Scientific Method: Analysis-Inquiry-Design

A student finds the mass of a rock to be 55.0 g. The student is making

• an inference

• a hypothesis

• an explanation

• a measurement

A group of students did an experiment to measure the effects of water temperature on seed-germination time. The student planted the same number of two types of seeds in separate containers. Each container was made of clear and had 50 milliliters(ml) of soil. For one week, bean seeds where watered once a day with 5 ml of hot (30 degrees Celsius) water. Tomato seeds were watered once a day with 5 ml of cold water ( 10 degrees Celsius) The time it took each type of seed to germinate was observed and recorded. The experimental setup is represented in the diagram below

Identify two factors that were kept constant in this experiment. (1)

A group of students did an experiment to measure the effects of water temperature on seed-germination time. The student planted the same number of two types of seeds in separate containers. Each container was made of clear and had 50 milliliters(ml) of soil. For one week, bean seeds where watered once a day with 5 ml of hot (30 degrees Celsius) water. Tomato seeds were watered once a day with 5 ml of cold water ( 10 degrees Celsius) The time it took each type of seed to germinate was observed and recorded. The experimental setup is represented in the diagram below

Explain why using different seed types along with different water temperatures is an improper experimental design. (1)

Answer explanation

-you can't compare the results because there are 2 independent variables

-you can only change one variable at a time

- the student changed 2 variables

- they should have used all beans or all tomato seeds if different water temperatures were used.

The diagram represents a student separating a mixture of sand and hot water in a flask

Describe two safety procedures that the student in the diagram should be following in order to separate this mixture?(1)

At the end of a 10 year period, which color of rabbit appears to be best adapted to it's environment?

• white

• tan

• gray

• black

If the pattern of growth continues, how many bacteria will be in sample B when six hours have elapsed?

• 32

• 64

• 1024

• 2048

The diagram represents a graduated cylinder containing water before and after a rock suspended on a string is lowered into it.

What is the appropriate volume of the rock suspended in the graduated cylinder?

• 50 mL

• 100 mL

• 250 mL

• 300 mL

Answer explanation

Remember to subtract the Ending volume on the graduated cylinder from the beginning volume on the graduated cylinder to get the volume of the rock.

300 mL-250 ml=50 mL

The data table shows information gathered from a science experiment. Time was measured in seconds (s) and distance was measured in meters (m).

Which grid is correctly designed to show these data in a line graph?

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A student is setting up an experiment. The student has twenty identical young plants and will try to answer this question: How does the amount of water given to these plants each day affect how tall the plant will grow?

1. State an appropriate hypothesis for this experiment?

Answer explanation

-If young plants receive the greatest amount of water, then they will grow tallest

- The young plants that receive the least water will grow the tallest

-The more water a plant receives, the taller the plant will grow

A student is setting up an experiment. The student has twenty identical young plants and will try to answer this question: How does the amount of water given to these plants each day affect how tall the plant will grow?

Identify one condition , other than identical young plants, that should be held constant during the experiment?