The significance of the 10 BAF in point sampling is:

• A. It is used to calculate the basal area and determine the number of plots needed.
• B. It measures soil moisture.
• C. It identifies crown class.
• D. It estimates tree height.

Answer: (A)

The main idea being tested is how Basal Area Factor (BAF) in point sampling translates tree hits into a measure of basal area per acre. In angle-count sampling, each tree that falls within the sampling angle represents a fixed amount of basal area on the land. That fixed amount is the BAF. With a 10 BAF, every counted tree adds 10 square feet of basal area per acre to your estimate. So if you count N trees in your sampling, your estimated basal area per acre is N × 10 ft²/acre. This makes the BAF a direct bridge between the number of trees you observe and the basal-area metric you’re estimating, and it also influences how many plots or observations you need to reach a desired level of precision—the higher the BAF, the fewer trees you need to count to get a given BA estimate, and vice versa.

So the significance of 10 BAF is that it sets the basal-area contribution per counted tree and thereby enables calculating the stand’s basal area per acre and guiding sampling intensity. It isn’t a measure of soil moisture, crown class, or tree height, which are determined by other methods.