Scientific Method Fun

An experiment was carried out to determine whether drinking caffeinated soda increases pulse rate. The pulse rates of two groups of people at rest were measured. Group A was then given caffeinated soda and group B was given caffeine-free soda. One hour after drinking the soda, the pulse rates were measured. The participants in the experiment were all the same age, and they were all given the same amount of soda.

What is the dependent variable in this experiment?

• type of soda given to each group

• amount of soda given to each group

• pulse rate of each group

• age of participants in each group

An experiment was carried out to determine whether drinking caffeinated soda increases pulse rate. The pulse rates of two groups of people at rest were measured. Group A was then given caffeinated soda and group B was given caffeine-free soda. One hour after drinking the soda, the pulse rates were measured. The participants in the experiment were all the same age, and they were all given the same amount of soda.

What is the independent variable in this experiment?

• type of soda given to each group

• amount of soda given to each group

• pulse rate of each group

• age of participants in each group

When a test tube of water containing elodea (an aquatic plant) is placed near a bright light, the plant gives off gas bubbles. When the light is placed at different distances from the plant, the rate of bubbling is affected. The independent variable in this demonstration is the

• concentration of gas in the water

• type of aquatic plant in the test tube

• amount of water in the test tube

• distance of the plant from the light

Tags

NGSS.MS-LS1-6

NGSS.MS-LS1-7

When a test tube of water containing elodea (an aquatic plant) is placed near a bright light, the plant gives off gas bubbles. When the light is placed at different distances from the plant, the rate of bubbling is affected. The dependent variable in this demonstration is the

• concentration of gas in the water

• type of aquatic plant in the test tube

• amount of water in the test tube

• distance of the plant from the light

Tags

NGSS.MS-LS2-1

The bar graph below shows the height of a plant at the end of each week of a five The bar graph below shows the height of a plant at the end of each week of a five-week growth period.

Which statement represents a valid conclusion based on the information in the graph?

• The plant was given water during the first three weeks, only.

• The plant will grow faster during the sixth week than it did during the fifth week

• The plant grew fastest during the first three weeks, and then it grew slower.

• The plant grew slowest during the first three weeks, and then it grew faster.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

The table below shows an effect of secondhand smoke on the birth weight of babies born to husbands and wives living together during pregnancy.

Based on these data, a reasonable conclusion that can be drawn about secondhand smoke during pregnancy is that secondhand smoke

• is unable to pass from the mother to the fetus

• slows the growth of the fetus

• causes mutations in cells of the ovaries

• blocks the receptors on antibody cells

Tags

NGSS.MS-LS1-5

Dependent variable associated with

• what is tested

• what is measured

• data collected

• Both 2 & 3

Tags

NGSS.MS-PS1-2

NGSS.MS-PS2-2

Elmo wants to see if gatorade helps plants grow tall. What should be used as the control in his experiment?

• Milk

• No liquid

• Water

• Gatorade

Tags

NGSS.MS-ETS1-1

The independent variable is always located on the

• x axis

• y axis

Tags

NGSS.MS-PS3-1

All good graphs need

• a title

• labeled axis

• an appropriate scale

• all of the above

Tags

NGSS.MS-PS3-1