CBM Fire Behavior & Ecology 1 — Questions and Answers
Question 1: Which factor has the greatest influence on wildland fire spread?
- Humidity
- Fuel type
- Topography
- Wind (Correct answer)
Correct answer: Wind
Wind is the most significant factor influencing fire spread as it provides oxygen, pushes flames forward, and carries embers.
Question 2: What is the role of fuel moisture in fire behavior?
- It accelerates fire ignition
- It reduces fire intensity (Correct answer)
- It increases wind speed
- It causes spot fires
Correct answer: It reduces fire intensity
Higher fuel moisture slows combustion because water in vegetation absorbs heat energy before ignition occurs.
Question 3: Which fuel type typically burns the fastest?
- Large logs
- Shrubs
- Fine fuels like grass (Correct answer)
- Moist leaves
Correct answer: Fine fuels like grass
Fine fuels such as grasses and pine needles ignite easily and burn quickly due to their high surface-area-to-volume ratio.
Question 4: How does slope affect fire spread?
- It reduces flame length
- It increases moisture in fuels
- It slows down fire ignition
- It increases fire spread uphill (Correct answer)
Correct answer: It increases fire spread uphill
Fires move more quickly uphill because heat rises and preheats the fuel above, making it more flammable.
Question 5: Why is fire important in maintaining certain ecosystems?
- It permanently removes vegetation
- It introduces new pests
- It disrupts water cycles
- It supports ecological balance (Correct answer)
Correct answer: It supports ecological balance
Fire recycles nutrients, reduces invasive species, and promotes regeneration of fire-adapted plants.
Question 6: What is the term for small fires ignited ahead of a main fire to control its spread?
- Flashover
- Backburn (Correct answer)
- Headfire
- Spot fire
Correct answer: Backburn
A backburn is a fire set intentionally to consume fuels and halt the progress of an approaching wildfire.
CBM Fire Behavior & Ecology 1
Which factor has the greatest influence on wildland fire spread?