Imaginary plot size is defined as:

• A. The actual field plot size.
• B. The theoretical plot size used for calculations in inventory analysis.
• C. The minimum size standard for sampling.
• D. The maximum size allowed for a plot.

Answer: (B)

Imaginary plot size is a theoretical plot area used to standardize calculations in inventory analysis. It isn’t the actual piece of land you measure in the field; instead, it’s a chosen reference area that lets you express results (like volume, basal area, or density) on a common per-unit-area basis. By converting measurements from plots of various sizes to this standard imaginary size, you can compare plots consistently and aggregate data across a stand or region. This makes calculations manageable and comparable, which is why the described concept fits best.