BELLWORK
8th grade
2013-2014
Snake ate deer
August 12, 2013
Which process is an
example of a physical
change?
(1) wood burning
(2) ice melting
(3) iron rusting
(4) milk souring
Taste bud
August 13, 2013
The diagram shows a
food web for a
community.
Which organisms in the
diagram are
carnivores?
(1) rabbits and birds
(2) grasshoppers and
mice
(3) carrots and grasses
(4) foxes and owls
Goat with artificial heart
August 14, 2013
A group of educators wants to determine whether students
that eat a regular breakfast everyday perform better in school.
Therefore, the teachers survey students each day on whether
they ate breakfast or not. The teachers record their findings
for an entire grading period. At the end of the grading period,
the teachers compare the grades of the students that ate a
regular breakfast to the grades of the students that did not eat
a regular breakfast.
• What is the control group?
• What is the experimental
group?
ant
August 15, 2013
Mabel wants to determine if Energizer
batteries last longer in a Wii remote
than Duracell batteries.
1. What is the independent variable?
2. What is the dependant variable?
3. Is there going to be a control
group
EAR???
August 16, 2013
The Arctic environment has temperatures that
range between -22 and 6 degrees C with
snow covering some of the area. Which
adaptation would most likely help a
population of organisms survive this
environment?
CAMOUFLAGE
TEMPERATURE
A. Long necks and tall legs
B. Large shell and leathery skin
C. Light colored fur and layers of blubber
D. Brightly colored feathers and webbed feet
pelican
August 19, 2013-Monday
Can blueberries slow down aging?
A study indicates that antioxidants found in blueberries
may slow down the process of aging. In this study, 19month old rats (equivalent to 60-year old humans)
were fed either their standard diet or a diet
supplemented by blueberries. After eight weeks, the
rats were given memory and motor tests.
1. What is the independent variable?
2. What is the dependent variable?
3. What is the control group?
4. What is the experimental group?
Coral worm
August
20,
2013-Tuesday
The table below shows the percentage of individuals in a population of insects
that are resistant to certain types of insecticides
Population
Insecticide 1 Insecticide 2 Insecticide 3
1
12.8 %
48.5 %
1.8 %
2
52.5 %
2%
9.3 %
3
28.6 %
9.2 %
34.8 %
4
0%
0%
10.1 %
5
2.8 %
66.6 %
3.5 %
6
3.6 %
78.5 %
48.2 %
Which two populations would be most affected
by a widespread use of insecticide 2?
Delta dried up…
August 21, 2013-Wednesday
1.
2.
3.
4.
5.
Space shuttle Endeavor
August 22, 2013-Thursday
Katie wants to learn about the effect that
different amounts of sunlight have on
plants. Which of the following is the
only variable that she should change?
A. The type of plant
B. The amount of sunlight
C. The volume of water
D. The amount of nutrients
Humpback washed ashore
August 23, 2013-Friday
The football team and the baseball team both
compete in the geography bee. Both teams
are composed of 5 boys of the same grades
and are quizzed over the same material.
However the boys on the football team are
provided the questions one week prior to the
geography bee.
1. Is there bias?
2. What is the bias?
3. What could we change so
bias would not be present?
Fertilization
September 3, 2013 -Tuesday
A group of college students were given a short course in speedreading. The instructor was curious if a monetary incentive
would influence performance on a reading test taken at the end
of the course. Half the students were offered $5 for obtaining a
certain level of performance on the test, the other half were not
offered money.
1. Independent variable:
2. Dependent variable:
3. Experimental group:
4. Control group:
Iceberg in Antarctica
September 5, 2013 -Thursday
1. A student designs an experiment to
determine how surface type affects the
amount of force needed to roll a ball 20
meters. What is the independent
variable?
A. The lengths of the surface
B. The force needed to roll the ball
C. The type of surfaces used
D. The type of ball chosen
Crater Lake thunderstorm
September 6, 2013-Friday
Which two items are BEST to use to
determine the combined volume of
three small rocks? Why?
A. Electric scale and ruler
B. Graduated cylinder and water
C. Hot plate and beaker
D. Meter stick and eye dropper
Transylvania petroleum
September 9, 2013-Monday
10.Which block has the greatest density?
A. Mass = 9 grams and Volume = 9 cubic cm
B. Mass = 11 grams and Volume = 4 cubic cm
C. Mass = 10 grams and Volume = 12 cubic cm
D. Mass = 12 grams and Volume = 15 cubic cm
WHO is IT?
September 10, 2013 -Tuesday
4. Which of the following accurately describes
what scientists mean by a controlled
experiment?
A. The outcome is controlled.
B. One variable remains fixed while other
variables are changed.
C. One variable changes throughout the
experiment while all other variables
remain fixed.
D. None of the above
VOLCANO
September 11, 2013 -Wednesday
Beta-carotene supplements have been
thought to protect against cancer. A study
was conducted with 39,000 women aged
45 and up. These women were randomly
assigned to receive a beta-carotene
supplement or a placebo, and their health
was studied over their lifetime. Cancer
rates for women taking the beta-carotene
supplement did not differ systematically
from the cancer rates of those women
taking the placebo.
1. What is the independent variable?
2. What is the dependent variable?
SEAHORSES
September 12, 2013 -Thursday
What is the first step in a scientific
investigation?
A. Conducting an experiment
B. Asking a question
C. Drawing a conclusion
D. Making a prediction
SHAKE IT OUT!!
September 16, 2013 -Monday
An automobile manufacturer
wants to know how bright brake
lights should be in order to
minimize the time required for
the driver of a following car to
realize that the car in front is
stopping and to hit the brakes.
1.What is the independent
variable?
2.What is the dependent variable?
September 17, 2013-Tuesday
12. What is the density of the cube if it has a
mass of 2 grams and a volume of 1 cubic cm?
A. 3.0 grams/cubic cm
B. 2.0 grams/cubic cm
C. 1.0 grams/cubic cm
D. 0.5 grams/cubic cm
September 18, 2013 -Wednesday
In order to prolong the shelf life of fruits and
vegetables, companies expose some types of
fruits and vegetables to x-rays in order to kill
bacteria. Which best describes irradiated fruits
and vegetables?
A. Adaptive products
B. Assistive products
C. Synthetic products
D. Natural products
September 19, 2013-Thursday
9. A company is designing a dam with a floodgate to keep
houses safe during the rainy season. The company is
reviewing several designs that have worked in the past and
is trying to develop a plan for implementing one design.
Which is t he next step in this process?
A. Pick several different dams to use
B. Test each dam model during a different flood season
C. Analyze the dam designs and choose one
D. Redesign the past dams based on what the company feels
September 20, 2013-Friday
13. The main biofuel on the market today is
ethanol, a fuel made from corn. Which
type of bioengineered product is ethanol?
A. Adaptive
B. Assistive
C. Resistant
D. Manipulated
September 23, 2013 -Monday
1. What is the INTENDED benefit of the cell
phone?
A. New cell phone towers
B. To create new jobs
C. To look cool in public
D. Convenient way to communicate
2. What is a negative UNINTENDED consequence
of cell phones?
A. New jobs are created
B. Too easy to stay connected
C. Noise pollution
D. Convenient communication
September 24, 2013 -Tuesday
List the 3 kinds of
scientific models
September 25, 2013 -Wednesday
1. What is the IV?
2. What is the DV?
September 26, 2013 -Thursday
What is
the
volume
of the
apple?
September 27, 2013 -Friday
Which of the following lists the given steps of the scientific method in
the correct order?
a.
Analyze data, Draw Conclusions, Form a hypothesis
b.
Ask a Question, Test the Hypothesis, Form a Hypothesis
c.
Form a Hypothesis, Analyze the Results, Test the Hypothesis
d.
Ask a Question, Form a Hypothesis, Test the Hypothesis
September 30, 2013 -Monday
October 1, 2013 -Tuesday
October 2, 2013 -Wednesday
October 3, 2013 -Thursday
October 4, 2013 -Friday
November 2, 2012-Friday
1. What is the relative age of layer C?
2. Which layer is the most recent layer?
A
B
C
D
E
November 5, 2012 -Monday
1. List the organisms with Claws or Nails but no fur.
2. Which organisms have lungs but DO NOT have
feathers?
November 6, 2012 -Tuesday
The clearing of rain forests for
agricultural use has led to a decrease
in biodiversity in many areas. One
potential consequence of deforestation
is
A. An increase in the amount of atmospheric
oxygen
B. The loss of plants with potential medicinal
uses
C. A decrease in soil erosion
D. Improved habitat for wildlife
November 9, 2012 -Friday
The artic environment has a temperature that
ranges between –22oC and 6oC with snow
covering some of the area. Which adaptation
would most likely help a population of
organisms survive this environment? Why?
A. Long necks and tall legs
B. Large shells and leathery skin
C. Light colored fur and layers of blubber
D. Brightly colored feathers and webbed feet
November 12, 2012 -Monday
A
Using the following density
column, answer the following
questions.
B
1. Which liquid is the most
dense?
C
2. Which liquid is the least
dens?
D
E
3. If the density of liquid C is
1.00g/cm3, then what does
the density of liquid D have
to be, relative to C?
November 14, 2012 -Wednesday
Millimeters of rain
Number of grazing
animals
1975
780
1500
1980
525
2000
1985
600
1500
1990
575
2500
1995
300
1500
2000
850
1000
2005
300
Which is the best conclusion based on the data?
1500
A. The number of grazing animals increases approximately every 5 years
B. The number of grazing animals supported by rainfall cannot exceed 2000
C. The amount of rainfall does not affect the number of grazing animals in the
area
D. The amount of available food increases after years of increased rainfall.
November 13, 2012 -Thursday
The clearing of rainforests for agricultural use has
led to a decrease in biodiversity in many areas.
One potential consequence of deforestation is
A. An increase in the amount of atmospheric
oxygen
B. The loss of plants with potential medicinal uses
C. A decrease in soil erosion
D. Improved habitat for wildlife
November 20, 2010-Tuesday
8. An engineering company is testing a new weatherforecasting program. Which procedure would best
verify that the program is making accurate predictions?
A. Comparing the predictions of the program to the actual
weather
B. Comparing the predictions of the program to other
predictions
C. Using the program to verify events not related to
weather
D. Using the program to verify past weather-related events
November 27, 2012 -Tuesday
A student observes actions that occurred in
four different eggs. Which of the
following action describes only a
chemical change?
A. A cut egg
B. A stirred egg
C. A rotting egg
D. A dropped egg
November 30, 2012-Friday
8. An engineering company is testing a new weatherforecasting program. Which procedure would best
verify that the program is making accurate predictions?
A. Comparing the predictions of the program to the actual
weather
B. Comparing the predictions of the program to other
predictions
C. Using the program to verify events not related to
weather
D. Using the program to verify past weather-related events
November 30, 2010-Friday
11.Which statement BEST describes the difference
between a mixture and a compound?
A. Compounds are pure elements
B. Compounds contain elements bonded together
C. Compounds can be easily separated into distinct
parts
D. Compounds have multiple boiling points
December 7, 2012 -Friday
A
Using the following geologic
column, answer the following
questions.
1. Which layer is the oldest?
B
C
D
E
2. Use relative dating and
compare layers A and C?
3. What likely happened to the
heart shaped organisms when
the lightning organisms began
to share their habitat? How
do you know?
December 10, 2012 --Monday
4
1
5
2
3
6
Compare the fossil layers shown above.
Which organisms are likely to be the same approximate
age?
A. 2 and 4
B. 2 and 5
C. 1 and 5
D. 5 and 6
December 11, 2012 -Tuesday
Which of the following best describes
particles of a liquid?
A. The particles are far apart and moving fast.
B. The particles are close together but moving past
each other.
C. The particles are far apart and moving slowly.
D. The particles are closely packed and vibrating in
place.
December 12, 2012 -Wednesday
1. What is the name for placing things into groups
based on similar characteristics?
A. Grouping
B. Classification
C. Studying
D. Listening
2. Who is given credit with developing a scientifically
organized system to classify organisms?
A. Darwin
B. Aristotle
C. Linneous
D. Einstein
December 13, 2012 -Thursday
2. The genus name of the rose Ryan is looking
for is rosa. Its specific name is alba. What
will it say on the tag identifying the plant?
A. alba rosa
B. Alba rosa
C. Rosa alba
D. rosa alba
December 18, 2012 -Tuesday
A beach, a cloud, and the air we
breathe are examples of
A.Interaction of elements
B.Distillation
C.Physical properties
D.Mixtures occurring in nature