BELLWORK8th 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, 2013The 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, 2013A 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, 2013The 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?

A. Long necks and tall legsB. Large shell and leathery skin

C. Light colored fur and layers of blubberD. Brightly colored feathers and webbed feet

CAMOUFLAGE TEMPERATURE

pelican

August 19, 2013-MondayCan blueberries slow down aging? A study indicates that antioxidants found in blueberries

may slow down the process of aging. In this study, 19-month 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

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 %

The table below shows the percentage of individuals in a population of insects that are resistant to certain types of insecticides

Which two populations would be most affected by a widespread use of insecticide 2?

Delta dried up…

August 21, 2013-Wednesday

1. 3.2. 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 plantB. The amount of sunlight

C. The volume of waterD. The amount of nutrients

Humpback washed ashore

August 23, 2013-FridayThe 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 speed-

reading. 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 -Thursday1. 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 cmB. Mass = 11 grams and Volume = 4 cubic cmC. Mass = 10 grams and Volume = 12 cubic cmD. 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 -WednesdayBeta-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 experimentB. Asking a questionC. Drawing a conclusionD. 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 useB. Test each dam model during a different flood seasonC. Analyze the dam designs and choose oneD. 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 -Monday1. What is the INTENDED benefit of the cell

phone?A. New cell phone towers

B. To create new jobsC. To look cool in public

D. Convenient way to communicate

2. What is a negative UNINTENDED consequence of cell phones?

A. New jobs are createdB. Too easy to stay connected

C. Noise pollutionD. 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 hypothesisb. Ask a Question, Test the Hypothesis, Form a Hypothesis

c. Form a Hypothesis, Analyze the Results, Test the Hypothesisd. 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

A

B

C

D

E

1. What is the relative age of layer C?

2. Which layer is the most recent layer?

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 -TuesdayThe 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 erosionD. Improved habitat for wildlife

November 9, 2012 -FridayThe 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

Using the following density column, answer the following questions.

1. Which liquid is the most dense?

2. Which liquid is the least dens?

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?

A

B

C

D

E

November 14, 2012 -WednesdayMillimeters 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 1500Which is the best conclusion based on the data?

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 weather-forecasting 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 -TuesdayA student observes actions that occurred

in four different eggs. Which of the following action describes only a

chemical change?

A. A cut eggB. A stirred eggC. A rotting egg

D. A dropped egg

November 30, 2012-Friday

8. An engineering company is testing a new weather-forecasting 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

Using the following geologic column, answer the following questions.

1. Which layer is the oldest?

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?

A

B

C

D

E

December 10, 2012 --Monday

1 4

2

3

5

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 -Wednesday1. What is the name for placing things into groups

based on similar characteristics?A. Grouping

B. ClassificationC. StudyingD. Listening

2. Who is given credit with developing a scientifically organized system to classify organisms?

A. DarwinB. AristotleC. LinneousD. 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