Nature of Science Florida

Testing a hypothesis often involves a(n):

• answer

• experiment

• problem

• safety check

Tags

NGSS.MS-PS1-2

An experiment is performed on plants to see how different liquids affect plant growth. Each plant in the experiment is given a different liquid; water, apple juice, or milk. Each plant has the same amount of soil, sunlight, and listens to the same music. In this investigation, the independent variable is ...

• The type of plant

• The amount of sunlight

• The type of music

• The type of liquid

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Josh is doing an experiment to find out how different amounts of water affect the growth of bean plants. He waters the plants every Monday and Friday, measuring the amount of water carefully. He measures the change in plant height every Friday. What conclusion can you draw from the observations Josh recorded in his data table?

• Plants 1, 2, and 3 showed successful growth.

• Plant 2 and 3 will produce nearly the same number of beans.

• Plant 3 received an amount of water that encouraged rapid growth.

• Plant 4 should have grown the most, there was a problem with the seed.

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Mei is studying birds. She studied the beaks of the two birds in the picture. Mei predicted that the bird on the left would eat mainly seeds. Which of the following is the best way to test her prediction?

• Measure the exact size of both beaks.

• Plan an experiment to test if all birds eat seeds.

• Observe the birds in the wild to see what they eat.

• Ask other students if they agree with her prediction.

J. P. and Rosa investigate ways to grow tomatoes. They use three types of tomato plants and different amounts of fertilizer. They water each plant with 20ml of water every other day. They recorded the growth rate of each plant in the table below. J. P. and Rosa decided that the Big Boy and Beefsteak tomatoes grew the best, but their results cannot be reproduced. Which mistake did they make?

• J. P. and Rosa would have had better results if only they used one type of tomato.

• Every plant is individual, just like people. So some grow. faster than others.

• J. P. and Rosa needed to water their tomato plants every day to be more successful.

• J. P. and Rosa needed to use the same amounts of fertilizers for each type of tomato.

Tags

NGSS.MS-LS1-5

A scientist set up containers to collect water in three spots around town. He wanted to find out how much rain falls in each area. What should the scientist record when looking at each container?

• The amount of rainwater in each container

• The number of organisms present in each container

• The color of the rainwater in each container

• The temperature of the rainwater in each container

As part of an experiment, Jenna measured the mass of a red cube. Which best describes why she should record her experimental procedure?

• The exact experiment can be repeated by others, and the results can be compared.

• The data will help others to find other properties of the red block.

• By writing down her procedure, she does not have to tell anyone about her experiment.

• Others can change the experiment to get different results.

Martha is growing plants in her science class. Which variable is her independent variable? What did she change in her experiment?

• The height of the plants (seedlings)

• The type of plant

• The amount of sunlight

• The amount of water given per day

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

Martha is growing plants in her science class. Which variable is her outcome variable?

• The height of the plants (seedlings)

• The amount of sunshine

• The type of plant

• The amount of water given per day

Tags

NGSS.MS-LS1-5

NGSS.MS-LS2-1

What is the primary purpose of a control group in a scientific experiment?

• To provide a standard for comparison

• To introduce new variables

• To ensure the experiment is valid

• To increase the sample size