Certified Forester Exam questions with correct answers

What are the five soil‐forming factors? CORRECT ANSWER parent material, climate, topography, time, and biota. What is the term for the cross‐sectional area of a tree at breast height? CORRECT ANSWER Basal Area How is the grade of a log determined? CORRECT ANSWER Percentage of recovery What is the term for tree height where the upper stem diameter is equal to zero? CORRECT ANSWER Total height What is the diameter of the tree of mean basal area? CORRECT ANSWER Quadratic mean diameter How many stems per acre are represented by a 10‐inch DBH tree sampled with a 10‐BAF prism? CORRECT ANSWER 18.34 (#trees tallied x baf)/(dbh^2 x .005454)/# plots What is the formula for TPA CORRECT ANSWER (#trees tallied x baf)/(BA of each tree)/# plots What is the formula for BA CORRECT ANSWER dbh^2 x 0.005454 What is the per‐acre conversion factor for trees measured on a 0.2‐acre plot? CORRECT ANSWER 5