*Question*
Q: The primary role of leaves is to collect what? Read this paragraph and choose the correct option from the provided answers: Plants have specialized organs that help them survive and reproduce in a great diversity of habitats. Major organs of most plants include roots, stems, and leaves. Leaves are the keys not only to plant life but to all terrestrial life. The primary role of leaves is to collect sunlight and make food by photosynthesis . Despite the fundamental importance of the work they do, there is great diversity in the leaves of plants. However, given the diversity of habitats in which plants live, it's not surprising that there is no single best way to collect solar energy for photosynthesis. Choices: - pollen - insects - precipitation - sunlight A:
**Answer**
sunlight

*Question*
Q: Dependent on the frequency of sound waves, what term described how high or low a sound seems to a listener? Read this paragraph and choose the correct option from the provided answers: How high or low a sound seems to a listener is its pitch . Pitch, in turn, depends on the frequency of sound waves. Wave frequency is the number of waves that pass a fixed point in a given amount of time. High-pitched sounds, like the sounds of the piccolo in the Figure below , have high-frequency waves. Low-pitched sounds, like the sounds of the tuba Figure below , have low-frequency waves. For a video demonstration of frequency and pitch, go to this URL: http://www. youtube. com/watch?v=irqfGYD2UKw. Choices: - curve - wavelength - direction - pitch A:
**Answer**
pitch

*Question*
Q: If no conclusion is reached after an experiment, the scientist may retest what? Read this paragraph and choose the correct option from the provided answers: The scientist must next form a conclusion. The scientist must study all of the data. What statement best explains the data? Did the experiment prove the hypothesis? Sometimes an experiment shows that a hypothesis is correct. Other times the data disproves the hypothesis. Sometimes it's not possible to tell. If there is no conclusion, the scientist may test the hypothesis again. This time he will use some different experiments. No matter what the experiment shows the scientist has learned something. Even a disproved hypothesis can lead to new questions. Choices: - conclusion - materials - suggestions - hypothesis A:
**Answer**
hypothesis

*Question*
Q: Where was the distinction between total distance traveled and displacement first noted? Read this paragraph and choose the correct option from the provided answers: Discussion Quite a trip (if it survives)! Note that this distance is the total distance traveled by the fly. Displacement is actually zero for complete revolutions because they bring the fly back to its original position. The distinction between total distance traveled and displacement was first noted in One-Dimensional Kinematics. Choices: - uncertainty principle - Newton's first law - string theory - one-dimensional kinematics A:
**Answer**
one-dimensional kinematics