Why is it important to have only one independent variable and to control the other variables when performing science experiments?

So you can tell which factor is causing the change in the experiment.

It does not matter, you can have as many independent variables as you want.

Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground. What is the independent variable?

Amount of time it takes the helicopter to hit the floor

Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground. What is the dependent variable?

Amount of time it takes the helicopter to hit the floor

Cindy wanted to find out how the amount of sunlight affects the growth of plants. She placed two tomato plants in 10 inch pots with potting soil and watered them ¼ cup each day. One plant was placed under a cardboard box and one was placed in the sunlight. She measured the growth of the plant each week for three weeks. What is the dependent variable?

Each plant was placed in a 10 inch pot

One plant is in the sunlight and the other is under a box

Cindy wanted to find out how the amount of sunlight affects the growth of plants. She placed two tomato plants in 10 inch pots with potting soil and watered them ¼ cup each day. One plant was placed under a cardboard box and one was placed in the sunlight. She measured the growth of the plant each week for three weeks. What are two controlled variables? (Select 2)

Each plant was placed in a 10 inch pot

One plant is in the sunlight and the other is under a box

Ben makes five paper helicopters with different wing lengths. He drops them the same way from a height of two meters for five trials each. He records the amount of time it takes for each helicopter to fall to the ground. What are two controlled variables? (Select 2 answers)

Amount of time it takes the helicopter to hit the floor

A scientist hypothesizes the the temperature at which an alligator's egg is incubated will determine whether the alligator will be male or female. The dependent variable is

the gender of the baby alligators

the size of the baby alligators

What is the first step in the scientific method?

Design and conduct an experiment

This step comes after ask a question

Design and perform an experiment

A scientific Question needs to be able to be...

Looked up on the internet or in a book

Biology Unit 1 Review

Quiz

•

Biology

•

9th - 12th Grade

•

Practice Problem

•

Medium

•

NGSS.MS-LS1-5, CCSS.RI.11-12.2, CCSS.RI.11-12.7

+17

Standards-aligned

Jennifer Sauve

Used 38+ times

FREE Resource

30 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A scientist discovers the body of an unknown species of frog in the rain forest of Brazil. She writes several statements in her journal about the animal shown above. Which of the following is an observation about the frog?

The frog might be poisonous because it is very brightly colored.

It has a mass of 22.4 grams.

The frog is probably a tree climber because it has large, round toe pads.

I think the frog is a species of poison dart frog because of its size and color.

Tags

CCSS.RI.11-12.7

CCSS.RI.8.7

CCSS.RI.9-10.7

CCSS.RL.11-12.7

CCSS.RL.9-10.7

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A student placed 50 mealworms in the middle of an aquarium containing a light, a cardboard tube and a water dish. He waited five minutes and then recorded the data for the first trial in the table above. The student repeated this procedure two more times, and recorded the results. Read the results of all three trials. Which inference could you make about mealworms based on the results.

The mealworms probably prefer the darkness of a cardboard tube.

There were 6 mealworms under the light in trial 2.

Mealworms love water.

There were 36 more mealworms in the cardboard tube versus the light in trial 3.

Tags

NGSS.MS-LS1-4

NGSS.MS-LS2-1

3.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is observation? A good scientist is observant and notices things in the world. This leads to curiousity!

Information gathered using the 5 senses

A question based on past experience

A prediction

Information that only comes from measurements

Tags

CCSS.RI.11-12.2

CCSS.RI.9-10.1

CCSS.RL.11-12.1

CCSS.RL.8.1

CCSS.RL.9-10.1

4.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is an inference?

Just a random guess

A prediction or logical conclusions about our observations

The same as an observation

deciding if an observation is qualitative or quantitative

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The girl is folding her arms.

Observation

Inference

Tags

CCSS.RI.11-12.2

CCSS.RI.9-10.1

CCSS.RL.11-12.1

CCSS.RL.8.1

CCSS.RL.9-10.1

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

It's December.

Observation

Inference

Tags

NGSS.MS-ESS2-6

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The 2 men are wearing black.

Observation

Inference

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Biology Unit 1 Review

30 questions

A scientist discovers the body of an unknown species of frog in the rain forest of Brazil. She writes several statements in her journal about the animal shown above. Which of the following is an observation about the frog?

What is observation? A good scientist is observant and notices things in the world. This leads to curiousity!

What is an inference?

The girl is folding her arms.

It's December.

The 2 men are wearing black.

They are in a hospital.

Which statement is an inference about this picture?

What is an observation for this picture?

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