IV/DV Extra Practice

Sally waters her hydrangeas with spring water, tap water and distilled water and counts the number of flower petals. The IV is

• the type of water

• how much light they get

• the number of petals

• the variety of hydrangea

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

In the greenhouse, students keep trees at 3 different humidity levels. They are left there for 3 years. One tree is left outside in normal conditions. The heights of the trees are measured once a week.

What is the control in this experiment?

• the humidity level

• the time they are left in the greenhouse

• the number of times they are measured

• the tree outside

In the greenhouse, students keep trees at 3 different humidity levels. They are left there for 3 years. One tree is left outside in normal conditions. The heights of the trees are measured once a week.

What is the dependent variable?

• the type of tree

• the height of the tree

• the humidity levels

• how long the trees are left in the greenhouse

Tags

NGSS.MS-LS1-5

Green pea plants are given different amounts of water for a three-week period. First pea plant receives 400 milliliters. Second pea plant receives 200 milliliters. Third pea plant receives 100 milliliters. Fourth pea plant does not receive any extra water; the plant only receives natural ways of receiving water. The height of the pea plants is recorded daily.

What is the independent variable?

• the amount of water

• the type of plant

• the plant with only nature ways of receiving water

• the height of the plants

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

One tank of goldfish is fed the normal amount, which is once a day; a second tank is fed twice a day; and a third tank is fed four times a day during a six-week study. The fishes’ body fat is recorded daily.

What is the dependent variable?

• how many times the fish are fed

• the temperature of the water

• the size of the tank

• the fishes' body fat

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

You decide to clean the bathroom. You notice that the shower is covered in a strange green slime. You decide to try to get rid of this slime by adding lemon juice. You spray half of the shower with lemon juice and spray the other half of the shower with water. After 3 days of “treatment”, there is no change in the appearance of the green slime on either side of the shower.

What is the independent variable?

• the spray used (lemon juice or water)

• the appearance of the slime on the shower

• the number of times you spray the shower

• the size of the shower

Tags

NGSS.MS-PS1-2

You decide to clean your bedroom. You notice that your floor is covered with clothes. You decide to try to get rid of the clothes by throwing them into the air. You throw clothes from 1/3 of the room into the closet and 1/3 of the room straight up into the air, and the last 1/3 of the room you leave the clothes on the floor. After 30 minutes of “cleaning”, the floor of the room is now visible.

What is the dependent variable?

• the method used to pick up clothes

• the amount of the floor that is visible

• the size of the room

• how many articles of clothes are in the closet

Students at a University were split into two groups and each received a different text for a science course. Once group received a traditional text book, while the other received an interactive textbook on a tablet. After the course, the final exam grades between the two groups of students was compared.

What is the independent variable?

• the type of text

• the grades on the exam

• the amount of time they studied

• the number of students with each type of text.

Workers at a company were assigned to one of two conditions: One group completed a stress management training program; another group of workers did not participate in the training. The number of sick days taken by these workers was examined for the two subsequent months.

What is the dependent variable?

• stress management training program or no program

• number of sick days taken by the employees

• the number of workers in each group

• what kind of illness each worker got

Sally would like to determine which solution dissolves a peppermint the fastest. She places one peppermint in gatorade, one in tap water, and one in vinegar. She times each cup to determine which one dissolves the fastest.

What is the dependent variable?

• the peppermint

• the liquid

• the time it takes to dissolve

• how much liquid is in each cup

Tags

NGSS.MS-PS1-2