Cutting planes for sections are generally shown on __________.

Cutting planes for sections are generally shown on floor plans. This is because floor plans provide a comprehensive view of the layout and organization of spaces in a building. When a section is drawn from a cutting plane indicated on the floor plan, it allows for a detailed representation of the vertical relationship between different elements, such as walls, floors, and openings, giving clarity to how these components interact in three dimensions.

The cutting plane line typically indicates where the imaginary cut is made to visualize the building's interior in a section view. This aids in understanding the height, elevation, and arrangement of different spaces as they relate to one another, which is particularly vital in residential and light commercial construction.

The other options, while important in their contexts, do not typically serve as indicators for cutting planes. Elevation views focus on vertical aspects of a structure, site plans present the arrangement of buildings on a property, and roof plans illustrate the configuration and features of the roof. Each serves a specific purpose in the architectural drawing set but does not primarily indicate the cutting planes for generating section views like floor plans do.