Download 8th Grade Practice MCT2

MCT 2 Prep Practice Science Test
Study the food web below. Then answer question number 1.
1. When a subdivision of houses is built, natural organisms are
forced from their natural habitat. Which organism in the food web
diagram is MOST at risk of being permanently displaced if a
subdivision were developed in its area?
A
B
C
D
Ants
Bacteria
Foxes
Trees
2. Which of the following is an example of genetic engineering?
A
B
C
D
growing a whole plant from a single cell.
finding the sequences of bases in plant DNA.
inserting a gene into plants that makes them resistant to insects.
attaching the root of one type of plant to the stem of another type of plant
3. Which is an example of water condensing?
A
B
C
D
A puddle disappearing on a hot summer afternoon
Sweat forming on your forehead after you do a lot of exercise
Ice cubes melting when you put them out in the sun
Dew forming on plants during a cold night
4. In the picture of a cell below, which label indicates the part of the
cell that contains most of the cell’s genetic material?
A
B
C
D
1
2
3
4
5. Julio wanted to know how his pulse rate changed when he ran very
fast. He measured his pulse rate before he started running, while he
was running, and two minutes after he stopped running. Which graph
best shows how Julio's pulse rate changed?
A
B
C
D
6. How to do most fish get the oxygen they need to survive?
A
B
C
D
They take in the water and break down into hydrogen and oxygen.
Using their gills, they take in oxygen that is dissolved in water.
They get their oxygen from the food they eat.
They come to the surface every few minutes to breathe air into their lungs.
7. All of the following are examples of erosion EXCEPT ----
A The wind in the desert blows sand against rock.
B A glacier picks up boulders as it moves.
C A flood washed over a riverbank, and the water carries small soil particles
downstream.
D An icy winter causes the pavement in a road to crack.
8. Which of the following living things a pond system uses the
energy from sunlight to make its own food?
A
B
C
D
Insect
Frog
Water lily
Small fish
9. Which living things in a pond system break down dead plants and
animals?
A
B
C
D
Green algae
Bacteria
Rushes
Frogs
10.If air pollution causes the rain that falls on a pond to become
much more acidic, after two years how will this acidity affect the
living things in the pond?
A There will be more plants and animals because the acid is a source of
food.
B There will be fewer plants and animals because the acid will dissolve many
of them.
C There will be fewer plants and animals because many of them cannot
survive in water with high acidity.
D. There will be more plants and animals because the acid will kill most of
the disease-causing microorganisms.
11. To keep a heavy box sliding across a carpeted floor at constant
speed, a person must continually exert a force on the box. This force is
used primarily to overcome which of the following forces?
A air resistance
B the weight of the box
C the frictional force exerted by the floor on the box
D the gravitational force exerted by the Earth on the box
Study the diagram below. Then answer the number 12.
12. Which of the following describes the type of bonding shown in
the diagram?
A
B
C
D
Covalent
Ionic
Metallic
Nuclear
13. Which of the following is designed to convert energy into
mechanical work?
A
B
C
D
Electric fan
Kerosene heater
Flashlight
Baking oven
Study the diagram below. Then answer number 14.
14. Which phase of mitosis is represented by the diagram above?
A
B
C
D
prophase
telophase
anaphase
metaphase
Directions: Read the passage as well as study the diagram. Then
answer number 15.
Sarah looked at some pond water with a microscope. She used the lowpower objective lens to look at some green algae. The picture below
shows what Sarah saw through the microscope.
15. What is the role of the pond organism that Sarah saw in her field
of view?
A
B
C
D
Producer
Primary consumer
Secondary consumer
Decomposer
16. Household appliances convert electricity into one or more
different forms of energy. An electric fan can best be described as
converting electricity into--
A
B
C
D
heat energy only
heat energy and sound energy only
heat energy, sound energy, and mechanical energy only
heat energy, sound energy, mechanical energy, and chemical energy
16. Which zones in the map above are MOST LIKELY to have a
temperate climate (warm summers and cold winters)?
A
B
C
D
1 and 6
2 and 5
3 and 4
1, 2, and 3
18. Right before Anna was about to run in a long race, she drank a
large glass of orange juice to get energy. Tell how the energy that was
in the orange juice actually came from the Sun.
19. Maria has one glass of pure water and one glass of salt water,
which look exactly alike. Explain what Maria could do, without tasting
the water, to find out which glass contains the salt water.
20. Based on the information in the table above, which is a
reasonable hypothesis regarding elements and their
compounds?
A An element retains its physical and chemical properties when it is
combined into a compound.
B When an element reacts to form a compound, its chemical properties are
changed but its physical properties are not.
C When an element reacts to form a compound, its physical properties are
changed but its chemical properties are not.
D Both the chemical and physical properties of a compound are different
from the properties of the elements of which it is composed.
21. When propane gas reacts with oxygen in the air to form carbon
dioxide and water, heat is released. What is the source of this heat
energy?
A The kinetic energy of the oxygen
B The kinetic energy of the propane
C The nuclear energy stored in the oxygen and propane
D The chemical energy stored in the oxygen and propane
22. Animals that reproduce sexually differ from animals that reproduce
asexually in that sexually reproducing animal’s have---A a larger number of offspring
B more genetic variation among their offspring
C offspring that are nearly identical to their parents
D offspring that are perfectly adapted to their parents” habitat
23. Air in the atmosphere continuously moves by convection. At the
equator, air rises; at the poles, it sinks. This occurs because---
A the Earth's ozone layer is thinner at the equator than at the poles
B the Earth's magnetic field is stronger at the poles than at the equator
C warm air can hold less water vapor than can cold air
D warm air is less dense than cold air
24. According to the equation below, what happened to the carbon and
the oxygen?
A They combined chemically to form a new compound.
B They combined chemically to form carbon and oxygen.
C They combined physically to form a new compound.
D They combined physically to form a new element.
25. Where does water in a lake get most of its energy to evaporate?
A) The sun heating the lake
B) Green plants living in the lake
C) Streams entering the lake
D) Cold springs under the lake
26. In animal cells like the one shown below, which organelle is used
for storing water?
A
B
C
D
Nucleus
Mitochondrion
Ribosome
Vacuole
27. According to the diagram below, what type of boundary is
shown?
A
B
C
D
convergent
divergent
transform
strike-slip
28. Which of the following chemical equations are NOT balanced?
A CH4 + 2O2 ------------------- CO2 + 2H20
B 2H2 + O2 ------------------- 2H20
C H2 + O2 ----------------- H2O
D 3Na + AlCl3 ------------- 3NaCl + Al
29. According to the diagram, which type of electromagnetic wave
has a wavelength shorter than that of yellow light?
A
B
C
D
Infrared radiation
UV Rays
X-Rays
Gamma Rays
30.
A dominant gene that codes for white hair is represented by the symbol W. If a parent
with the genotype WW is crossed with a parent of genotype Ww, what percent of their
offspring will have white hair?
A
25%
B
50%
C
75%
D
100%
31.
Which of these type of instruments was MOST important in discovering the nucleus
of the cell?
A
C
B
D
32.
The phenotype of an animal depends MOST directly on ––
A
how the genes of the animal are expressed.
B
the metabolic rate of the animal.
C
the source of the animal’s food.
D
how many cells are in the animal’s body.
33.
Meiosis is different from mitosis because meiosis produces —
A
consistent genetic makeup of all gametes.
B
larger daughter cells.
C
two gametes for every original parent cell.
D
cells with half the number of chromosomes.
34.
All of the following are classification levels EXCEPT —
A
order.
B
protist.
C
phylum.
D
class.
35.
In guinea pigs, the trait for ruffled fur is dominant over the trait for smooth fur. If a
heterozygous male is crossed with a homozygous recessive female, what percent of the
offspring would be expected to have ruffled fur?
A
25%
B
50%
C
75%
D
100%
36.
The part of the cell marked by the arrow is the —
A
cytoplasm.
B
chloroplast.
C
mitochondrion.
D
chlorophyll.
37.
Drug manufacturers must test their new products before they can be marketed. A pill
containing a new drug was given to participants in Group A. A pill containing NO drug
was given to the same number of participants in Group B. In this test, the drug given to
the participants in Group A was the —
A
conclusion.
B
hypothesis.
C
dependent variable.
D
independent variable.
38. A MAJOR difference between an earthworm and a snake is that the earthworm
lacks —
A
blood vessels.
B
nerves.
C
a backbone.
D
a digestive tract.
39. What is the source of all food energy in a swamp, and everywhere else?
F
G
H
J
green plants
sunlight
first-order consumers
second-order consumers
40. Which diagram BEST represents the type of plate movement that results in mountain
building?
A
B
C
D
41. Ants and beetles compete for resources at some elevations. Scientists collect leaf litter
from different elevations. The scientists recorded the number of ants and the number of
beetles found in the leaf litter at each elevation and created graphs showing the data.
Which conclusion do the data BEST support?
A Ants are the prey species of beetles.
B Ants have high survival rates with fewer competitors.
C Ants have large populations when many beetles are in the community.
D Ants are more likely to survive at higher elevations than at lower elevations.
42. The San Andreas Fault is a transform fault that is located at the border of the North
American Plate and the Pacific Plate.
What would MOST LIKELY form along this fault if it were a convergent fault rather
than a transform fault?
A Rivers
B Mountains
C Rift Valleys
D Island Chains
43. Which of the following BEST demonstrates kinetic energy?
A Light bulb
B Book on shelf
C Bird in flight
D Flashlight battery
44. The table below shows the products formed when different materials rust.
Which of the following will MOST LIKELY show properties of rust?
A Helium
B Oxygen
C Chlorine
D Copper
45. Which molecule in the equation represents food energy made by plants?
A
B
C
D
Carbon dioxide
Water
Glucose
Oxygen