Build the basics, then work through timber measurement, compass skills, and maps.
Short explanations first. Listen to one card or play the full lesson path.
Xylem carries water and dissolved minerals upward from the roots. Phloem carries sugars made in the leaves to the parts of the tree that need them. The cambium is a thin growing layer that makes new xylem and phloem.
Memory cue: Say it twice: xylem = water up; phloem = food flow; cambium = new growth.
Photosynthesis uses light energy to make sugars. Stomata are tiny leaf openings involved in gas exchange. Transpiration is water vapor leaving a plant, mostly through its leaves. When stomata close, transpiration is reduced.
Memory cue: Think of stomata as adjustable doors: they help exchange gases and release water vapor.
DBH means diameter at breast height and is normally measured 4.5 feet above ground. A standard cord is a stack 4 feet high, 4 feet wide, and 8 feet long: 128 cubic feet. Board feet = thickness in inches × width in inches × length in feet ÷ 12. Basal area is the cross-sectional area of stems, usually measured at DBH.
Memory cue: For board feet, write T × W × L ÷ 12 before calculating. One acre contains 43,560 square feet.
A stand is a group of trees similar enough to manage as a unit. Thinning removes selected trees to reduce competition. A seed-tree method leaves some mature trees to provide seed; selection removes individual trees or small groups over time. A dominant crown rises above the canopy; a suppressed crown gets little direct light.
Memory cue: If a question says “same age,” look for even-aged. Several age classes point to uneven-aged.
From largest to smallest, the main soil particles are sand, silt, and clay. A pH of 7 is neutral. A watershed drains toward a common outlet. Streamside Management Zones help protect water quality. The fire triangle is heat, fuel, and oxygen. Prescribed fire can reduce built-up fuels and maintain fire-adapted ecosystems when planned and conducted by trained professionals.
Memory cue: Sand → silt → clay gets smaller. Fire needs all three: heat + fuel + oxygen.
Site index estimates how productive a site is for a particular tree species. It is commonly based on the age and height of dominant or codominant trees. Compare the same species at the same reference age; greater height generally indicates a higher site index.
Memory cue: Same species + same age + taller dominant trees = higher site index.
Look at what you actually have: a twig, a leaf, needles, a cone, or bark. Sort the specimen by foliage and leaf arrangement. Compare details such as margins, buds, undersides, veins, and fruit. Then name the tree and say two visible clues. For compound leaves, check where the whole leaf attaches to the twig: leaflets do not each have a bud at their base.
Memory cue: Your best answer sounds like: “It is ___ because I see ___ and ___. It is not ___ because ___.”
Azimuths run clockwise from north: north is 0° or 360°, east is 90°, south is 180°, and west is 270°. Calibrate your own pace on a known distance and keep the same single-step or double-step convention. Distance equals your counted paces multiplied by feet per pace.
Memory cue: Keep direction and distance separate: sight the bearing, pick a landmark, then count your calibrated paces.
Contour lines connect points of equal elevation. Closely spaced contours mean a steeper slope on the same map. At a scale of 1:24,000, one map inch represents 24,000 ground inches, or 2,000 feet. A standard section contains 640 acres; a quarter section contains 160 acres.
Memory cue: Write the units at every step. Read the map legend and contour interval rather than assuming them.
Practice the field sequence used to estimate usable wood across a forest.
Record the trees on the assigned plot and use the measuring method the judge provides.
The published guide describes either pulpwood cords or saw-timber board-foot volume.
Apply the plot-size factor to the measured sample. Check the units and arithmetic before recording.