Summary Populations and sustainability notes for Biology A level OCR
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Course
Populations and sustainability
Institution
OCR
Book
A Level Biology A for OCR Student Book
In depth revision notes covering the whole of populations and sustainability. The topic is broken down into the individual specification points, shown by the numbers used throughout.
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Populations and sustainability
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, 68 . . 2 POPULATIONS &
SUSTAINABILITY
·
Human population
growing exponentially
&
Birth rate ↑ Man
C
·
death rate
Because we're
fighting against
- ,
our limiting factors
factors affecting ;
BR : DR: -
·
economic ·
Age profile
conditions ·
life expectency
Populations ·
cultural ·
food supply
- pyramid religious ·
safe drinking
-
backgrounds water sanitation
·
Birth control ·
conflict
·
political healthcare
factors natural disasters
·
- increasing population .
More
People ii prereproductive
than postreproductive age
Key words :
capacity-maximum
carrying
Population size that can&
be maintained in a
Abiotic particular habitat
factors :
limiting factor a factor -
·
shelter that slows down the
·
light natural process
·
water
·
oxygen
·
uridity Biotic
factors :
~ accumulation competition
of toxic was te predators
temperature disease
·
·
·
food
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