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# Biology Form 2 Praxis

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A researcher hypothesizes that lectures do not convey information as well as written passages in a textbook do. The researcher separates 48 college freshman volunteers into two groups of 24, with an equal number of males and females in each group. One group hears a passage repeated three times over a two‑minute period. The second group reads the same passage for two minutes. All test subjects are then asked to write down as much as they remember of the passage. Which of the following is the independent variable in the experiment?
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A researcher hypothesizes that lectures do not convey information as well as written passages in a textbook do. The researcher separates 48 college freshman volunteers into two groups of 24, with an equal number of males and females in each group. One group hears a passage repeated three times over a two‑minute period. The second group reads the same passage for two minutes. All test subjects are then asked to write down as much as they remember of the passage. Which of the following is the independent variable in the experiment?
Option (C) is correct. The independent variable in an experiment is the one thing that is varied between experimental groups. The effect of the independent variable is typically what is being analyzed. In the situation described, the independent variable is the method by which the passage is presented to the test subjects, either aurally or visually.
continuous variation,Option (A) is correct. Human skin color, height, and weight are influenced by many genes as well as environmental factors. When the frequency in a population of different values for each one of these traits is plotted on a histogram, a bell‑shaped curve of continuous variation usually results. The values of a few individuals are at either end of the curve; the values of most individuals are intermediate and fall in the middle of the curve.
B.The polarity of water moleculesOption (B) is correct. Water molecules are polar because oxygen is more electronegative than hydrogen. The oxygen region of a water molecule has a partial negative charge, and the hydrogen regions have partial positive charges. The separately charged regions enable water to hydrate molecules that also have partially charged regions, which increases the solubility of the molecules.
Option (B) is correct. Water molecules are polar because oxygen is more electronegative than hydrogen. The oxygen region of a water molecule has a partial negative charge, and the hydrogen regions have partial positive charges. The separately charged regions enable water to hydrate molecules that also have partially charged regions, which increases the solubility of the molecules.

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