Unit 1: Scientific Method, Conversions

In an experiment about growth, some snapdragon seeds were placed in dishes lined with moist paper towels at differing temperatures. Which of these is the independent variable in this experiment?

• the number of sprouts

• the type of seed

• the temperature

• the size of the paper towel

Tags

NGSS.MS-LS1-5

A medical researcher hypothesizes that a new medication can reduce high blood pressure. Which of these would most likely be the dependent variable in a study involving this medication?

• blood pressure of the group

• the ages of the group

• the number in the group

• the new medication

A student plans to conduct an experiment to determine how a change in the pH of water affects the population growth rate of algae. To ensure that her experimental data are valid, she should...

• vary the temperature

• hold the pH constant

• use the same species of algae

• only do the experiment once

Tags

NGSS.MS-LS1-5

You design an experiment to test the effect of temperature on bacterial growth. You use three bacteria cultures under three heat lamps at different temperatures. What is the dependent variable in this experiment?

• bacterial growth

• temperature

• length of the experiment

• type of bacteria used

Tags

NGSS.MS-LS1-5

Sharon wants to conduct an experiment to determine if increasing the concentration of carbon dioxide around a plant will affect the plant’s rate of photosynthesis. She knows she must complete the following steps:

(1) Interpret data and display results in a graph.

(2) Record data as she conducts the experiment.

(3) Evaluate data and draw conclusions.

(4) Make a hypothesis

In which order should she conduct these steps?

• 2, 4, 3, 1

• 4, 2, 1, 3

• 3, 1, 2, 4

• 4, 2, 3 ,1

Tags

NGSS.MS-LS1-6

NGSS.MS-LS2-1

The Olympic record for the high jump is just over 2.6 yards. What is that distance in feet? (3 ft = 1 yd)

• 0.867 ft

• 7.8 ft

• 8.07 ft

• 8.27 ft

How many kilograms of calcium are there in 173 pounds of calcium? (1 lb = 454 g; 1 kg = 1000 g)

• 1.10 kg

• 78.5 kg

• 110 kg

• 78500 kg

How many minutes are in a school year, 187 days?

• 269, 280 min.

• 16, 200 min.

• 16, 156 min.

• 16,156, 800 min.

Which SI unit is used to measure length?

• mol

• m

• kg

• m²

Which SI unit is used to measure mass?

• s

• m

• kg

• Pa