WorksheetsDeforestation- textbook check
Total questions: 24
Worksheet time: 10mins
What is the major determinant in classifying forests?
climate
longitude
humans
altitude
What proportion of forests are found in the tropics?
about three quarters
about one third
about half
about three quarters
Which term best describes a forest that is mostly 'intact' or has 'old growth'?
secondary forest
primary forest
tertiary forest
plantation
Which term best describes forest that has native species but has been relatively disturbed by human activity such as replanting?
secondary forest
primary forest
tertiary forest
plantation
Which term best describes an area of trees planted for commercial purposes?
primary forest
secondary forest
tertiary forest
plantation
During the LGM, when the earth was colder and more arid and sea levels were at least 100m lower, what was the distribution of forests and other biomes like?
more extensive than today, less desert and grassland
less extensive than today, more grasslands, desert and tundra
the same as present day
there was only extreme desert present
Which of these best describes forest cover during the HCO 8000 years ago when approx 5 million people lived on Earth?
forests expanded poleward due to warmer and wetter conditions
forests expanded into higher altitudes
47% of Earth covered by forest
all of the above
The causes of deforestation between the LGM and HCO is best attributed to:
a combination of natural processes and human activities
human activities
natural processes
political factors
When did the impact of human activities really start to take effect on global forests?
during the Industrial Revolution
post WW2
during the Agricultural Revolution
from 1960s
Which of these systems of forest management would have the largest impact on changing the land cover?
selection
group selection
seed tree retention
clearfelling
What is forest degradation?
forests subjected to modification through human activities such as selective logging, replanting and fuelwood collection >10-30% remaining forest cover
forests cleared of all vegetation
forests cleared of all vegetation then replanted
< 10-30% remaining forest cover
What is deforestation?
long term reduction of tree canopy to < 10-30% cover
short term reduction of tree canopy to > 30% cover
temporary removal of some vegetation
subsistence farming
How does fragmentation affect forested areas?
periphery of cleared areas become degraded
loss of ecosystems
fragmented forest sections isolated from each other, preventing movement of plants and animals
all of the above
net forest change can be calculated by
the difference in net forest loss and net forest gain (through afforestation)
the amount of human activity present
deforestation over time
afforestation over time
Today, forests cover approx what % of land's surface?
20.6%
30.6%
40.6%
50.6%
Before the Agricultural Revolution, what % of the land surface was estimated to be forest cover?
17%
27%
37%
47%
Over the last 5000 years, human activities have been responsible for approximately how many billion hectares of forest?
1
1.9
3
5
Roughly 70% of all the original temperate forests had been lost by:
1920
1930
1940
1950
What was the main reason for the initial large scale loss of forest in the tropics in 1850s-1920s?
urbanisation
slash and burn techniques
local people farming
colonisation
During the mid 20th century, what characterised deforestation trends?
slowing down in temperate regions, accelerate in tropical regions
slowing down in tropical regions and temperate regions
speeding up in both tropical and temperate regions
slowing down in the tropics
The FAO estimates that net rate of forest loss between 2010-15 (3.3 million hectares/year) is how much less than the rate of the previous 20 years?
it's the same
half
a third
three quarters
What is the greatest cause of deforestation world wide?
logging
agriculture
subsistence farming
fuelwood collection
Which of these are examples of human activities causing deforestation
corruption, government food subsidies
improving infrastructure, urbanisation
illegal logging
subsistence farming, fuelwood collection, conversion to cropland
Which of these in NOT an example of natural processes causing deforestation:
pest invasions, disease outbreaks
forest fires, climatic events, tectonic events
climate change and El Nino events
war, civil unrest, economic growth
