d)
None of the Above
62.
The longest mountain chain in world; where new ocean floor is produced.
a)
mid-ocean ridge
b)
deep ocean trench
c)
pangaea
d)
subduction
63.
Which system absorbs oxygen and releases carbon dioxide?
a)
respiratory
b)
excretory
c)
endocrine
d)
immune
64.
Which system controls voluntary and involuntary movement?
a)
muscular
b)
skeletal
c)
immune
d)
excretory
65.
This system transports oxygen and nutrients around the body.
a)
circulatory
b)
respiratory
c)
skeletal
d)
digestive
66.
This system breaks down food into nutrients that the body can absorb.
a)
digestive
b)
excretory
c)
reproductive
d)
immune
67.
This system supports the body and protects vital organs.
a)
skeletal
b)
muscular
c)
circulatory
d)
nervous
68.
Which system sends electrical messages that helps control the body's responses to internal and external changes?
a)
nervous
b)
endocrine
c)
reproductive
d)
integumentary
69.
Lungs are the primary organs of this system.
a)
muscular system
b)
nervous system
c)
circulatory system
d)
respiratory system
70.
Which of the following is the correct order of organization in living things from most basic (simple) to most complex?
a)
a. Organism, cell, tissue, organ, organ system
b)
a. Organ system, organ, tissue, cell, organism
c)
a. Cell, tissue, organ, organ system, organism
d)
a. Cell, organ, tissue, organ, organism, organ system
71.
The basic unit of a living thing is a ________________.
a)
cell
b)
cytoplasm
c)
nucleus
d)
cell membrane
72.
In asexual reproduction, all of the offspring are:
a)
Physically Identical
b)
Genetically Identical
c)
Physically and Genetically Identical
d)
Not Identical
73.
How many parent(s)are needed for asexual?
a)
4
b)
1
c)
9
d)
100
74.
Which feature of a rose helps it grow without being eaten by large animals?
a)
flowers with bright colors
b)
sharp thorns
c)
small seeds
d)
deep roots
75.
Are all mutations bad?
a)
Yes
b)
No
76.
Any change in the sequence of DNA is...
a)
transgenic shift
b)
Single Genotype
c)
Monohybrid Trait
d)
Mutation
77.
What is a change in an organism that allows for it to survive in its environment?
a)
homologous
b)
vestigial
c)
variation
d)
adaptation
78.
Who is the father of evolution?
a)
Darwin
b)
Mendel
c)
Newton
d)
Einstein
79.
When the DNA of an organism is altered it is referred to as…
a)
Mutation
b)
Gene Flow
c)
Genetic Drift
d)
Sexual Selection
80.
The cause of artificial selection is…
a)
The environment
b)
Humans
c)
Mutation
d)
Gene Flow
81.
Darwin wrote that organisms with traits that are best suited to the environment will ________________
a)
increase in number
b)
become extinct
82.
Which of the following is NOT an example of natural selection?
a)
People selectively breeding hamsters.
b)
Insect populations developing resistance to certain pesticides.
c)
Bacteria becoming resistant to antibiotics.
d)
Male birds of certain species developing colorful feathers to attract female mates.
83.
Structures with the same parts have different functions; suggests that organisms share a common ancestry
a)
vestigial structures
b)
homologous structures
c)
adaptive radiation
d)
fossil
84.
Why are advantageous traits more likely to be passed onto offspring?
a)
Because they are more likely to survive and reproduce.
b)
Because they come from dominant alleles.
c)
Because they come from recessive alleles.
d)
Because the trait is an acquired phenotype.
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