Controlled Experiments

A scientific hypothesis . . .

• can be graphed

• shows data in a table

• remains constant

• is a testable explanation

In a controlled experiment . . .

• all variables are constant except the one you are testing

• more than one variable can be tested at a time

• data is not collected

• the hypothesis is always supported

If you are testing how fertilizer affects plant growth . . .

• the plants can be different species

• the plants should be exactly the same (size, health, age)

• you have to start with seeds instead of plants

• you can't test this

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

The variables that stay exactly the same in an experiment are called . . .

• independent

• dependent

• constants

• there are no variables in an experiment

If you are testing how fertilizer affects plant growth, which one is NOT a constant?

• amount of sunlight

• temperature

• amount of water

• amount of fertilizer

Tags

NGSS.MS-LS1-5

Which is NOT true about a hypothesis?

• it is a testable explanation

• it will always be supported by the experiment

• it is sometimes called an educated guess

• it is written in an IF-THEN format

Identify the following:

IF Plant A receives fertilizer, THEN it will grow larger than Plant B.

• hypothesis

• experiment

• variable

• data

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

How do you show that the following hypothesis is correct?

IF Plant A receives fertilizer, THEN it will grow larger than Plant B.

• record and analyze plant measurement data

• stop using fertilizer

• look at plant growth, but do not measure it

• use different species of plants

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

For the following hypothesis, what is being TESTED?

IF Plant A receives fertilizer, THEN it will grow larger than Plant B.

• plants

• fertilizer

• plant growth

• amount of soil

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-4

For the following hypothesis, what is being MEASURED?

IF Plant A receives fertilizer, THEN it will grow larger than Plant B.

• plants

• fertilizer

• plant growth

• amount of soil

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1