ACHIEVEMENT TEST REVIEW

PART2

Which of the following methods would provide the most accurate information for students collecting data about local attitudes concerning the use of alternative fuels for automobiles? F Take an opinion poll of drivers G Listen to speeches given by politicians H Study newspaper articles J Track prices at nearby gas stations

12 WHICH BIRD’S FOOT IS BEST ADAPTED TOFLYING INTO A REGION AND PICKING UPPREY?

ANS. J

The diagram shows a simplified nitrogen cycle. Which process is responsible for returning nitrogen to the air? F Excretion G Decomposition H Photosynthesis J Nitrification

In the lab setup pictured above, a student is trying to determine the effect of pollutants on the growth of three groups of seeds. The results will not be valid because the experiment

has no — A conclusion B hypothesis C control D variable

Cowbirds often lay eggs in the nests of other songbirds. The young cowbirds

grow up hearing the songs of their foster parents but sing cowbird songs when they are adults. This is an example of —

A imprinting B instinct C mimicry D camouflage

If a student needed to obtain 8.0 mL of liquid for an experiment, the

appropriate piece of laboratory equipment to use would be a — A 50 mL beaker B 1.0 mL pipet C 50 mL flask D 10.0 mL graduated cylinder

Which of the following best describes

why an experiment should be repeated?

A To organize the data B To produce a variety of results C To include another variable D To verify the observed results

If a lab group were using hydrochloric

acid to perform a substitution reaction,

which precaution would not be a

concern? A Flammability B Health C Reactivity D Contact

FIRST MEASUREMENT: 6.293 GSECOND MEASUREMENT: 6.294 GTHIRD MEASUREMENT: 6.295 G A student obtained these data after

measuring the mass of an object three different times. If the true value of the object’s mass is 5.550 g, these data are best described as — F precise but not accurate G accurate but not precise H accurate and precise J neither accurate nor precise

A team of chemistry students made the above measurements and density

calculations of the same type of material. The accepted value (true value) of the density of the material is 5.72 g/cm3. Which trial has the least amount of absolute error?

A 1 B 2 C 3 D 4

The energy required to melt a solid into a liquid is called —

F heat of vaporization G heat of fusion H cooling curve J triple point

The figure shows an experimental setup used to separate the

components of a colored ink sample. Which of

the following describes this

laboratory technique? A Chromatography B Filtration C Decanting D Distillation

Which basic lab technique involves the separation of a mixture’s components through differences in particle size?

A Filtration B Extraction C Distillation D Crystallization

The atomic number corresponds to an atom’s number of —

F protons G neutrons H electrons J positrons

Which element naturally occurs as a diatomic molecule?

A Zn B C C K D H

How should 0.000365 be expressed in proper scientific notation?

F 3.65 104

G 365 H 3.65 J 3.65 10-4

What is represented by the pH of a solution? F Partial pressure of hydrogen ions in

the solution G Electronegativity of dissociated hydrogen ions in the solution H Concentration of hydrogen ions in

the solution J Temperature of hydrogen ions in the solution

Gravitational potential energy is the energy an object possesses due to its position

relative to Earth’s surface. Which of the following involve the conversion of gravitational potential energy into electric energy?

A. solar cell generators B. nuclear power plants C. wind electric generators D. hydroelectric power plants

Studies from 1830 indicated that a remote island chain in the Pacific Ocean had 13 separate species of finches. Each finch species had a distinctive beak shape that was specialized for eating a particular type of food. In spite of these differences, there were strong similarities shared by the finches. A scientist hypothesized that the 13 species of finches descended from a common ancestor. Which of the following factors produced variation in the finch species?

A. mutation B. extinction C. overpopulation D. artificial selection

KEVIN HYPOTHESIZED THAT DARK COLORS ABSORB MORE HEAT THAN LIGHT COLORS. HE PUT EQUAL QUANTITIES OF WATER IN A CAN COVERED WITH BLACK PAPER AND IN A CAN COVERED WITH WHITE PAPER. KEVIN MEASURED THE TEMPERATURE OF THE WATER IN EACH CAN AT REGULAR INTERVALS ON SEVERAL SUNNY DAYS. HE CONSTRUCTED A GRAPH TO DISPLAY THE AVERAGE TEMPERATURE OF EACH CAN OVER THE COURSE OF HIS EXPERIMENT.

Which of the following actions made Kevin’s experiment more valid?

A. He graphed his results. B. He used a lengthy procedure. C. He repeated his experiment on several days. D. He recorded the temperature in metric units.

SAM DROPS A RUBBER BALL FROM THE TOP OF A STAIRCASE TO HIS FRIEND, AS SHOWN IN THE PICTURE BELOW. THE SPEED OF THE BALL INCREASES AS IT GETS FARTHER AWAY FROM SAM’S HAND.

What is the best explanation for the increase in the speed of the ball?

F. Electric forces are acting on the ball.

G. Air resistance is accelerating the ball.

H. Magnetic forces are pushing the ball.

I. Gravitational force is pulling on the ball

MELISSA WANTS TO HELP HER FRIEND LIFT A BOX USING A BOARD AND A ROCK.

Where should Melissa position the fulcrum in order to minimize the amount of force needed to lift the box?

A. Point A B. Point B C. Point C D. Point D

Which of the following has the largest population in the Indian River Lagoon ecosystem?

F. crab G. egret H. flounder I. phytoplankton

In the Indian River Lagoon ecosystem, many organisms compete with one another for food sources. Which organism in the food web competes with egrets for food?

A. clam worm B. crab C. flounder D. heron

Which of the following statements most accurately describes the energy transfer between the levels of the food pyramid in the Indian River Lagoon?

F. Energy travels up the pyramid.

G. Energy stays in the phytoplankton at the lowest level.

H. Energy is released into the environment only at the top level.

I. Energy moves from the flounder to both the clam worms and egret.

An experiment was conducted in a lab to determine the effects of dioxin, a toxic chemical that causes damage to living organisms. A different concentration of dioxin was added to each of ten tanks that contained identical samples of aquatic plants in water. After a month, observations were recorded, the plants were discarded, and the solution from each tank was poured down the laboratory sink. What is the best way to improve this experiment in order to minimize the effects of dioxin on the environment?

F. use animals rather than plants G. use a single concentration of dioxin H. review the results with another scientist I. discard the materials at a hazardous-waste

site

Michael studied the effects of temperature and pressure on the expansion rate of gases. When publishing the results of the experiment for others to study, which of the following would be most important for Michael to include?

A. detailed steps in the procedures used B. cost of the materials used in the

study C. acknowledgement of family

members D. name of the building where the

experiments were performed

Gail’s cross-country coach advised her to eat well-balanced meals in order to have plenty of energy for their upcoming track meet. To which transformation of energy is Gail’s coach referring?

A. heat energy to mechanical energy B. mechanical energy to electrical

energy C. chemical energy to mechanical

energy D. thermodynamic energy to dynamic

energy

Planarians are freshwater organisms that can regenerate. Sonia had three petri dishes of planarians. In the same room, the first petri dish was inside a cabinet, the second petri dish was sitting on her desk, and the third petri dish was partially covered by a book. After one hour, she noted the distribution of the planarians in each petri dish. Which was the independent variable in her experiment?

A. color B. light C. movement D. temperature

COLLARED DOVES HAVE A BLACK HALF-COLLAR, DARK FEATHERS, AND A LONG, WHITE-EDGED TAIL. UNTIL 1953, THE COLLARED DOVE HAD NEVER BEEN SEEN IN THE UNITED KINGDOM. THE GRAPH BELOW SHOWS THE POPULATION GROWTH OF THE COLLARED DOVE AFTER IT FIRST ARRIVED IN THE UNITED KINGDOM.

Which of the following best explains why the curve flattens out at the X mark?

A. Predators could not catch the doves. B. Food in the environment was limited. C. Severe winters destroyed nesting sites. D. The doves were able to find many mates.

THE GRAPH BELOW SHOWS THE RELATIONSHIP OF THE MASS IN GRAMS (G) OF THREE LIQUIDS AT THE SAME TEMPERATURE AND WITH THE SAME VOLUME.

Which conclusion about density can be drawn from this graph?

F. Density is not always related to mass and volume.

G. Substances of different volumes have the same density.

H. It is less difficult to measure the density of liquids than of solids.

I. Equal volumes of different substances may have different densities.

Einstein and Galileo each made many important discoveries in science that changed the scientific world. What do their discoveries suggest about the process of scientific study?

F. Some branches of science are hard to study without equipment.

G. Lack of sophisticated equipment is a limiting factor for researchers.

H. It is easier to make major discoveries when scientists have less equipment.

I. Some discoveries are possible without the use of sophisticated equipment.

MR. MOLINA’S CLASS STUDIED THE MASS AND VOLUME OF THREE LIQUIDS.

What is the difference in density between the least and the greatest density of the liquids listed in the table?

A. 0.09 g/cm3

B. 0.10 g/cm3

C. 0.16 g/cm3

D. 1.08 g/cm3

Soil organisms, such as fungi, worms, and bacteria, are all biotic parts of the woodland ecosystem. What is the role of these organisms in the woodland ecosystem?

F. to provide nitrogen for the animals G. to obtain dissolved oxygen from moisture H. to break down the remains of other living

things I. to store chlorophyll for the photosynthesis

process

AN EQUAL AMOUNT OF POTTING SOIL WAS PLACED IN THREE IDENTICAL POTS. TWENTY PETUNIA SEEDS WERE USED. THREE SEEDS WERE PLANTED IN POT A, SEVEN SEEDS IN POT B, AND TEN SEEDS IN POT C. THE POTS WERE ALL PLACED ON THE SAME TABLE, AND AFTER THEY GREW TO A HEIGHT OF ABOUT 10 CENTIMETERS (CM), THE PLANTS FROM EACH POT WERE CUT OFF AT SOIL LEVEL, DRIED OVERNIGHT, AND WEIGHED. THE CHART BELOW SHOWS THE AVERAGE PLANT MASS FROM EACH POT.

What is the variable in this investigation? F. the soil G. the temperature H. the mass of each plant I. the space available for each seed

When brown tree snakes were first introduced to the island of Guam, they had no natural predators. These snakes sought out and ate many of the eggs of insect-eating birds. What probably occurred after the introduction of the brown tree snakes?

F. The bird population increased. G. The insect population increased. H. The bird population began to seek a

new food source. I. The insect population began to seek a

new food source.

Carmen conducted an experiment to determine if listening to different types of music would affect a person’s pulse. Her hypothesis was that pulse rate would change with different types of music. Each person listened to seven different selections of music for 30 seconds each. Each person’s pulse was taken before the music and then after each 30 second interval of music. The pulses were taken again after the music selections were completed. Based on her experiment, Carmen concluded that a person’s pulse rate changed when the person listened to different types of music.

Which component is missing from Carmen’s experiment?

A. a question B. a hypothesis C. a control group D. a description of the experiment

Plants use many gallons of water every day. Almost all of the water used by plants is absorbed through the roots. Water leaves plants by which process?

A. infiltration B. precipitation C. runoff D. transpiration

THE DIAGRAM BELOW SHOWS A FOOD WEB

Which population would probably increase if the tadpole population decreased?

A. herons B. alligators C. fish D. algae

A FOOD WEB IS SHOWN BELOW.

Which organism in this food web is a decomposer?

A.American plum B.golden mycena C.metallic wood borer D.white-tailed deer

THE FIGURE BELOW REPRESENTS THE FLOW OF FOOD ENERGY THROUGH A SYSTEM. In an experiment, chickens were fed

grain that contained a chemical marker in its proteins. The presence of the marker can be detected in organisms.

Which of the following is the most reasonable prediction from this experiment?

A. The marker will only be found in the grain.

B. Both chickens and wolves will have the marker.

C. Wolves will have the marker, but chickens will not.

D. The marker will only be found in the animals’wastes.

The natural cycling of oxygen between organisms and their environment is most directly accomplished through which of the following pairs of processes?

A.fermentation and oxidation B.transpiration and evaporation C.precipitation and condensation D.photosynthesis and respiration

A man ran on a treadmill for 1,800

seconds. At the end of his run, the

treadmill indicated his energy output as 240,000 J. What average power did he generate?

A. 666 W B. 133 W C. 66 W D. 7 W

A solution that contains less solute than it can hold at a given temperature is

A. disassociated. B. saturated. C. supersaturated. D. unsaturated.

THE TABLE BELOW SHOWS SOME INFORMATION FOR FOUR DIFFERENT ELEMENTS.

A cube of an unknown element has a shiny, silvery color. The side of the cube measures 2.0 cm and the cube has a mass of 14.56 g.

Based on the information in the table, which element makes up the cube?

A. barium B. beryllium C. chromium D. phosphorus

THE TABLE BELOW CONTAINS DATA FOR WATER SAMPLES FROM FOUR SOURCES.

Nancy analyzed water samples from several sources: rainfall, a nearby creek, a swimming pool, and her kitchen faucet. She recorded her data in the table.

Which sample was most acidic? A. rain B. creek C. pool D. faucet

Which of the following explains why saltwater is considered a mixture?

A. It is composed of one element. B. It is composed of one compound. C. It is composed of two or more

substances and has new chemical properties.

D. It is composed of two or more substances that retain their own chemical properties.

IN THE FOLLOWING DIAGRAMS, THE SPHERES REPRESENT PARTICLES. DIFFERENT SHADINGS REPRESENT DIFFERENT PARTICLES. WHICH OF THE FOLLOWING CONTAINS ONLY ONE PURE SUBSTANCE?

Ans. C

Which of the following is an example of a physical change?

A. Iron exposed to air produces rust. B. Hydrogen combined with oxygen

forms water. C. Sulfur combined with oxygen

produces sulfur dioxide. D. Liquid nitrogen exposed to air

becomes nitrogen gas.

A SOLID CUBE WAS PUT INTO A CYLINDER CONTAINING FOUR LIQUIDS WITH DIFFERENT DENSITIES AS SHOWN BELOW.

The cube fell quickly through layer A, fell slowly through layer B, and stopped upon reaching layer C. The density of the cube most likely lies between

A. 1.00 and 1.50 g/cm3. B. 1.51 and 3.50 g/cm3. C. 3.51 and 6.00 g/cm3. D. 6.00 and 9.00 g/cm3.

A student was assigned to take water samples from a lake near his home. He measured the pH of one of the water samples to be 6.0. Which of the

following best describes this sample of water? A. highly acidic B. slightly acidic C. highly basic D. slightly basic

Which of the following groups of organisms uses sunlight to convert carbon dioxide and water into sugar and oxygen?

A. carnivores B. decomposers C. herbivores D. producers

The ocean water near the equator absorbs more heat throughout the year than ocean water near the North Pole. Which of the following best explains this difference?

A. The equator is closer to the Sun. B. The equator has higher sea

levels. C. The equator receives more

direct sunlight. D. The equator rotates more

quickly on Earth’s axis.

Which of the following is an example of a physical change but not a chemical change?

A. A log gives off heat and light as it burns.

B. A tree stores energy from the Sun in its fruit.

C. A penny lost in the grass slowly changes color.

D. A water pipe freezes and cracks on a cold night.

Which of the following is an example of the formation of a mixture?

A. rust forming on an iron nail B. sugar crystals dissolving in water

C. sodium and chlorine forming table salt

D. hydrogen and oxygen reacting to produce water

Which of the following substances can be separated into several elements?

A. nitrogen B. zinc C. air D. aluminum

Which of the following best describes a role of mushrooms in ecosystems?

A. capturing energy from sunlight B. consuming living plant material C. taking energy from animal hosts D. breaking down dead plant

material

Which of the following is a characteristic of all chemical changes?

A. A different state of matter is produced.

B. Some mass is converted to energy.

C. Some form of light is given off. D. A new material is formed.

What is the smallest unit of an element that still has the properties of that element?

A. an atom B. a compound C. an electron D. a molecule

The organism in the terrestrial food web that corresponds to the krill in the marine food web is labeled X. Which of the following organisms is most likely organism X?

ANS A

Similar structures are present in the embryos of fish, chickens, and rabbits. In fish, these structures develop into gills, but in chickens and rabbits, they either disappear or develop into other body parts later in embryonic development.

Which of the statements below best explains the presence of these structures in the embryos of all three species?

A. The embryos of the three species are similar in size.

B. Breathing structures are similar among the young of the three species.

C. The three species have a common ancestor with these embryonic structures.

D. The reproductive mechanisms are similar among the adults of the three species.

The water cycle would not occur if which of the following were missing?

A. animals B. bacteria C. ice caps D. solar energy

PART OF A TUNDRA FOOD WEB IS SHOWN BELOW. Which of the following

describes the relationship between the sedge and the arctic hare?

A. competition B. host-parasite C. mutualism D. producer-consumer

A car is parked on the side of a hill. Which of the following most likely

prevents the car from moving down the hill?

A. The car has too much mass to move easily.

B. There is friction in the door hinges of the car.

C. There is friction between the tires and the road.

D. The weight of the car is mostly on the front wheel

A cart at the top of a hill is released and rolls down the hill. Which of the following describes the energy of the cart just as it reaches the bottom of the hill?

A. The cart has no energy. B. The cart has maximum kinetic

energy. C. The cart has maximum gravitational

potential energy. D. The cart has equal gravitational

potential and kinetic energy.

Which of the following is a vector quantity?

A. mass B. force C. temperature D. kinetic energy

What is the mass of an object weighing 63 N on Earth?

A. 0.1 kg B. 6.3 kg C. 73 kg D. 617 kg

How long will it take a car to accelerate from 20 m/s to 26 m/s at a rate of 1.4 m/s2?

A. 2.2 s B. 2.7 s C. 4.3 s D. 4.6 s

A crane lifts two 100 kg loads of building materials to the top of a building under construction. The first load is lifted in 10 s and the second load is lifted in 13 s.

Which of the following statements best compares the work and power expended by the crane lifting the two loads?

A. The crane does more work and expends more power for the first lift.

B. The crane does the same work and expends the same power for each lift.

C. The crane does the same work for each lift but expends more power for the first lift.

D. The crane does more work in the second lift but expends the same power for each lift.

THE GRAPH BELOW RELATES VELOCITY TO TIME.

The graph would most likely apply to which of the following events?

A. A soccer ball that is at rest is suddenly kicked.

B. A ball is thrown upward and returns to the ground.

C. A person who is running at a constant speed decides to run faster.

D. A car traveling at a constant speed applies its brakes and comes to a stop.

A 9 kg model airplane flies horizontally at a constant speed. If the plane suddenly dives from its altitude of 50 m and levels off at 20 m, how much potential energy does it lose in the dive?

A. 450 J B. 1800 J C. 2700 J D. 9000 J

Because of this animal’s adaptations, it would be most successful at —

F competing with birds

G making its own food

H hiding from predators

J running very rapidly

Which process best shows the conversion of solar energy to chemical energy?

F Prevailing winds causing windmills to spin

G Green plants making their own food

H Uranium producing heat to make steam

J Tides generating electricity

The diagram shows physical changes that occur in the water cycle. Which of these shows condensation?

A Q B R C S D T

Which of these groups of organisms would most likely have accumulated the largest concentration of a long-lasting chemical pollutant in their bodies?

A Phytoplankton B Zooplankton C Lake trout D Gulls

A SCIENTIST HAS HYPOTHESIZED THAT THEEXISTENCE OF LIFE ON MARS IS LIKELY BECAUSE

MARS’S ATMOSPHERE IS 95% CARBON DIOXIDE. Which question is valid in testing this

hypothesis? F Do most other scientists agree with the

hypothesis? G Could abiotic processes account for the

carbon dioxide? H What is the percent of argon compared

to carbon dioxide in the Martian atmosphere?

J Have the scientist’s other predictions about Mars been validated?

What is the potential energy of the rock?

A 59,900 joules B 64,600 joules C 93,100 joules D 121,600 joules

How much work is performed when a 50 kg crate is pushed 15 m with a force of 20 N?

F 300 J G 750 J H 1,000 J J 15,000 J

Two science students discovered that the mass of a sample of acetone in an open beaker decreased within a few minutes. One student hypothesized that the acetone reacted with oxygen to form a gaseous compound that escaped. The other student believed that the acetone evaporated into the air. What should the students do to test these hypotheses?

F Combine the hypotheses so they give valid predictions of the acetone’s behavior

G Conduct a study of original papers describing the experiments leading to acetone’s discovery

H Perform an experiment that attempts to identify the gas above the open beaker

J Ask a classmate’s opinion about the chemical and physical properties of acetone

How much force is needed to accelerate a 1,300 kg car at a rate of 1.5 m/s 2?

F 867 N G 1,950 N H 8,493 N J 16,562 N

Which of these is a hypothesis that can be tested through experimentation?

F Bacterial growth increases exponentially as temperature increases.

G A fish’s ability to taste food is affected by the clarity of aquarium water.

H Tadpoles’ fear of carnivorous insect larvae increases as the tadpoles age.

J The number of times a dog wags its tail indicates how content the dog is.

Oxygen (O2) is an example of

A an alloy B a molecule C a salt D a mixture

The reason for wafting or fanning a small amount of chemical vapors toward the nose as a means to detect odors in a test tube is to —

A avoid experimental error from excessive loss of mass of reactants or products

B avoid splashing chemicals into the face of any person

C protect the respiratory tract against potentially harmful vapors

D determine the relative strength of the odor before smelling directly

Which of the following will allow measurement of a liquid’s volume with the greatest precision?

A 50 mL cylinder graduated in 1 mL increments

B100 mL cylinder graduated in 0.5 mL increments

C 100 mL cylinder graduated in 1 mL increments

D 200 mL cylinder graduated in 5 mL increments

TEN FROGS WERE PLACED IN A LARGE CONTAINER WITH THREE SECTIONS. EACH SECTION HAD EQUAL AMOUNTS OF LIGHT, SHELTER, FOOD, AND WATER. EACH SECTION WAS PAINTED A DIFFERENT COLOR: RED, GREEN, OR BLUE. DAILY OBSERVATIONS WERE MADE OF THE FROGS’ LOCATIONS FOR SIX WEEKS. THESE DATA WERE COMPILED TO PRODUCE THE FOLLOWING FROG LOCATION FREQUENCIES.RED AREA = 31%GREEN AREA = 35%BLUE AREA = 34%

Which conclusion about the frogs is supported by these data?

A Four frogs out of ten preferred the green area. B The frogs randomly moved into the colored

areas. C Most frogs tended to avoid the red area. D Most frogs preferred the color blue.

IN CENTRAL AMERICA THERE IS A TREE CALLED BULLHORN ACACIA (ACACIA CORNIGERA) THAT PROVIDES BOTH FOOD AND SHELTER TO A CERTAIN SPECIES OF ANT (PSEUDOMYRMEX FERRU GINEA). THE ANTS LIVE WITHIN THE TREE WITHOUT CAUSING IT HARM. IN FACT, THE ANTS PROTECT THE TREE BY VIGOROUSLY ATTACKING AND STINGING OTHER ANIMALS THAT TRY TO EAT IT.

This relationship is an example of — A predation B parasitism C mutualism D commensalism

WHICH OF THE FOLLOWING PIECES OF EQUIPMENT WOULD BE MOST APPROPRIATE FOR MEASURING THE VOLUME OF A MARBLE?

Ans. B

Wolves and hawks are at the same trophic level because they —

A both live on land B are both large mammals C both eat primary consumers D have similar hunting patterns

Approximately how much of the energy available in the tissues of the producer is eventually incorporated into the tissues of a secondary consumer?

A Less than 1% B Between 20% and

30% C Approximately 50% D More than 50%

Objects of the same mass but of different sizes and shapes were dropped from a given height. Their rates of free fall were measured and recorded. Which of the following is most likely the question this experiment was designed to answer? F How does height affect the force of gravity? G How does gravity affect objects of different

densities? H How do mass and weight affect falling

objects? J How do size and shape affect an object’s rate

of free fall?

Laboratory equipment is cleaned and properly stored after use primarily so that —

A chemical products can be measured and recorded as data

B time is saved in setting up the next experiment

C toxic materials can be kept in the laboratory

D the possibility of contamination in the laboratory is minimized

FOUR DIFFERENT LIVING ORGANISMS ARE SHOWN BELOW.

Which statement is true for all of the organisms shown?

(1) They carry out photosynthesis. (2) They are multicellular. (3) They contain at least one cell. (4) They are consumers

Grasses, shrubs, and trees are called producers because they make

(1) water (2) carbon dioxide (3) minerals (4) food

THE DIAGRAM BELOW SHOWS A DEER AND GREEN PLANTS

Which statement best describes the relationship

between the deer and the plants?

(1) The deer supplies food and oxygen to the green plants.

(2) The deer supplies food and carbon dioxide to the green plants.

(3) The green plants supply food and carbon dioxide to the deer.

(4) The green plants supply food and oxygen to the deer.

The picture shows an experiment designed to investigate biochemical activity in a water plant in a dark room. Over time, bubbles can be easily observed and counted as they escape from the funnel. The number of bubbles is an indicator of the rate of photosynthesis. Which of these data tables best reflects the expected results of this experiment?

ANS B

This picture indicates that the chemical represented is —

F pressurized G corrosive H flammable J toxic

The diagram above is intended to show

relationships in an ecosystem. What do the arrows represent?

F The direction of population migration

G Differences in dietary habits H Progressively smaller organisms J The direction of energy flow

In an activity, a ball is dropped from a height of 100 cm onto five different materials. The rebound height of each drop is shown in the graph. Which of the following describes the hypothesis most likely being tested?

A The mass of the ball affects the rebound height. B The material the ball is made of affects the

rebound height. C The height the ball is dropped from affects the

rebound height. D The surface the ball is dropped onto affects the

rebound height.