MCQ 1. How can wildfires maintain or increase diversity in a forest? a) by reduc
ID: 299683 • Letter: M
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MCQ 1. How can wildfires maintain or increase diversity in a forest? a) by reducing the amount of fuel available for future fires c) by killing off invasive species e) by killing off pine beetles b) by opening gaps in the forest canopy d) by killing off soil microorganisms 2. If wildfires were eliminated, jack pines would go extinct. Why? a) wildfires remove parasites from jack pine trees, which would otherwise kill the tree b) jack pine bark is resistant to fire, allowing it to flourish as other species are removed by fire c) jack pine cones open only after a tree has been burned d) jack pines rely on ash in the soil for nutrient:s e) other tree species outcompete jack pines in regions 3. Which of the following controls the timing of seasonal wildfires in southern California? b) rainfall the previous winter d) sea surface temperatures just offshore a) intensity of Santa Ana winds c) rainfall the previous autumn e) logging schedules 4. A fire is considered extinct when a) you can no longer see flames c) smoke is no longer observed e) the source of combustion is removed b) combustion, including smouldering, ceases d) flaming combustion ceases Short Answer 1. Why do wildfires on steep slopes often increase in speed upslope as they spread?Explanation / Answer
1) c) killing off invasive species
. Invasive species consume an areas maximum biocapacity. If you had to graph the population in a forest with an intrusive species then Burn It Down you will find that the elimination of vital habitat wood force the over abundant specimen to repopulate elsewhere in a sense give all applicable forest species an equal chance to reproduce and therefore costitute to Greater diversity.
2)c) Jack fine cones open only after a tree has been burned
3)a) intensity of Santa Ana winds
During Santa Ana event precipitation fall below average indicating the fuel moisture is a key controller of ignition.
4)e) the source of combustion is removed
* short answer
1) when a Wildfire moves onto an upslope, the slope will assist the fire development and increase its efficiency, accelerating the combustion process. The fuel is brought closer to the flame by the angle of the slope and this is then subjected to more preheating. the steeper the angle of the slope the more preheating the fuel is subjected to. When a fire moves across level ground or downslope most of the heat generated by the Fire will be lost to the atmosphere.
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