The picture shows dinosaur tracks found in rocks. How many dinosaurs left their tracks here?
2
4
14
24
Which of these best completes the statement about the interaction of the respiratory system with the circulatory system? The lungs add —
nutrients to the blood
bile to the blood
oxygen to the blood
carbon dioxide to the blood
Which of these will cause water to change to ice?
Removing heat from the water
Stirring the water
Adding salt to the water
Putting the water in the sunlight
Crickets chirp to attract other crickets. The temperatures and rates of their chirping are graphed above. Which statement below is most likely true for the data represented in the graph?
The cooler the temperature, the louder the crickets chirp.
The crickets cannot chirp at temperatures lower than 10 degrees C.
The warmer the temperature, the more often crickets chirp.
The temperature and the chirping of crickets are not related.
Which of the following elements belongs to the family indicated?
Nitrogen belongs to the halogen family.
Helium belongs to the noble gas family.
Calcium belongs to the alkali family.
Sodium belongs to the alkaline earth family
Lemmings are small mammals that experience a population explosion about once every four years. Snowy owls eat lemmings. Which of these statements is supported by the data in this graph?
The snowy owls are becoming extinct.
Lemmings live much longer than snowy owls.
The habitat of the lemmings is continuously decreasing in size.
The snowy owl population increases because of an increase in lemmings.
Which of these has the greatest number of different simple machines?
The atom is composed of electrons, protons, and neutrons. What is the electric charge on the neutron?
-1
+1
0
+2
A tick that feeds on the blood of animals is a —
predator
host
competitor
parasite
The distance between one point on a compression and the corresponding point on the next compression in a sound wave is called a —
wavelength
rarefaction
crest
trough
Which of the following do typical plant cells have that typical animal cells do not?
Cytoplasm
Nuclei
Mitochondria
Chloroplasts
What is the mass of the rock?
335.6 g
350.6 g
354.6 g
356.0 g
The picture shows the results of putting a drop of orange ink from a marking pen on a piece of filter paper and allowing the colors in the ink to separate. About how much farther on the filter paper has the yellow pigment moved than the red pigment?
0.5 cm
1.6 cm
2.7 cm
3.5 cm
The kangaroo rat is able to get all of the water it needs through its food and, therefore, never needs to drink liquids. This animal has adapted to survive in which biome?
Forest
Tundra
Desert
Grassland
The science of astronomy is concerned with the observation and analysis of the movements of celestial objects. The invention of which instrument was most helpful to the advancement of astronomy?
Telescope
Microscope
Camera
Geiger counter
There are many reasons why the use of oil needs to be managed carefully. Which of the following is not one of these reasons?
There are only limited supplies of oil in the Earth.
Oil spills at sea have killed many marine animals.
Burning oil contributes to acid rain and the greenhouse effect.
Oil was created by plants and animals.
Several centuries ago, men called alchemists tried to transform common metals into gold. Even though they tried many different chemical and physical methods, they never succeeded because —
they could not heat common metals to extremely high temperatures
the common metals they worked with were not pure
they did not add the correct material to the common metal
elements cannot be changed to other elements by physical or chemical means
The chart shows the results of an experiment to test the effects of different plant lights on plant seedling growth. Which group of plants showed the greatest gain in height?
Group 1
Group 2
Group 3
Group 4
Mercury is a liquid metal that is used in many thermometers. The mercury in the thermometer rises because it —
is sucked upward by vacuum
expands when heated
is compressed by air pressure
increases in density when heated
Which of these could cause a decrease in the number of squirrels in a population?
An increase in cooperation with birds in the area
An increase in the squirrels’ territory
An increase in competition with other nut-eating animals
An increase in the squirrels’ food supply
The picture represents five red blood cells seen through a microscope. The lines represent a scale also visible through the microscope. Each division on the scale represents one micrometer. Use the scale to estimate the diameter of the average red blood cell.
4—5 micrometers
7—8 micrometers
10—11 micrometers
12—13 micrometers
Which level of organization below is the most basic or primary level of organization?
Cell
Tissue
Organ
Organ system
Ellen noticed that she often sneezes when she visits her friend Robert, who has a cat and a parrot. Ellen wonders if she may have allergies to Robert’s pets and decides to conduct a scientific investigation. What should Ellen do next?
Ellen should tell Robert that she cannot visit him until he gives away his pets.
Ellen should visit Sue who has a horse, a dog, a goldfish, and a hamster.
Ellen should call her doctor and insist that she needs shots for allergies.
Ellen should visit a friend who has only cats and one who has only parrots.
Because burning fossil fuels creates much pollution, alternatives are being investigated. What might limit the use of wind as a major energy source?
The strength of the wind varies.
Wind machines have huge blades to capture the wind.
Turbines and generators in the wind machines create electricity.
Wind power does not create pollution.
Sponges are classified as animals because they cannot —
move from place to place
make their own food
get rid of waste products
catch their own food
Which of the following is shown in this diagram?
Alternating current
Short circuit
Series circuit
Parallel circuit
Which of the following is a physical property of copper?
Ductile, can be drawn into a wire
Liquid at room temperature
Readily reacts with water to form an acid
Readily reacts with oxygen
Northern garter snakes exhibit a unique behavior in which they gather in deep dens by the hundreds or thousands. They then coil together in a huge ball. This behavior could help to —
reduce heat loss
increase camouflage
locate food sources
increase oxygen consumption
When plants perform photosynthesis, they use sunlight to produce food. This is an example of light energy being converted to —
heat energy
electrical energy
mechanical energy
chemical energy
Scientists have spent many years studying the peppered moth, which is a species that has adapted its color from light to dark in reaction to environmental pollution. Which of the following line graphs represents the data from the table?
Mendel’s early work with pea plants demonstrated a significant genetic discovery. The crossing of homozygous tall pea plants with homozygous short pea plants always resulted in tall plants and demonstrated that tallness in pea plants is a trait that is —
blended
dominant
mutated
recessive
At which of these points is it 12:00 noon?
1
2
3
4
Which of the following is an example of kinetic energy?
A baseball moving from the pitcher to the catcher
A rock sitting on the top of a large hill
A pendulum at the top of its swing
A new flashlight battery
Many scientists believe that nuclear fusion will become a possible energy source within the next 10 years. What resource would be most effective in tracking the progress of this energy source?
The local newspaper
A chemical encyclopedia
A physics textbook
Scientific periodical
Objects with like charges repel and unlike charges attract. The girl’s hair and the comb have —
unlike charges
like charges
neutral charges
no charges
The loss of which of these would have the least effect on the water cycle?
Soil
Rivers
Animals
Plants
Which of these processes helps extract energy from food?
Reproduction
Digestion
Excretion
Circulation
Which of these is a change in chemical composition?
A lake freezes solid.
Gravel, sand, and water are mixed.
A copper bar is rolled into a flat sheet.
Vinegar bubbles when baking soda is added.
The picture shows a test for non-slip surfaces to be used on a ramp. Which of these must be done to provide more meaningful results?
Use the same shoe on each surface
Use boards of the same thickness
Use the same shoe size for each type of shoe
Use shoes with soles designed for sports
According to this chart, which planet will most likely have the highest temperatures?
Earth
Mars
Mercury
Venus
According to this diagram, both of these fish —
eat bacteria
give off toxic wastes
take in minerals through their gills
get their energy from other animals
At which point is the magnetic field the strongest?
Point 1
Point 2
Point 3
Point 4
The picture above illustrates the habitat of a population of animals and its distance from the nearest water source. How far does an animal have to travel to obtain water?
6 centimeters
12 meters
50 meters
300 meters
Most of the hereditary information within the cell is carried in the —
ribosomes
vacuoles
chromosomes
Golgi bodies
The time in which Earth makes one revolution around the sun is approximately one —
year
season
month
day
Which picture illustrates the structure of a molecule of water?
These birds all live in Virginia. One of the bird’s main sources of food is the nectar inside long, trumpet-shaped flowers. A second bird eats mostly rodents. The third bird often is seen pecking into the bark of the local trees to get the insects just inside. Which of the following lists has correctly matched the pictured birds with their diets?