Planting Quiz

1.

Which of the following statement best describes the relationship between a hypothesis and a theory?

A.

A hypothesis is a well-established theory
B.

Weak theories are hypotheses, and strong theories are scientific laws
C.

Theory is another name for hypothesis
D.

A hypothesis is a statement based on an educated guess

Correct Answer
D. A hypothesis is a statement based on an educated guess

2.

A friend told you that watering plants with seawater would make them grow faster than when watering them with freshwater. You decided to make an experiment to test her hypothesis. You decided to bring two plant pots (Pot C and Pot T), Pot C acting as a control. What is your friend’s hypothesis?

A.

IF you water the plants with freshwater instead of seawater, THEN they will grow more quickly
B.

IF you water the plants with some seawater and some freshwater, THEN they will grow more quickly
C.

IF you water the plants with seawater instead of freshwater, THEN they will grow more slowly
D.

IF you water the plants with seawater instead of freshwater, THEN they will grow more quickly

Correct Answer
D. IF you water the plants with seawater instead of freshwater, THEN they will grow more quickly

3.

A friend told you that watering plants with seawater would make them grow faster than when watering them with freshwater. You decided to make an experiment to test her hypothesis. You decided to bring two plant pots (Pot C and Pot T), Pot C acting as a control. What is the variable being tested?

A.

Watering plants with seawater
B.

Watering plants with freshwater
C.

The percentage of salt in the water
D.

How fast plants grow

Correct Answer
A. Watering plants with seawater

4.

A friend told you that watering plants with seawater would make them grow faster than when watering them with freshwater. You decided to make an experiment to test her hypothesis. You decided to bring two plant pots (Pot C and Pot T), Pot C acting as a control. True or False: Pot T will be watered with seawater, while Pot C will be watered with freshwater

A.

True
B.

False

Correct Answer
A. True

5.

A friend told you that watering plants with seawater would make them grow faster than when watering them with freshwater. You decided to make an experiment to test her hypothesis. You decided to bring two plant pots (Pot C and Pot T), Pot C acting as a control. Your experiment showed that plants watered by seawater dried up and died quickly while plants watered by freshwater continued to grow. Therefore your friend’s hypothesis (is):

A.

Cannot be tested
B.

Correct
C.

Incorrect
D.

Incomplete

Correct Answer
C. Incorrect

6.

A friend told you that watering plants with seawater would make them grow faster than when watering them with freshwater. You decided to make an experiment to test her hypothesis. You decided to bring two plant pots (Pot C and Pot T), Pot C acting as a control. Identify the fixed variable(s) in your experiment: *you may choose more than one answer.

A.

Type of water used to water all pots
B.

Type of soil used in all pots
C.

Place were both pots are placed (temperature and exposure to light)
D.

Type of plant used in all pots

Correct Answer(s)
B. Type of soil used in all pots
C. Place were both pots are placed (temperature and exposure to light)
D. Type of plant used in all pots

Explanation
You should keep all these variables the same in order to ensure a fair experiment. If you don't, then your results may be affected by differences in these variables. Keeping them the same in both pots would 'cancel' their effect in your experiment - you therefore only change the variable you are testing (independent variable)!

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7.

A friend told you that watering plants with seawater would make them grow faster than when watering them with freshwater. You decided to make an experiment to test her hypothesis. You decided to bring two plant pots (Pot C and Pot T), Pot C acting as a control. Which tool(s) will you likely NOT use in your experiment? *You may choose more than one answer.

A.

Calendar
B.

Ruler
C.

Camera
D.

Burner
E.

Stopwatch

Correct Answer(s)
D. Burner
E. Stopwatch

Explanation
The trick here is "NOT" - Read the exam questions very carefully!
You may use a calendar to track days (time)
You may use a ruler to track height of plant and compare it to time (speed of growth)
You may use a camera to catalogue your findings visually
You may NOT use a burner as it is not relevant to your experiment or a stop watch.
* Plants need days to grow, and a stopwatch is used to measure short and fast time intervals. Example: The time a runner takes to cross to the finish line.

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