Question

quiz: group dynamics, what is science, observation vs inference, and experimental design. read the paragraph and then match each item with correct statement. an experiment was designed to investigate the effect of sugar on the blood - glucose level of goldfish. two populations of goldfish were obtained. to maintain stability, both populations had water with the same mineral content, were supplied with identical amounts of plant matter as food, received the same amount of light, and did not allow the temperature to exceed 20°c. every two hours, the goldfish from both populations were selected and the status of blood - glucose levels were monitored. the goldfish of population one had sugar administered five minutes before their blood - glucose level was checked. the goldfish of population two were not exposed to sugar, given nothing and then had their blood - glucose level checked. what part of the experiment was the sugar? what part of the experiment was the blood - glucose level of the goldfish? what part of the experiment was population one? what part of the experiment was the water temperature?

Explanation:

1. Independent Variable: The independent variable is the factor that is deliberately changed or manipulated in an experiment. Here, it is the sugar, as one population of gold - fish is given sugar while the other is not.
2. Dependent Variable: The dependent variable is the factor that is measured or observed and is expected to change due to the independent variable. In this case, it is the blood - glucose level of the goldfish.
3. Control Group: The control group is the group that is not exposed to the independent variable. The goldfish of population two, which are not exposed to sugar, are the control group.
4. Constants: Constants are the factors that are kept the same throughout the experiment to ensure that only the independent variable affects the dependent variable. Here, the constants are the amount of food, light, water temperature (not exceeding 20°C), mineral content, and the amount of plant matter provided to both populations of goldfish.
5. Experimental Group: The experimental group is the group that is exposed to the independent variable. The goldfish of population one, which have sugar administered, are the experimental group.

Answer:

• Independent Variable: Sugar
• Dependent Variable: Blood - glucose level of goldfish
• Control Group: Goldfish of population two
• Constants: Amount of food, light, water temperature (≤20°C), mineral content, amount of plant matter
• Experimental Group: Goldfish of population one