There are three Insects that are being compared under a microscope. As a scientist, you decide that measuring them would be an important part of recording their data. Which unit of measurement would best for this situation?

A. Centimeters

B. Meters

C. Micrometers

D. Kilometers

Answer Explanation:

The best use of the International System of Units (SI) for this situation would be the use of the micrometer as it is the smallest unit of measurement provided and the scientist is using a microscope to view the insects.

Therefore, the Correct Answer is C.

Q #1: A chemistry experiment is performed to determine the effect of a nonvolatile solute on the boiling point of water. Three trials are performed in which 10 mg, 20 mg, and 30 mg of salt are added to 500 mL of distilled water. Each solution is heated on a hot plate, and the elevated boiling points are recorded. Determine the dependent and independent variables in this question.

A. The independent variable is the amount of salt, and the dependent variable is the temperature at which the water boils.

B. The independent variable is the amount of water, and the dependent variable is the temperature at which the water boils.

C. The independent variable is the temperature at which the water boils, and the dependent variable is the amount of salt.

D. The Independent variable is the amount of salt, and the dependent variable is the amount of water.

Answer Explanation

In a scientific experiment, the dependent variable is the condition that is being tested and measured. The independent variable is the condition that is being changed or controlled. In this example, the amount of salt is varied, and the boiling point of water is measured. Therefore, the independent variable is the amount of salt, and the dependent variable is the temperature at which the water bolls.
Q #2: What is a hypothetical explanation for an occurrence that is based on prior knowledge called?

A. Independent variable

B. Dependent variable

C. Trial

D. Hypothesis

Answer Explanation

A hypothesis is the use of prior knowledge in order to provide a hypothetical explanation for why something may or may not occur. A hypothesis can be proved wrong or right based on the results of the experiment and repeated trials.
Q #3: Your class is competing with another class to determine who has the best plant color. Your class decides to test a couple of solutions to determine which would be best for overall plant color before competing. Starting with four sets of four plants, the class decides to water each set with a different solution. They water them once a week with 200ml of the following solutions: water, diet soda, 1% bleach solution, and a 1% salt solution. All plants are placed in the window that receives the recommended amount of light. After a month of testing, your class notices that only two plants are alive, but one of those two does not look healthy. Based on these results, which of the following would be a good hypothesis to design the next experiment around?

A. Plants need more than 200 mL of liquid per week.

B. Salt has no impact on plant health.

C. Salt contains useful nutrients for plants.

D. A combination of the solutions tested will produce healthier plants.

Answer Explanation

Since only 2 out of the initial 16 plants survived the whole month, it would be reasonable to test variables that were shared by all the plants. As such, the amount of liquid the plants need would be a good follow-up experiment. It is not specified as to which plants survived, so there is not enough information to think that testing the impact of salt is warranted. Additionally, since almost all the plants died, it is not reasonable to assume that a combination of the solutions would have an impact.

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There are three Insects that are being compared under a microscope. As a scientist, you decide that measuring them would be an important part of recording their data. Which unit of measurement would best for this situation?

More Questions on TEAS 7 Science

Answer Explanation

Q #2: What is a hypothetical explanation for an occurrence that is based on prior knowledge called?

Answer Explanation

Answer Explanation

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