7-1.4 What would be the best procedure to make sure experimental
results are valid?
A. test two different variables
B. introduce bias
C. choose two different hypotheses
D. conduct more than one trial
1
7-1.1 Sean needs to measure exactly 150 mL of water for an
investigation. Which of the following tools should he choose to
correctly measure the water?
A. test tube
B. graduated cylinder
C. balance
D. beaker
2
7-1.2 Choose the question that can be answered through scientific
investigation.
A. Does a turtle or a snail make the best pet?
B. Why do plants grow most during the summer
C. What factors affect earthworm behavior?
D. Which tastes better, chocolate or vanilla ice cream?
3
Answer
D. conduct more than one trial
1a
Answer
B. graduated cylinder
2a
Answer
C. What factors affect earthworm behavior?
3a
7-1.3 A student wants to conduct an investigation to see what
factors affect earthworm behavior. What should he do to ensure
the most reliable results?
A. Test different types of earthworms at the same time.
B. Test the effects of water damp soil first, then test the effects of light.
C. Test the effects of damp soil and light at the same time.
D. Test the effects of damp soil, light, and several types of worms at
the same time.
4
7-1.4 A student wants to find out how long it would take for 0.5L of
salt water to boil. What should he do in order to obtain the most
reliable results?
A.
B.
C.
D.
one trial
two trials and take the average of both
three trials and throw out the trial with the least time
three trials and take the average of all three of them
5
7-1.6 Occasionally scientists misinterpret data, causing them to
come to the wrong conclusion. Which of the following is a common
cause of scientific misinterpretation?
A. too much data
B. unit conversion
C. researcher bias
D. not enough trials
6
Answer
B. Test the effects of water damp soil first, then test the effects of light.
4a
Answer
D. three trials and take the average of all three of them
5a
Answer
C. researcher bias
6a
7-1.7 Sam wants to heat a liquid in a test tube. What safety
precaution should he follow?
A. Turn the heat source on high.
B. Point the opening of the test tube away from himself and others.
C. Let the liquid boil until nothing is left in the test tube.
D. Look directly into the top of the test tube to see if the liquid is
boiling.
7
7-1.7 You teacher has provided samples of some unknown
substances for you to observe. What is the proper method for
smelling the substances?
A. Hold the substance directly under your nose.
B. Wave the container back and forth under your nose.
C. Use your hand to wave the fumes towards you.
D. Have someone else smell it for you.
8
7-2.1 Which of the following best describes the function of
mitochondria?
A. Encloses, supports, and protects the cell
B. Uses light energy to produce sugar
C. Stores water and waste products
D. Breaks down food and releases energy
9
Answer
B. point the opening of the test tube away from himself and others
7a
Answer
C. Use your hand to wave the fumes towards you.
8a
Answer
D. Breaks down food and releases energy
9a
7-2.1 Which structure surrounds and protects cells and provides
support in plants?
A. cell wall
B. mitochondria
C. cell membrane
D. nucleus
10
7-2.2 Which plant cell structure is involved in photosynthesis?
A.
B.
C.
D.
cell wall
cell membrane
ribosomes
chloroplasts
11
7-2.2 Which of the following organelles is found in both plant and
animal cells?
A. cell wall
B. mitochondria
C. chloroplasts
D. vacuole
12
Answer
A. cell wall
10a
Answer
D. chloroplasts
11a
Answer
B. mitochondria
12a
7-2.3 Which of the following best describes the function of cilia in
protists?
A.
B.
C.
D.
movement
digestion
reproduction
fighting disease
13
7-2.3 Bacteria are classified by their shape. Sphere shaped bacteria
are called ___________.
A.
B.
C.
D.
cocci
bacilli
chordata
spirilla
14
7-2.4 Which word illustrates the reactions that occur in the cell to
break down food and release energy?
A.
B.
C.
D.
respiration
fermentation
reproduction
transportation
15
Answer
A. movement
13a
Answer
A. cocci
14a
Answer
A. respiration
15a
7-2.4 During the process of photosynthesis, plants use light energy
to make _______________, which can be used as food.
A.
B.
C.
D.
proteins
sugars
chlorophyll
carbon dioxide
16
7-2.5 Sue has blonde hair, but her children all have brown hair.
This means that her children ___________________________.
A. do not have an allele for blonde hair.
B. have two alleles for blonde hair.
C. have one allele for blonde hair.
D. may or may not have an allele for blonde hair.
17
7-2.6 The Punnett square below shows that a mouse with black fur
mated with a mouse with white fur. Black fur is dominant over
white fur. What is the probability that one of the offspring mice
B
B
will have black fur?
A. 25%
b
B. 50%
C. 75%
b
D. 100%
18
Answer
B.
sugars
16a
Answer
D. may or may not have an allele for blonde hair.
17a
Answer
D. 100%
18a
7-2.7 Shawn is good at sports. We can infer that this is true
because _____________________.
A. he learned how to play sports.
B. he inherited the ability to be good at sports from his parents.
C. both A and B
D. neither A nor B
19
7-2.7 Over time, some wolves have become dogs that have been
domesticated. This change from wolf to dog came about through
__________.
A. genetic mutation
B. inherited traits
C. environmental factors
D. none of the above
20
7-3.1 The kidneys, ureters, bladder, and urethra are all components
of the ____________________ system.
A. respiratory
B. excretory
C. immune
D. circulatory
21
Answer
C. both A and B
19a
Answer
C. environmental factors
20a
Answer
B. excretory
21a
7-3.1 Look at the flow chart below. Which organ is missing?
Mouth > Esophagus > _______ > Small > Large > Rectum > Anus
Intestines
A. spleen
B. stomach
C. gall bladder
D. kidney
22
7-3.2 Your bones make up the skeletal system in your body. Which
of the following is a function of the skeletal system?
A. provides support for your body
B. carries impulses to your brain
C. breaks down food mechanically
D. exchanges oxygen and carbon dioxide in your blood
23
7-3.2 Which of the following contains only organs of the circulatory
system?
A.
B.
C.
D.
aorta, veins, heart
heart, blood vessels, nerves
esophagus, stomach, veins
kinder, bladder, heart
24
Answer
B. stomach
22a
Answer
A. provides support for your body
23a
Answer
A. aorta, veins, heart
24a
7-3.3 The skin, _________, _________, and ___________ make up
the excretory system.
A. digestive, respiratory, and urinary
B. circulatory, skeletal, and muscular
C. urinary, digestive, and circulatory
D. respiratory, skeletal, and muscular
25
7-3.4 Which of the following is known as an infectious disease?
A. allergies
B. diabetes
C. asthma
D. chicken pox
26
7-4.1 An earthworm’s ________ is in the soil.
A. biome
B. ecosystem
C. habitat
D. niche
27
Answer
A. digestive, respiratory, and urinary
25a
Answer
D. chicken pox
26a
Answer
C. habitat
27a
7-4.1 Which of the following lists the levels of organization of the
living world from largest to smallest.
A.
B.
C.
D.
biome, ecosystem, community, population, organism
community, population, biome, ecosystem, organism
organism, biome, population, community, ecosystem
ecosystem, population, community, organism, biome
28
7-4.2 Which member of the food chain below receives the least
amount of energy per food source?
Grass > grasshopper > sparrow > owl
A. grasshopper
B. sparrow
C. owl
D. grass
29
7-4.2 Producers in the energy pyramid receive the energy they need
to reproduce and grow from the _______.
A.
B.
C.
D.
sunlight
prey
rainwater
other producers
30
Answer
A. biome, ecosystem, community, population, organism
28a
Answer
C. owl
29a
Answer
A. sunlight
30a
7-4.3 In ecosystem, the extinction of a particular carnivore led to
the extinction of a fruiting plant. What is the best explanation for
this?
A. A change in any system has predictable results.
B. A change in any system has unpredictable results.
C. The species within a system are not connected.
D. A change in any system may have unpredictable results.
31
7-4.3 Occasionally a population does not grow to its biotic potential
due to environmental conditions. This is called ______________.
A.
B.
C.
D.
symbiosis
homeostasis
limiting factors
carrying capacity
32
7-4.4 An herbicide is sprayed on the soil in a wooded area represented by
the food chain below. Most of the plant material in the area died. Which of
the following is likely to be an outcome due to the spraying of the herbicide?
Grasses & plants > mice > snakes, foxes, & hawks
A. fewer mice
B. fewer foxes
C. fewer snakes
D. fewer, mice, snakes, & foxes
33
Answer
D. A change in any system may have unpredictable results.
31a
Answer
C. limiting factors
32a
Answer
D. fewer, mice, snakes, & foxes
33a
7-4.4 Which of the following practices is harmful to the
environment?
A. land conservation
B. select-cutting of trees
C. deforestation
D. monitoring water and soil quality
34
7-4.4 Which of the following farming practice that will renew the
nutrients in the soil?
A. rotate crops and fields each year
B. grow the same crop in the same field every year
C. thoroughly plow the soil
D. do not add any fertilizer or compost to the soil
35
7-4.5 A factory dumped raw sewage into nearby river. As a result,
many of the fish in the river we poisoned. The decrease in the fish
population may directly effect the _______ population in the area.
A. fewer mice
B. fewer spiders
C. fewer birds
D. fewer insects
36
Answer
C. deforestation
34a
Answer
A. rotate crops and fields each year
35a
Answer
C. fewer birds
36a
7-4.5 Which of the following is the main source or irrigation in this
country?
A. the polar ice cap
B. the Atlantic & Pacific Oceans
C. rainwater
D. groundwater
37
7-4.5 What would happen if an area experienced an extreme
drought resulting in the lowering of the water table near an ocean?
A. The lowered water table may cause sink holes.
B. The lowered water tabled may draw water from nearby water tables
and deplete the freshwater supply.
C. The lowered water table may allow saltwater from the ocean to
contaminate the water supply.
D. The lowered water table may make the bedrock more permeable
further lowering the water table.
38
7-4.6 Water, crops, and sunlight are examples of ______________.
A. nonrenewable resources
B. renewable resources
C. recycling materials
D. reusing materials
39
Answer
D. groundwater
37a
37a
Answer
C. The lowered water table may allow saltwater from the ocean to
contaminate the water supply.
38a
Answer
B. renewable resources
39a
7-4.6 Which of the following strategies might reduce our
dependence on fossil fuels?
A. selling gas that have fewer miles per gallon
B. recycling materials made of plastic
C. increase the cost of public transportation
D. reducing the use of CFC’s
40
7-4.6 Petroleum is a nonrenewable resource because ____________.
A. it is found in areas of political unrest.
B. it takes millions of years to form.
C. it can be replaced faster than it is used.
D. can never be completely consumed by human activity.
41
7-5.1 What particle or particles make up the nucleus of an atom?
A. protons only
B. neutrons only
C. protons and neutrons
D. protons and electrons
42
Answer
B. recycling materials made of plastic
40a
Answer
B. it takes millions of years to form.
41a
Answer
C. protons and neutrons
42a
7-5.2 Bran cereal with raisins is an example of a ______________.
A. solution
B. mixture
C. element
D. compound
42
7-5.2 Which of the following is an element?
A. hydrogen
B. steel
C. orange juice
D. table salt
43
7-5.2 Which of the following is a compound?
A. oxygen
B. steel
C. silver
D. table salt
44
Answer
B. mixture
42a
Answer
A. hydrogen
43a
Answer
D. table salt
44a
7-5.3 Which property of metal makes it a good choice for making
jewelry?
A. solubility
B. malleability
C. ductility
D. conductivity
45
7-5.3 Which of the following properties makes metal a good choice
for cooking utensils?
A. high melting point
B. high density
C. shiny surface
D. reactivity with water
46
7-5.3 Which of the following is a property of a nonmetal?
A. hard, shiny surface
B. good conductor of heat
C. poor conductor of electricity
D. can be bent into different shapes
47
Answer
C. ductility
45a
Answer
A. high melting point
46a
Answer
C. poor conductor of electricity
47a
7-5.5 Which of the following is the correct chemical symbol of table
salt?
A. NCl
B. NaCl
C. 2NaC
D. NaCl2
48
7-5.5 What is the name of the compound CO2?
A. carbononate oxygen
B. carbon dioxide
C. dioxide bicarbonate
D. dioxygen carbon
49
7-5.5 How many atoms are present in one molecule of C6H12O6?
A. 1
B. 6
C. 12
D. 24
50
Answer
B. NaCl
48a
Answer
B. carbon dioxide
49a
Answer
D. 24
50a
7-5.6 A(n) __________ is a substance that produces H+ ions in
water.
A. acid
B. base
C. salt
D. alcohol
51
7-5.6 An indicator is used to determine the ________ of a solution.
A. solubility
B. temperature
C. boiling point
D. pH
52
7-5.6 A(n) ______________ is a substance that produces OH- ions in
water.
A. acid
B. base
C. salt
D. alcohol
53
Answer
A. acid
51a
Answer
D. pH
52a
Answer
B. base
53a
7-5.7 The chemical equation below represents the reaction between
baking soda and vinegar. What are the reactants in this equation?
CH3COOH + NaHCO3 > CH3COONa + H2O + CO2
Vinegar
Baking
Sodium
Water Carbon
Soda
Acetate
Dioxide
A. vinegar and baking soda
B. vinegar and sodium acetate
C. baking soda and carbon dioxide
D. sodium acetate and water
54
7-5.7 The statement below represents the reaction that happens
when silver tarnishes. What are the products in this equation?
Silver + hydrogen sulfide > silver sulfide + hydrogen
A. silver and hydrogen sulfide
B. hydrogen sulfide and silver sulfide
C. silver and hydrogen
D. silver sulfide and hydrogen
55
7-5.8 The number of atoms of an element at the beginning of a
chemical reaction must equal the same number of atoms at the end
of a chemical reaction. This law is called ____________________.
A. gravity
B. work
C. conservation of matter
D. conservation of energy
56
Answer
A. vinegar and baking soda
54a
Answer
D. silver sulfide and hydrogen
55a
Answer
C. conservation of matter
56a
7-5.9 Density is a physical property that compares an objects mass
to its volume. Which formula best describes density?
A. Density = Mass / Volume
B. Density = Volume / Mass
C. Density = mass x volume
D. Density = mass – volume
57
7-5.9 A tangerine can be describes as round, orange colored, sweet
tasting, and rough skinned. These are all __________________.
A.
B.
C.
D.
physical changes
chemical changes
physical properties
chemical properties
58
7-5.10 When paper is burned it leaves ash in its place. This is a
_________________________.
A. physical change
B. chemical change
C. physical property
D. chemical property
5859
Answer
A. Density = Mass / Volume
57a
Answer
C. physical properties
58a
Answer
B. chemical change
59a