Identifying Variables in a Controlled Experiment

Identify the independent variable of the following scenario: A student wanted to test the impact of pH on germination (growing) of plant seeds. The student put bean seeds and water with a "normal" pH 7 neutral solution in one petri dish. A second petri dish had seeds with water that has a pH of 3 acidic solution. The student then put both petri dishes in the dark and checked them every day for a week. The student recorded the number of seeds that germinated (started to grow) and the length of the plant as it grew.

• the amount of water in each petri dish
• the pH of the solution the seeds were placed in
• the amount of seeds in each petri dish
• the amount of light

Tags

NGSS.MS-LS1-5

Identify the experimental group of the following scenario: A student wanted to test the impact of pH on germination (growing) of plant seeds. The student put bean seeds and water with a "normal" pH 7 neutral solution in one petri dish. A second petri dish had seeds with water that has a pH of 3 acidic solution. The student then put both petri dishes in the dark and checked them every day for a week. The student recorded the number of seeds that germinated (started to grow) and the length of the plant as it grew.

• The seeds in the petri dish with the "normal" pH 7 water solution
• The petri dish with the most seeds germinated
• The seeds in the petri dish with the pH 3 water solution
• The petri dish with the least seeds germinated

Tags

NGSS.MS-LS1-5

Identify the control group of the following scenario: A student wanted to test the impact of pH on germination (growing) of plant seeds. The student put bean seeds and water with a "normal" pH 7 neutral solution in one petri dish. A second petri dish had seeds with water that has a pH of 3 acidic solution. The student then put both petri dishes in the dark and checked them every day for a week. The student recorded the number of seeds that germinated (started to grow) and the length of the plant as it grew.

• The seeds in the petri dish with the pH 14 water solution
• The seeds in the petri dish with the "normal" pH 7 solution
• The seeds that germinated the best
• The seeds in the petri dish with the pH 3 water solution

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

In a controlled experiment, the researcher can have multiple independent variables.

• True
• False

In a controlled experiment, the researcher can have multiple dependent variables.

• True
• False

Identify the dependent variable(s) of the following scenario: A student wanted to test the impact of pH on germination (growing) of plant seeds. The student put bean seeds and water with a "normal" pH 7 neutral solution in one petri dish. A second petri dish had seeds with water that has a pH of 3 acidic solution. The student then put both petri dishes in the dark and checked them every day for a week. The student recorded the number of seeds that germinated (started to grow) and the length of the plant as it grew. Check off all that apply

• production of water in each petri dish
• number of seeds germinated
• production of seeds in each petri dish
• length of plants as they grew
• the amount of time in the petri dishes

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Identify the constants/controlled variable(s) of the following scenario: A student wanted to test the impact of pH on germination (growing) of plant seeds. The student put bean seeds and water with a "normal" pH 7 neutral solution in one petri dish. A second petri dish had seeds with water that has a pH of 3 acidic solution. The student then put both petri dishes in the dark and checked them every day for a week. The student recorded the number of seeds that germinated (started to grow) and the length of the plant as it grew. Check off all that apply

• Amount of seeds present
• Location of the petri dishes
• size of petri dishes
• Temperature of the dishes
• pH of solution between both petri dishes

Tags

NGSS.MS-LS1-5

Match the description with the terms

Groups:

(a) Experimental Group

,

(b) Control Group

• The group left alone, not exposed to the independent variable

• The group exposed to the independent variable

Tags

NGSS.MS-PS2-5

Match the description with the term

Groups:

(a) Constants (controlled variables)

,

(b) Dependents variable

,

(c) Independent Variable

• The data collected in an experiment

• The one thing that changes in an experiment

• The factors that are kept constant (the same) between the two groups of an experiment

The independent variable is the ONE thing you _____ to test your hypothesis.

• change
• keep the same
• experiment with
• investigate

Tags

NGSS.MS-PS2-2