CF Risk Assessment & Management 4

Question 1

A forester is designing a fuel break network to protect a community from wildfire. What is the RECOMMENDED minimum width of a fuel break on moderate terrain (20–40% slope) under most US guidelines?

Accepted Answer

300 feet

Answer

Most US wildfire protection guidelines recommend fuel breaks of at least 300 feet on moderate slopes to provide adequate buffering against ember cast and radiant heat under typical fire weather conditions.

Question 2

Which of the following soil conditions MOST increases the risk of landslide following clearcut harvest on steep slopes?

Accepted Answer

Decline of root biomass strength 3–5 years post-harvest before regeneration reestablishes

Answer

Root strength from harvested trees declines significantly in the first few years post-clearcut before regenerating vegetation reestablishes roots, creating a critical window of heightened slope instability.

Question 3

Which regulatory framework primarily governs the risk assessment requirements for pesticide applications in US national forests?

Accepted Answer

FIFRA (Federal Insecticide, Fungicide, and Rodenticide Act)

Answer

FIFRA governs pesticide registration and use requirements, including label compliance and risk assessment, for all pesticide applications including those in national forests.

Question 4

A forester is assessing drought-induced tree mortality risk using the 'carbon starvation' hypothesis. This hypothesis proposes that prolonged drought kills trees primarily by:

Accepted Answer

Depletion of non-structural carbohydrate reserves due to stomatal closure reducing photosynthesis

Answer

The carbon starvation hypothesis holds that trees close stomata during drought to prevent desiccation, but this halts photosynthesis, ultimately depleting carbohydrate reserves needed for growth and defense.

Question 5

When assessing structural fire risk in the wildland-urban interface (WUI), which home ignition zone is responsible for the MAJORITY of home losses in wildfires?

Accepted Answer

Roof and attic ignition from spotting firebrands landing on the structure

Answer

Research by the Insurance Institute for Business and Home Safety shows that ember ignition of roofs, vents, and decks—not direct flame contact—is responsible for the majority of WUI home losses.

(CF) Certified Forester Exam Practice Test

(CF) Certified Forester Exam Practice Test

CF Risk Assessment & Management 4