PLEASE HELP! Biology Unit Test! 1. What percentage of the world's cropland soil is considered seriously degraded?
•10%
•35%
•40%
•70%

2. Which choice describes an agricultural practice that Nigeria can use to improve soil quality?
•intercropping
•using better herbicides and pesticides
•intensively harvesting the same land
•clearing more forests

3. Why were forests harvested without regard for the consequences for so long?
•They were viewed as an unlimited supply of wood. •People developed back-up plans for when the forests would be depleted. •The forests were always regrowing .
•No one thought they would be around long enough to worry about running out .

4. Which choices are tenets of ecological forestry? Choose all correct answers.
•Foresters should plan for the long-term and science should guide them.
•Forests have intrinsic value, humans need to extract forest products, and social and economic concerns are important. •Foresters should consider economic priorities above ecological priorities. •Silviculture should follow natural processes .

5. Which tree harvesting method removes whole trees in rows in several cuttings over several years?
•whole -tree harvesting •strip logging
•seed -tree cutting •shelterwood cutting

6. Why is selective cutting not a common strategy for managing forests despite having many benefits?
• It doesn't preserve biodiversity
•It's impossible to find the right trees
•it’s expensive.
•It doesn't prevent erosion

7. What is one way the Green Revolution impacted food production? •slow - growing crops •pesticide-resistant insects •high-yield crops.
•crops with low tolerance for droughts.

8. What is one way that technology can lead to greater food insecurity? •Herbicide-resistant crops can tolerate herbicide spraying.
•Crops grow faster and produce more
•Human population growth continues to surpass food production.
•The increased use of crops in biofuels has taken away from land used to produce food.

9. Which choice describes a strategy used to help restore cod populations ? •restrict fishing to trawling nets
•limit the size of fishing fleets and catches
•harvest only very young fish
•allow fishermen to harvest from protected areas when necessary

10. What makes a resource nonrenewable?
•It is exploited by human beings .
•It cannot be replenished in a reasonable amount of time.
•Some nations have more of it than others.
•It is always available in the same amount .