B.S.F. or B.Sc.F. Bachelor of Science in Forestry Bachelor of Science in Forestry: Soil Science and Forest Health 2

Question 1

Which soil horizon is typically referred to as the 'zone of leaching' where minerals and organic matter are washed downward?

Accepted Answer

E horizon

Answer

The E horizon is the eluviation layer where clay, iron, aluminum, and organic matter are leached downward by percolating water.

Question 2

A forester observes that trees in a stand are exhibiting interveinal chlorosis on young leaves. Which micronutrient deficiency is most likely responsible?

Accepted Answer

Iron

Answer

Iron deficiency causes interveinal chlorosis specifically in young leaves because iron is immobile in plants and new growth shows symptoms first.

Question 3

Cation exchange capacity (CEC) is highest in soils dominated by which clay mineral?

Accepted Answer

Smectite (montmorillonite)

Answer

Smectite clays have an expandable lattice structure with very high surface area, giving them the highest CEC of common clay minerals.

Question 4

In forest soils of the southeastern US, Phytophthora cinnamomi causes a root rot disease that is most severe under which soil condition?

Accepted Answer

Poorly drained, waterlogged soils

Answer

Phytophthora cinnamomi thrives and spreads its zoospores most effectively in poorly drained, saturated soils where anaerobic conditions develop.

Question 5

Which of the following best describes the role of ectomycorrhizal fungi in forest nutrient cycling?

Accepted Answer

They extend the effective root surface area and enhance mineral nutrient uptake

Answer

Ectomycorrhizal fungi form a sheath around tree roots and extend hyphae far into the soil, dramatically increasing the volume of soil explored for water and nutrients like phosphorus.

B.S.F. or B.Sc.F. Bachelor of Science in Forestry Practice Test

B.S.F. or B.Sc.F. Bachelor of Science in Forestry Practice Test

B.S.F. or B.Sc.F. Bachelor of Science in Forestry Bachelor of Science in Forestry: Soil Science and Forest Health 2