6.3.2 - Populations and Sustainability Review Questions And Answers
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6.3.2 - Populations and Sustainability
Institution
6.3.2 - Populations And Sustainability
Describe a peat bog ecosystem - ️️Partially decomposed organic matter created in wetland environments that are acidic & anaerobic
They are a major carbon sink
They are an important water store - provides ¾ of our drinking water
They are home to lots of different plants & animals
Describe s...
6.3.2 - Populations and Sustainability
Describe a peat bog ecosystem - ✔ ✔ Partially decomposed organic matter created in wetland
environments that are acidic & anaerobic
They are a major carbon sink
They are an important water store - provides ¾ of our drinking water
They are home to lots of different plants & animals
Describe sustainable methods used in woodland ecosystems - ✔ ✔ For every tree cut down, a new
one is planted in its place
Trees are cleared in patches as woodland grows back more quickly in small areas between existing
woodland
Timber is often harvested by coppicing - tree trunk is cut close to the ground to encourage new growth
Describe the Galapagos islands - ✔ ✔ Small group of islands in the Pacific Ocean
Many rare species of plants & animals
What problems have humans caused to the Galapagos Islands?
Non-native animals & plants introduced to the islands
Many native species have been eaten - both plant & animals
Describe the Lake District & Snowdonia National Park - ✔ ✔ Areas of hills & lakes in the UK - millions
of visitors each year
Describe the Maasai Mara region - ✔ ✔ It is a national reserve in Kenya, consisting mostly of
grassland.
Describe the Terai Arc region - ✔ ✔ Area of forest & grassland on the border between Nepal & India
~ 7 million people live there
Explain and justify sustainable management - ✔ ✔ allows biodiversity to be maintained whilst
allowing economic benefits to be derived
ensures natural resources will still be available for future generations
, Explain and label the growth curve: - ✔ ✔ -Slow growth as the initial small number of individuals
build up their numbers
-Rapid growth as the number of individuals keep reproducing. Resources are plentiful.
-Stable state as the number of resources becomes a limiting factor for population size
there are not enough resources for the whole population.
The population then begins to decline.
A smaller population means there is less competition for space and food, which is better for growth &
reproduction.
The population starts to grow again
How do we conserve ecosystems? - ✔ ✔ Protection - natural resources in them can be used by do
not run out
Management - how resources are used and replaced
Reclamation - restoring ecosystems that have been damaged or destroyed
How do we preserve ecosystems? - ✔ ✔ banning or restricting humans from an ecosystem
Limited tourism & scientific research
No mining or other industrial activities allowed
Identify the practical difficulties that might prevent your two measures from being effective - ✔ ✔
Area too large, expense of monitoring, monitoring hampered by weather, false reporting of
catches/trawler size/days at sea
Death of fish caught but not kept (because of restrictions)
Suggest two measures that an international treaty might impose, to prevent fishing from causing
permanent damage to the Southern Ocean. - ✔ ✔ Fishing quotas, mesh size, species restriction,
trawler size/days at sea, penalties, monitoring/surveillance, public education
What abiotic (non-living) factors affect population size and why? - ✔ ✔ Abiotic factors, e.g. amount
of light, water, space, temperature, chemical composition
When abiotic factors are ideal a species can grow fast & reproduce successfully & vice versa
What animals are present in the forest? - ✔ ✔ Bengal tiger, Asian elephant + Indian rhino
What animals are present on the grasslands? - ✔ ✔ Wildebeest, zebra, lions & cheetahs
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