Key
th
7 Grade Science SCA Review
Safety and Equipment
1. What task is being performed in
the picture?
A. measuring mass with a graduated
cylinder
B. measuring length with a triple beam
balance
C. measuring mass with a triple beam
balance
D. measuring length with a metric ruler
2. A group of students is using item
II, III, and IV. What task are they
most likely completing?
A. Determining the density of a rock
sample
B. Heating 100 mL of distilled water
C. Measuring the volume and
temperature of a solution
D. Calculating the boiling point of an
acid solution
C. Measuring the volume and
temperature of a solution
3. Jerome was conducting an
experiment in which he was trying to
measure the cooling effect of water
poured on a substance. Which of the
following tools would he use to measure
the gain or loss of energy in the
substance?
A. Beaker
B. Graduated cylinder
C. Pan balance
D. Thermometer
4. In which of these activities would a
graduated cylinder be MOST useful?
A. Determining the nesting areas of bird
species living
near the school
B. Measuring the volume of an
unknown rock sample
C. Observing the heat flow that occurs
when too liquids are mixed
D. Comparing the different wing shapes
of several flying Insects
Write the correct unit of measurement next to the lab equipment below.
Length = meters
Volume = liters
Mass = grams
5. Beakers are measured in __liters________
6.Triple beam balances are measured in ___grams_________
7. Meter sticks are measured in ____meters_________
8. Graduated cylinders are measured in ____liters________
Match the equipment with the correct definition. Write the letters in the blanks beside the
word.
9.Microscope__H_____
10.Cover slip__I____
11.Beaker___D____
12.Hot Plate___G___
13.Thermometer_B_____
14.Stopwatch___F___
15.Test Tube_E_____
16.Triple beam balance__A_____
A. a piece of equipment which measures mass
B. a piece of equipment which measures
temperature
C. a piece of equipment which measures the
volume of a liquid
D. a piece of equipment which holds liquids and
solids. It has a wide mouth and a spout for
pouring.
E. a piece of equipment into which small amounts
of a liquid or solid can be placed to be
transported, heated or cooled
F. a watch with a hand or a digital readout that
can be started and stopped instantly so as to
indicate seconds or fractions of seconds
G. a plate that can retain heat in order to keep
desired materials hot.
H. an instrument for magnifying and observing
substances that our naked eye can't see
I. a thin, transparent material that prevents fluids
from touching the objective's lens
17.Graduated Cylinder___C___
Process Skills
Number
Washers
Length
(mm)
1
0
2
3
3
6
4
?
5
12
Looking at the table above, answer the following questions.
18. What is the independent variable? _________________________
19. What is the dependent variable? _________________________
20. Predict what the length would have been with 4 washers. _________________________
21. What type of graph should be made? ____________________________
22. When will the length reach 18mm? _________________________
Match the description of the graphs with the different types of graphs.
23. Line Graph__B______
A. To compare the same characteristic of different items
24. Bar Graph__A_____
B. To show change over time
C. To show parts of the whole population or percents
25. Pie Graph___C_____
Cell Theory
1. Cells are the basic building blocks of life.
2. All living things (organisms) are composed of one or more cells.
3. All cells come from other cells (pre-existing cells).
26. Complete the crossword puzzle.
1. The basic (simple, least complex) unit in living things
2. Structure made of two or more different tissues which has a specialized function
3. Group of organs that work together to do a specific task for an organism
4. A group of similar cells that make a structure and work together to do a specific job
5. A living thing composed of interdependent parts
O
1. Cell
2. Organ
3. Organ System
4. Tissue
5. Organism
O
R
G
A
N
S
Y
S
T
G
O
R
G
A
E
M
L
L
I
N
S
N
S
I
U
S
C
E
M
27. Write the words where they are correctly placed on the Levels of Cellular Organization
model below.
Organism
Organ System
Organ
Tissue
Cell
Cell Structure
28. Match the cell organelles with their correct function.
Nucleus
Lysosomes
Vacuole
Mitochondrion
Cell Wall
Cytoplasm
Cell Membrane
Chloroplast
Cell Wall: rigid structure which surrounds plant cells; provides support. (similar to skeletal structure)
Cell Membrane: surrounds the cytoplasm of plant and animal cells and allows certain things to pass
into the cell and allows certain things to leave the cell. (similar to skin)
Cytoplasm: gel-like liquid that fills the cell
Nucleus: control center of the cell; it houses chromosomes/DNA – the genetic code for organisms.
(similar to the brain)
Mitochondrion: powerhouse of the cell; it produces energy for the cell
Vacuole: Stores water (in plant cells it is much larger than in animal cells).
Lysosomes: collects and gets rid of waste
Chloroplast: plant cell’s food factory containing chlorophyll; the site of photosynthesis
29. Label the parts of the cell.
B
A
D
A.Cytoplasm
B. Cell membrane
C. Lysosome
D. Nucleus
E. Mitochondria
F. Vacuole
E
F
C
Human Body
30. Match the human body systems with their correct function.
Word Bank:
Function Response Excretory Skeletal Stimuli Circulatory Urinary Muscular
Homestasis Respiratory Reproductive Immune Equilibrium Digestive Nervous
Endocrine Integumentary
1)Excretory: RIDS THE BODY OF WASTE.
2)Skeletal: STRUCTURE,SUPPORT,PROTECTION,STORES CALCUIM
AND AIDS IN MOVEMENT.
3)Muscular: SHAPE AND AIDS IN MOVEMENT.
4)Immune: HELPS BODY STAY HEALTHY BY FIGHTING OF GERMS,
DISEASES, AND MICRO-ORGANISMS.
5)Integumentary REGULATES BODY TEMPERATURE, SENSORY RESPONSE
RIDS BODY OF WASTE AND PROTECTION.
6)Nervous: CONTROLS THINKING, SENSES AND REGULATES
HOMEOSTASIS.
7)Endocrine: SECRETES HOROMONES AND REGULATES BODY
GROWTH.
8)Reproductive: REPRODUCE/SURVIVE.
9)Respiratory: SUPPLY BODY WITH OXYGEN BY BREATHING.
10)Circulatory: MOVE MATERIAL AROUND THE BODY.
11)Digestive: BREAK DOWN FOOD AND ABSORB NUTRIENTS THE
BODY NEEDS.
12)Urinary: BALANCE FLUID LEVELS IN THE BODY.
13)Stimuli: SOMETHING CAUSING OR REGUADED AS CAUSING
A RESPONSE.
14)Function: THE ACTION FOR WHICH A PERSON OR THING IS
PARTICTARLY FITTED.
15)Response: A REACTION AS THAT OF AN ORGANISM OR A
MECHANISM, TO A SPECIFIC STIMULIS.
16)Homeostasis: REGULATION OF AN ORGANISM’S INTERNAL,LIFEMANTAINING CONDITIONS DESPITE CHANGES IN ITS
ENVIRONMENT.
17)Equilibrium: WHEN FACTORS IN AN ECOSYSTEM REMAIN IN
BALANCE.
31. Explain why a person gets a fever when they are sick. What is the person’s body trying to
accomplish?
The person’s body is trying to kill the bacteria/virus with heat.
32. Identify the system that enables an organism respond in a fight or flight situation and explain
why.
Endocrine system/ adrenaline is produced
33. How might a human react to a virus?
A. Sneeze
B. Vomit
C. Fever
D. All of the above
34. During a fever, humans sweat. What benefit does a high fever provide?
A. The high temperature reduces anxiety.
B. The high temperature kills the bacteria.
C. The high temperature helps keep the body warm during cold weather.
D. The high temperature helps the body digest food.
Biochemistry
Organic v/s Inorganic
1- ___________does not contain Carbon.
2- ___________does contain Carbon.
Tell which formulas contain carbon
3- Al2O3_______________________
4- (AlF)2_______________________
Define Physical and Chemical changes.
5- SiO2________________________
6- C6H12O6___________________
7- CH3COOH_____________
. Classify the following as PHYSICAL or CHEMICAL changes.
1. Teeth crushing a piece of food.
2. The enzyme pepsin in your stomach aids to break down complex proteins into less complex
proteins.
3. Watery substance called saliva turns starch into sugar.
4. The hydrochloric acid in the stomach helps to break down food.
5. Pancreatic juices breaking down carbohydrates, lipids, and proteins into simpler substances.
6. Swallowing food.
7. This takes place when food is chewed, churned, and churned.
8. Pancreatic juices breaking down carbohydrates, proteins, and fats.
9. Mix your food with your tongue in your mouth.
10. Food is changed into chyme, a thin watery liquid, in your stomach.
Define Mechanical and Chemical digestion.
What
ABCD-
type of digestion is taking place
Chewing a cracker________________.
Saliva breaking down cracker into molecules of Glucose_________________.
Swallowing pieces of a hamburger________________.
Pepsin(an enzyme) in the stomach breaking the hamburger into amino
acids_________________.
The diagram shows how starch (large molecule) is broken down during digestion until it is small
enough to be used and absorbed into the blood stream (glucose)
Energy Transformations that occur in Organisms:
Mechanical
Chemical
Thermal
*Food has stored energy called, __________ energy, that can be released by a chemical change or
reaction.
*When we exercise, our bodies use the sugar, which possesses chemical energy and transform it
into ___________ energy.
*__________ is energy due to motion of atoms in the body.
Now give an example of each type(energy) in an organism.
Adaptations of Internal Structures
Prove or disprove the following statement: “Birds are well adapted for flight because they have
specialized beaks for getting food”.
Fill-in the Blank
Phototropism: A plant’s response to
_______________ (light or gravity)
Geotropism: A plant’s
response to _____________
(light or gravity)
Variation and Natural Selection
The mating of parents organisms to produce a DESIRED trait in the next generation
1. Genetic Variation
2. Selective Breeding
3. Natural Selection
4. Scientific Name
Which plant adaptation would be BEST for a plant to sustain long periods without sun?
A. Large broad leaves
B. Storage of nutrients in a bulb
C. Deep roots
True or False: Crickets communicate with other crickets by chirping. Crickets that cannot make a
sound are less likely to find a mate and reproduce. For this reason, there are few crickets that cannot
make sound. This is an example of Natural Selection.
If you were a cat living in the Mojave Desert what kind of fur would you want to have? Explain your
choice.
Long/thick
Medium/thin
short/thin
Use the dichotomous key and the pictures below to answer.
Dichotomous Key for Birds
1. a. The beak is relatively long and slender ………………………………..Certhidea
b. The beak is relatively strong and thick……………………………..…..go to 2
2. a. The bottom surface of the lower beak is flat and straight…….Geospiza
b. The bottom surface of the lower beak is curved…………………..go to 3
3. a. The bottom of the upper beak has a distinct bend…Camarhynchus
b. The bottom of the upper beak is mostly flat……………………Platyspiza
Which bird is named Geospiza
A. Bird W
B. Bird X
C. Bird Y
D. Bird Z
What is the name of bird X?
A. Certhidea
B. Geospiza
C. Camarhynchus
D. Platyspiza
Ecology, Biodiversiy, and Succession
Match the words with their correct definitions. Write the letter next to the
definition below.
A. Biodiversity B. Primary Succession C. Pioneer Species
D. Secondary Succession E. Climax Community F. Ecological Succession
_F__: gradual replacement of populations in an area (how barren land changes into a
forest if left alone)
_A__: Wide variety of plants and animal species in an area
_B__: Begins in a place without any soil, or ROCK. (After a volcanic eruption)
_D___: Begins in a place that already has SOIL and was once the home of living organisms
_C__: living things that do not need soil to survive, they can survive in extreme conditions and
start the soil-building process. (Lichen and moss (primary) grass and small shrubs (secondary)
_E__: Stable stage of ecological succession; a forest; reached equilibrium
True or False: Biodiversity is good for an environment. Explain your answer
True - The greater the biodiversity is the more sustainable the environment.
Fill-in the Blank
Primary Succession takes ________(100 or 1,000) years to reach climax community
and Secondary Succession takes ________ (100 or 1,000) years to reach climax
community.
Explain what ecological succession stage a garden with weeds is in. (Hint: Primary,
Secondary, or Climax)
A garden with weeds in the secondary stage of succession because it has soil,
grass, and weeds but does not mention trees so it could not be in Climax
Community.
Matter and Energy Interactions
1. Identify the reactants (what’s needed) and the products (what’s produced) during
the process of photosynthesis.
Reactants
Products
CO2, H2O, and Radiant Energy
C6H12O6 and O2
2. True or False: All energy on Earth originates from the sun.
True
3. Explain the energy transformation that occurs during photosynthesis.
Light or Radiant energy is transformed into chemical energy
4. Illustrate an energy pyramid that depicts the amount of energy available at each
trophic level.
Answers will vary
Using the food web below, explain what the result would be if the jackal population were to
become extinct.
Using the Food Web above, identify the following:
Producers: Green plant producer
Primary Consumers: Mouse, rabbit, goat
Secondary Consumers:_Snake, Wild Cat, Jackal Tertiary Consumers: Kite and Lion
Which of the following is NOT an example of Biomass?
A. Wood
B. Manure
C. Garbage
D. Glass
Explain the importance of the decaying of biomass and how it is beneficial for the sustainability
of an ecosystem.
Answers will vary, but answers should contain something about cycling nutrients back
to the soil so that plants will be able to use them to grow and provide food for
consumers.
Physics
A force is a push or a pull on an object. It is measured in Newtons. Force is calculated
using the formula of F (force) = M (mass) X Accleration or F= m x a
Let’s try some examples:
How much force must be applied to a toy car that has a mass of 25kg to achieve an
acceleration of 2.0 m/s2? 50 Newtons
1. If a 450 kg car is traveling westward with an acceleration of 10 m/s 2, how
much force is acting on it? 4500 Newtons
2. I am a roller skater with a mass of 70kg. If I am accelerating toward a wall
at 4.0m/s2, what will be the amount of force at which I hit the wall?
28 Newtons
3. A dock worker needs to stop a box of goods that is rolling across a manual
conveyer belt. The box has a mass of 8.0 kg and is accelerating at 5.0 m/s 2.
How much force will he need to apply to the box in order to stop it?
40 Newtons
4. How much force must be applied to move a 6 kg ice skater to an
acceleration of 10 m/s2? 60 Newtons