What type of laboratory glassware is typically used for holding reactions in small quantities?

Test tubes are specifically designed for holding small quantities of liquids during reactions or experiments. They have a narrow, cylindrical shape, which allows for easy mixing and observation of the contents. This shape also helps in minimizing the risk of spills when handling small volumes. Test tubes can be easily heated over a flame or in a water bath, making them versatile for various laboratory applications.

In contrast, cylinders are primarily used for measuring liquid volumes accurately, while beakers are better suited for larger quantities of liquids or for general mixing rather than precise reactions. Pipettes are tools used for transferring small amounts of liquid, rather than holding them, which distinguishes their function from that of test tubes. Therefore, test tubes are the appropriate choice for conducting reactions in small quantities.