SC.7.N.1.4

Keesha did an experiment to study the rate of photosynthesis in the water plant Elodea. She placed a piece of Elodea in a beaker of water and set the beaker 10 centimeters (cm) from a light source. Keesha counted the bubbles released from the plant every minute for five minutes (min). She repeated the process two more times. First, she moved the light to 20 cm from the beaker, and then she moved the light to 30 cm from the beaker. Keesha’s setup and data are shown below

NUMBER OF BUBBLES

Time (min) Distance (cm)

10 cm 20 cm 30 cm

1 min 30 5 1 <--(bubbles)

2 min 29 5 1

3 min 31 6 3

What is the outcome variable (dependent variable) in this experiment?

• the number of bubbles produced

• the type of plant placed in the beaker

• the amount of time the bubbles in the beaker

• the distance of the light source from the plant

Tags

NGSS.MS-LS1-6

SC.8.E.5.3

Karla and Carlos are making observations about the night sky. As they look up at the stars they notice that some of them look brighter than others while some can't even be seen at all. They though about the sun in our solar system and though, why is it that some stars are larger than our sun but seem to look much smaller?

• The stars being observe in the night sky are actually much smaller than the sun

• The stars being observed in the night sky are much closer than the sun

• The stars being observe in the night sky are much further than the sun

• The stars been observed are dwarfs stars only

Tags

NGSS.MS-ESS1-3

Helen is studying the growth of two different types of plants. She planted two of each type of plant in locations with different levels of sunlight: full sun, partial shade, and full shade. For five weeks, Helen records the number of new leaves on each plant.

Which of the following statements correctly describes the independent and dependent variables in Helen's experiment?

• The independent variable is the kind of plant, and the dependent variable is the amount of sunlight.

• The independent variable is the amount of sunlight, and the dependent variable is the number of new leaves.

• The independent variable is the amount of sunlight, and the dependent variable is the kind of plant.

• The independent variable is the number of new leaves, and the dependent variable is the amount of sunlight.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

What is a hypothesis

• An idea in science

• A question and or prediction about a phenomenon

• An idea backed by tested factual evidence

• Data and facts from experimentation

• An experiment

A scientist wanted to know more about these blue birds at a beach. He goes to the beach and he writes down everything he sees the birds doing and all the sounds they make. This is an example of which scientific tool?

• observation

• analysis

• hypothesis testing

• replication

Ms G wants to see if the type of fertilizer affects the height of a sunflower plant. What is the dependent variable?

• type of fertilizer

• height of the sunflower plant

• amount of fertilizer

• health of the sunflower plant

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

SC.7.N.1.2

Cara read an article on why repetition and replication are so important, but she did not understand the difference between them. Which of the following best explains the two terms?

a. Repetition is when a scientist repeats an experiment; replication is when a scientist conducts an experiment on genetic material.

b. Repetition is when a scientist does the same experiment a number of times; replication is when other scientists reproduce a scientist’s experiment.

c. Repetition is when a scientist publishes in more than one scientific periodical; replication is when another scientist reproduces another scientist’s results.

d. Repetition is when a scientist commits an error in an experiment the first time and must repeat it; replication is when a scientist repeats an experiment to make sure it is valid.

• a

• b

• c

• d

Hayley baked chocolate chip cookies that wound up looking like muffins. She asked Lucy to use the same directions and see if her cookies also look like muffins.

• repetition
• replication

examine data and summarize it

• communication
• analysis
• investigation
• science

Tags

NGSS.MS-ESS2-3

NGSS.MS-LS2-1

NGSS.MS-LS4-1

NGSS.MS-PS1-2

any information collected with the senses

• variable
• observation
• Scientific Method
• classify

Tags

NGSS.MS-LS1-8