Honors Biology Quiz 1

Heating the sugar solution in a closed test tube is an unsafe laboratory practice in this experiment because it can lead to a build-up of pressure inside the test tube, potentially causing it to explode.

The patients were not told which type of pill they were taking in order to prevent bias when collecting data. If the patients were aware of whether they were taking the new medicine or a placebo, their expectations and beliefs about the effectiveness of the medicine could influence their perception of its effects. By keeping the patients unaware, the researchers can collect more objective and unbiased data on the effectiveness of the new medicine.

Surface tension is the property of water that allows animals like the water strider and Jesus Christ lizard to walk on water. Surface tension is the result of cohesive forces between water molecules at the surface, causing it to behave like a stretched elastic sheet. This creates a strong surface that can support the weight of small objects, such as the legs of these animals, without breaking or sinking.

The dependent variable in this experiment is the height of the plants. This is because the height of the plants is being measured and recorded as a result of the different types of commercial fertilizers used. The height of the plants is directly influenced by the independent variable, which is the type of fertilizer used.

High heat capacity refers to the ability of a substance to absorb and store heat energy without a significant change in temperature. In the case of water, it has a high heat capacity due to the strong hydrogen bonding between its molecules. This means that water can absorb a large amount of heat energy before its temperature increases, and it can also release heat energy gradually when it cools down. This property of water is responsible for its ability to heat up and cool down slowly, which in turn contributes to the more even temperatures in coastal towns and the formation of coastal sea/land breezes.

The experimental group in this experiment refers to the group of plants that are exposed to different types of commercial fertilizer. The other variables, such as the height of the plants, the plant in the potting soil, and the soil type, are not the focus of the experiment and are considered control variables or factors that are kept constant throughout the experiment. The purpose of the experiment is to test the effectiveness of different types of commercial fertilizers on the growth of tomato plants, making the plants in the different types of fertilizer the experimental group.

The control group in this experiment is the plant in the potting soil. This is because the control group is the group that does not receive any treatment or manipulation. In this case, the plant in the potting soil is the baseline group that is used to compare the effects of the different types of commercial fertilizers on the other plants. By keeping one plant in regular potting soil without any fertilizer, it allows for a comparison to be made between the height of the plants that received different types of fertilizers and the plant that did not receive any fertilizer.

The independent variable in this experiment is the soil type. This is because the researcher is manipulating and controlling the different types of commercial fertilizers that are being used for each plant. The height of the plants is the dependent variable, as it is being measured and recorded to see the effect of the different soil types on the growth of the plants.

The statement suggests that the speaker has already formed an opinion or expectation about the outcome of the experiment before it has even taken place. This preconceived notion can influence the way the experiment is conducted or interpreted, leading to biased results.

Cohesion refers to the attraction between molecules of the same substance. In the context of water, cohesion is responsible for the formation of water droplets and the ability of water molecules to stick together. This property is demonstrated in the James Bond demo, where water droplets are shown to stick to surfaces and form cohesive shapes.