Unit 1 NOS Final Test

In science, when using C.E.R., what does reasoning do?

• It supports the claim by helping the scientist make good predictions.

• It is what all scientists do to answer a question.

• It supports the claim by connecting the evidence to the claim.

• It uses mathematics to predict what will happen in the future.

Why is it important for scientists to share their experimental evidence? (Choose all that apply.)

• So that other scientists can replicate the test.

• Scientists need to verify the work of other scientists.

• Data doesn't need to be shared because that is how scientists become rich.

• Scientific data must be checked for accuracy.

• Experimental data always stays the same and can never change.

Tags

NGSS.MS-ETS1-2

NGSS.MS-ETS1-3

The variable that the scientist measures in an experiment is called the (a)   .

• dependent variable

• independent variable

• control variable

• constant

Tags

NGSS.MS-PS1-2

Which of the following terms is now defined as an "educated guess"?

(a)  

• observation

• inference
• prediction

• hypothesis

The variable that is compared to the experimental group in a scientific experiment is called the (a)   .

• conclusions

• constants

• observations

• control group

When you finish working with chemicals and other lab substances, always:

• treat your hands with lotion.

• dispose of the materials as the teacher instructs you.

• dump them down the sink or in a trash can.

• leave them on the lab table.

The variable that is manipulated by the scientist in an experiment is called the ________.

• independent variable

• dependent variable

• control group

• constant

Tags

NGSS.MS-PS2-2

Using the procedure below, identify two ways that the student could improve the procedure so that their reasoning is supported by the evidence.

Question:

Does the amount of light that a plant receives affect its growth?

Experimental Procedure:
Set up the following experiment to test how light affects the growth of tomato plants.

1) Plant three tomato seedlings in identical pots with the same type of soil.

2) Place each plant in the following environment:

Plant A: Full sunlight for 10 hours a day.

Plant B: Partial sunlight for 5 hours a day.

Plant C: Low light for 2 hours a day.

3) Water Plant A once per day, Plant B once every other day, and Plant C once every two days.

4) After two weeks, measure the height of the plants.

Data:

Plant A: 15 cm

Plant B: 12 cm

Plant C: 7 cm

The Student Responded:

Claim:
Yes, the amount of light a plant receives does affect its growth.

Evidence:
The plant that received the most sunlight (Plant A) grew the tallest at 15 cm, the second tallest plant (Plant B) grew 12 cm, and the smallest plant grew to 7 cm (Plant C).

Reasoning:
Plants use sunlight to perform photosynthesis, the process they use to make energy to grow. Without enough light, plants cannot make enough energy, which stunts their growth. In this experiment, the more light a plant received, the taller it grew, demonstrating that light is essential for plant growth.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS1-6

NGSS.MS-LS2-1

Identify the following as either an OBSERVATION, INFERENCE, or PREDICTION:

"A student is eating a chocolate bar, so she must have purchased it from a teacher."

(a)  

• OBSERVATION

• INFERENCE

• PREDICTION

Identify the following statement as either an OBSERVATION, INFERENCE, or PREDICTION:

"I always hear an owl hoot at 7 o'clock at night near my house."

(a)  

• OBSERVATION

• INFERENCE

• PREDICTION