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Best 8th Grade Science Practice Ever

Total questions: 108

Worksheet time: 1hrs 7mins

Name
Class
Date
1.

Building blocks of rocks

a)

CELLS

b)

ARTERIES

c)

ISOBARS

d)

MINERALS

2.

Organisms that break down wastes and dead organisms and return raw materials to the environment

a)

ECOSYSTEM

b)

COMPOUNDS

c)

DECOMPOSERS

d)

BAROMETER

3.

Organisms that make their own food

a)

TISSUES

b)

ISOBARS

c)

BAROMETER

d)

PRODUCERS

4.
Rock formed by the solidification of molten magma
a)
IGNEOUS ROCK
b)
HOMEOSTASIS
c)
GROUP
d)
MINERALS
5.

A type of rock that forms from an existing rock that is changed by heat, pressure, or chemical reactions.

a)

METAMORPHIC ROCK

b)

METABOLISM

c)

IGNEOUS ROCK

d)

EVAPORATION

6.
The basic unit of structure and function in living things
a)
CELLS
b)
SOLUTE
c)
ATOMS
d)
MINERALS
7.
Chemical messengers that are manufactured by the endocrine glands,
a)
HORMONES
b)
ELEMENTS
c)
COMPOUNDS
d)
GAMETES
8.
Chemical produced in the digestive system that breaks down food.
a)
GAMETES
b)
ELEMENTS
c)
TISSUES
d)
ENZYMES
9.
Collection of glands that secrete hormones into the blood.
a)
DIGESTIVE SYSTEM
b)
ENDOCRINE SYSTEM
c)
ECOSYSTEM
d)
NERVOUS SYSTEM
10.

Consists of brain, spinal cord, and nerves.

a)

EXCRETORY SYSTEM

b)

SKELETAL SYSTEM

c)

NERVOUS SYSTEM

d)

ECOSYSTEM

11.

A change in an organism's surroundings that causes the organism to react

a)

STIMULUS

b)

ATOMS

c)

TISSUES

d)

ELEMENTS

12.

Process by which organisms maintain a relatively stable internal environment

a)

PHOTOSYNTHESIS

b)

HYPOTHESIS

c)

HOMOZYGOUS

d)

HOMEOSTASIS

13.

All of the chemical reactions that occur within an organism

a)

ATOMS

b)

METABOLISM

c)

CELLS

d)

ROTATION

14.

Eliminates waste products. Organs including the kidneys, liver, skin, large intestine, and lungs.

a)

CIRCULATORY SYSTEM

b)

EXCRETORY SYSTEM

c)

SKELETAL SYSTEM

d)

NERVOUS SYSTEM

15.

Breaks down food and provides nutrients for the body.

a)

ENDOCRINE SYSTEM

b)

DIGESTIVE SYSTEM

c)

NERVOUS SYSTEM

d)

EXCRETORY SYSTEM

16.

The variable whose effect is being studied and is changed at the start. Made different.

a)

PERIODIC TABLE

b)

DEPENDENT VARIABLE

c)

NON-RENEWABLE

d)

INDEPENDENT VARIABLE

17.
The variable that is measured in an experiment. The end result.
a)
DEPENDENT VARIABLE
b)
PERIODIC TABLE
c)
INDEPENDENT VARIABLE
d)
PUNNETT SQUARE
18.

A testable prediction.

a)

HYPOTHESIS

b)

GAMETES

c)

HOMEOSTASIS

d)

PHOTOSYNTHESIS

19.

Groups of similar cells that have a common function

a)

ENZYMES

b)

STIMULUS

c)

GAMETES

d)

TISSUES

20.

Blood vessels that carry blood away from the heart.

a)

PERIOD

b)

GAMETES

c)

MINERALS

d)

ARTERIES

21.
Consists of the heart, blood, and all of the blood vessels.
a)
EXCRETORY SYSTEM
b)
CIRCULATORY SYSTEM
c)
DIGESTIVE SYSTEM
d)
NERVOUS SYSTEM
22.
Protects and supports the body. Consists of the bones, their associated cartilages, and the joints.
a)
EXCRETORY SYSTEM
b)
DIGESTIVE SYSTEM
c)
SKELETAL SYSTEM
d)
NERVOUS SYSTEM
23.

Diagram showing the gene combinations that might result from a genetic cross of parental genes

a)

MOMENTUM

b)

LITHOSPHERE

c)

OZONE LAYER

d)

PUNNETT SQUARE

24.
Trait that is always expressed in an organism's.
a)
DOMINANT
b)
MOMENTUM
c)
SOLVENT
d)
POLLUTANT
25.

Trait that will only appear in the phenotype but will not be observed in the organism

a)

RECESSIVE

b)

CELLS

c)

ECOSYSTEM

d)

RENEWABLE

26.

Term used to refer to an organism that has two identical alleles for a particular trait

a)

HETEROZYGOUS

b)

HORMONES

c)

HOMOZYGOUS

d)

HOMEOSTASIS

27.

Term used to refer to an organism that has two different alleles for the same trait.

a)

HOMEOSTASIS

b)

HETEROZYGOUS

c)

HOMOZYGOUS

d)

ENZYMES

28.
The progressive replacement of one dominant type of species or community by another in an ecosystem
a)
FRICTION
b)
REFRACTION
c)
RECESSIVE
d)
NATURAL SUCCESSION
29.
The human practice of breeding animals or plants that have certain desired traits
a)
DIGESTIVE SYSTEM
b)
CONVECTION CURRENT
c)
GENETIC ENGINEERING
d)
SELECTIVE BREEDING
30.
Process in sexual reproduction in which male and female reproductive cells join to form a new cell
a)
FERTILIZATION
b)
RADIATION
c)
FRICTION
d)
FILTRATION
31.

Reproductive cells have only half the number of chromosomes as body cells.

a)

BAROMETER

b)

ARTERIES

c)

GAMETES

d)

ATOMS

32.

When the offspring is genetically identical to a single parent

a)

REVOLUTION

b)

REFRACTION

c)

ASEXUAL REPRODUCTION

d)

EVAPORATION

33.

Making a genetically identical copy of DNA or of an organism.

a)

CLIMATE

b)

CANCER

c)

SOLUTE

d)

CLONING

34.
The transfer of a gene from the DNA of one organism into another organism, in order to produce an organism with desired traits
a)
FERTILIZATION
b)
GENETIC ENGINEERING
c)
SELECTIVE BREEDING
d)
RECESSIVE
35.

The smallest unit of matter.

a)

GROUP

b)

CELLS

c)

ATOMS

d)

ENZYMES

36.

An arrangement of elements in which the elements are separated into groups based on a set of repeating properties.

a)

RENEWABLE

b)

PRODUCERS

c)

PERIODIC TABLE

d)

PERIOD

37.

Horizontal row of elements in the periodic table

a)

GROUP

b)

CELLS

c)

ARTERIES

d)

PERIOD

38.
Vertical column of elements in the periodic table
a)
GROUP
b)
SOLUTE
c)
PERIOD
d)
ATOMS
39.

The substance that is dissolved

a)

SOLVENT

b)

GAMETES

c)

SOLUTE

d)

CLIMATE

40.

The substance that does the dissolving, for example, water.

a)

SOLVENT

b)

ELEMENTS

c)

SOLUTE

d)

POLLUTANT

41.

A process that separates materials based on the size of their particles.

a)

Respiration

b)

Friction

c)

Filtration

d)

Rotation

42.

Air is cool and dry with clear, calm weather.

a)

DIGESTIVE SYSTEM

b)

HIGH PRESSURE SYSTEM

c)

EXCRETORY SYSTEM

d)

LOW PRESSURE SYSTEM

43.

Brings precipitation, warmer temperatures, high cloud cover, high winds.

a)

LOW PRESSURE SYSTEM

b)

DIGESTIVE SYSTEM

c)

HIGH PRESSURE SYSTEM

d)

EXCRETORY SYSTEM

44.

A huge body of air that has similar temperature, humidity, and air pressure at any given height

a)

ATOMS

b)

AIR MASS

c)

ISOBARS

d)

MINERALS

45.

The boundary that forms when two different air masses meet and causes precipitation.

a)

FILTRATION

b)

WEATHER FRONT

c)

EVAPORATION

d)

WEATHER

46.
Instrument used to measure wind speed
a)
BAROMETER
b)
ANEMOMETER
c)
MOMENTUM
d)
GAMETES
47.

An instrument used to measure atmospheric pressure

a)

ANEMOMETER

b)

GAMETES

c)

BAROMETER

d)

CLIMATE

48.
Lines joining places on the map that have the same air pressure
a)
TISSUES
b)
ISOBARS
c)
SOLUTE
d)
AIR MASS
49.

The average weather conditions in an area over a long period of time

a)

SOLUTE

b)

CLIMATE

c)

GAMETES

d)

CLONING

50.

The condition of Earth's atmosphere at a particular time and place.

a)

ATOMS

b)

CANCER

c)

WEATHER

d)

MANTLE

51.
the amount of moisture in the air
a)
ROTATION
b)
HUMIDITY
c)
DOMINANT
d)
CLIMATE
52.
the change of a substance from a liquid to a gas
a)
ROTATION
b)
RADIATION
c)
RESPIRATION
d)
EVAPORATION
53.
the change of state from a gas to a liquid
a)
ROTATION
b)
CONSTELLATION
c)
RADIATION
d)
CONDENSATION
54.
the falling to earth of any form of water (rain or snow or hail or sleet or mist)
a)
PRECIPITATION
b)
ROTATION
c)
RESPIRATION
d)
RADIATION
55.
individual sections of the lithosphere of the earth. They fit together in a way similar to a jigsaw puzzle, but are always moving very slowly, floating on the molten rock of the lower mantle.
a)
PERIODIC TABLE
b)
OZONE LAYER
c)
CLIMATE
d)
TECTONIC PLATES
56.
the layer of the earth between the crust and the core
a)
CANCER
b)
MANTLE
c)
SOLUTE
d)
WEATHER
57.
the solid, outer layer of the earth that consists of the crust and the rigid upper part of the mantle
a)
PRODUCERS
b)
HYDROSPHERE
c)
LITHOSPHERE
d)
BAROMETER
58.
the watery layer of the earth's surface
a)
LITHOSPHERE
b)
HYDROSPHERE
c)
PRODUCERS
d)
HYPOTHESIS
59.
layer of the stratosphere with a high concentration of ozone; absorbs most of the Sun's harmful ultraviolet radiation
a)
ANEMOMETER
b)
MANTLE
c)
BAROMETER
d)
OZONE LAYER
60.
Examples: H2O, CO2, O3, Effect: they trap outgoing infrared (heat) energy, causing Earth to warm
a)
GREENHOUSE GASES
b)
HOMEOSTASIS
c)
NERVOUS SYSTEM
d)
IGNEOUS ROCK
61.
the transfer of thermal energy by the circulation or movement of a liquid or gas
a)
WEATHER FRONT
b)
SELECTIVE BREEDING
c)
CONDENSATION
d)
CONVECTION CURRENT
62.
energy that is radiated or transmitted in the form of rays or waves or particles
a)
REFRACTION
b)
FRICTION
c)
ROTATION
d)
RADIATION
63.
resource that can be replaces relatively quickly by natural process
a)
RECESSIVE
b)
MINERALS
c)
NON-RENEWABLE
d)
RENEWABLE
64.
A resource that cannot be remade quickly or cannot be remade at all
a)
NON-RENEWABLE
b)
RENEWABLE
c)
RECESSIVE
d)
CONDENSATION
65.
series of steps in an ecosystem in which organisms transfer energy by eating and being eaten
a)
FRICTION
b)
PRODUCERS
c)
FOOD CHAIN
d)
FOOD WEB
66.
a diagram that shows the feeding relationships between organisms in an ecosystem
a)
HORMONES
b)
SOLUTE
c)
FOOD WEB
d)
FOOD CHAIN
67.
collection of all the organisms that live in a particular place, together with their nonliving environment
a)
RECESSIVE
b)
SOLUTE
c)
MOMENTUM
d)
ECOSYSTEM
68.
spinning of Earth on its imaginary axis, which takes about 24 hours to complete and causes day and night to occur
a)
REFRACTION
b)
FILTRATION
c)
RADIATION
d)
ROTATION
69.
the movement of an object around another object
a)
REFRACTION
b)
RESPIRATION
c)
ROTATION
d)
REVOLUTION
70.
The bending of a wave caused by a change in its speed as it moves from one medium to another
a)
REVOLUTION
b)
RESPIRATION
c)
REFRACTION
d)
FRICTION
71.
the force or speed with which something moves
a)
DOMINANT
b)
SOLVENT
c)
MANTLE
d)
MOMENTUM
72.
the resistance encountered when one body is moved in contact with another
a)
REFRACTION
b)
FRICTION
c)
ROTATION
d)
RADIATION
73.
An object in motion will continue in motion unless acted upon by an unbalanced force. An object at rest will remain at rest until acted upon by an unbalanced force. (Seatbelt)
a)
NEWTONS 1ST LAW
b)
NERVOUS SYSTEM
c)
NEWTONS 3RD LAW
d)
NEWTONS 2ND LAW
74.
Force=Mass times Acceleration. (Larger mass needs more force)
a)
NEWTONS 1ST LAW
b)
NEWTONS 3RD LAW
c)
NERVOUS SYSTEM
d)
NEWTONS 2ND LAW
75.
For every action force there is an equal and opposite reaction force
a)
NEWTONS 3RD LAW
b)
NERVOUS SYSTEM
c)
NEWTONS 2ND LAW
d)
NEWTONS 1ST LAW
76.
the blocking of sunlight to the moon that occurs when earth is directly between the sun and the moon
a)
LUNAR ECLIPSE
b)
ARTERIES
c)
SOLAR ECLIPSE
d)
METABOLISM
77.
the blocking of sunlight to Earth that occurs when the moon is directly between the sun and Earth
a)
LUNAR ECLIPSE
b)
ARTERIES
c)
ISOBARS
d)
SOLAR ECLIPSE
78.
A group of stars that form a pattern in the sky
a)
ROTATION
b)
CONSTELLATION
c)
RESPIRATION
d)
CONDENSATION
79.
powerhouse of the cell.
a)
MITOCHONDRIA
b)
METABOLISM
c)
COMPOUNDS
d)
MOMENTUM
80.
process by which plants use the sun's energy to convert water and carbon dioxide into sugars
a)
HYPOTHESIS
b)
HOMEOSTASIS
c)
PHOTOSYNTHESIS
d)
ECOSYSTEM
81.
The process by which cells break down simple food molecules to release the energy they contain.
a)
REFRACTION
b)
EVAPORATION
c)
RADIATION
d)
RESPIRATION
82.
a rigid layer of nonliving material that surrounds the cells of plants and some other organisms
a)
CELLS
b)
CELL WALL
c)
POLLUTANT
d)
RENEWABLE
83.
thin, flexible barrier around a cell; regulates what enters and leaves the cell
a)
CELL MEMBRANE
b)
ELEMENTS
c)
CLIMATE
d)
CELL WALL
84.
uncontrolled or abnormal cell division
a)
WEATHER
b)
CANCER
c)
CLONING
d)
MANTLE
85.
harmful material that can enter the biosphere through the land, air, or water
a)
POLLUTANT
b)
DOMINANT
c)
SOLUTE
d)
SOLVENT
86.
a change in a substance that does not involve a change in the identity of the substance
a)
CHEMICAL CHANGE
b)
POLLUTANT
c)
PERIODIC TABLE
d)
PHYSICAL CHANGE
87.
a change that occurs when one or more substances change into entirely new substances with different properties
a)
CELL MEMBRANE
b)
PHYSICAL CHANGE
c)
CELL WALL
d)
CHEMICAL CHANGE
88.
Two or more elements chemically combined
a)
DECOMPOSERS
b)
HORMONES
c)
DOMINANT
d)
COMPOUNDS
89.
a pure substance that is made up of only one kind of atom
a)
GAMETES
b)
ELEMENTS
c)
SOLVENT
d)
CLIMATE
90.

Which model correctly shows that the mass is conserved in the reaction? 

a)
b)
c)
d)
91.

Which model correctly shows that the mass is conserved in the reaction? 

a)
b)
c)
d)
92.

In this equation, the reactants are on the

a)

left of the arrow

b)

right of the arrow

93.

In this equation, the products are on the

a)

left of the arrow

b)

right of the arrow

94.

Because this model shows atoms connected by a chemical bond, you are looking at

a)

atoms

b)

single elements

c)

molecules or compounds

95.

Leah is learning to use properties of substances to identify a chemical reaction. She conducts two trials. In the first trial, she pours silicon dioxide (SiO2) into water (H2O). For the second trial, she pours silver nitrate (AgNO3) solution into a test tube with a solution of potassium chloride (KCl). Look at the diagram. In which trial did a chemical reaction occur?


(a)  
Choose from the below words
Trial 2
Trial 1
Both trial 1 and trial 2
No chemical reaction happened in either
96.

According to this model, Fe, or Iron, is represented by

a)
b)
c)
d)
97.

According to this model, what are the products made from the chemical reaction?


(a)  
Choose from the below words
FeSO4
Fe
CuSO4
Cu
98.

How many atoms make up CuSO4 ?

(a)  

99.

Which model correctly shows that the mass is conserved in the reaction? 

a)
b)
c)
d)
100.

(a)   is stored energy. 

101.

Energy due to motion is (a)   energy. 

102.

On a hot summer day, a piece of ice is removed from a cooler and placed in a cup that is sitting on a picnic table. Which of the following statements are true about what happens to the ice and the cup over time? Choose the two that apply.

a)

Heat moves from the ice to the cup.

b)

The particles in the ice start to move faster.

c)

Both the ice and the cup change state.

d)

The cup changes temperature.

103.

Once the solid gains enough thermal energy, it can change to a (a)   state.

104.

What is the chemical symbol for Lithium?

(a)  

105.
At higher temperatures
a)
particles in an object have less energy
b)
particles in an object move faster
c)
a gas contracts
106.
A physical change is...
a)
a change that doesn't change the identity
b)
a change that makes something new.
c)
a chemical reaction
107.
A chemical change
a)
doesn't really change much.
b)
creates a new substance
c)
is a change in the state of matter
108.
What is the net force?
(a)  
Choose from the below words
40 N right
40 N left
0 N Balanced
400 N right

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