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Title: F215 Ecosystems
Description: Simple but detailed notes, directly answering criteria on the specification for Ecosystems. Although, the OCR Biology spec has changed some topics may well be the same/similar. Please preview before purchase if interested.

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Tanisha Patel 

Ecosystems 
 
(a) define the term ecosystem;  
 
Non­living things and living organisms occurring in an area and the relationships between 
them 
 
(b) state that ​
ecosystems are dynamic systems
...
  
● Shown in a food web, arrows representing the flow of energy between organisms
...
The energy content of samples of organisms from each trophic level is measured  
2
...
The samples are weighed  
4
...
The energy produced passes to a known mass of water and the temperature rise of 
the water is measured  
6
...
Dry sand is blown inland, it is trapped by debris 
2
...
 
3
...
Dune grows into foredunes ­ they begin yellow but darken as humus (soil nutrients) is 
increased as plants die and decay
...
Colonisation continues and develops grey dunes 
6
...
 They change the microclimate to allow flowering plants ­ red fescue grass and 
creeping willow 
8
...
 This area is more suitable for some plant life with its high acidity, humus­rich 
and water
...
  
 
Belt transects ­  
Quadrats placed sequentially along line transect
...
 Each species present identified, and abundance 
of each is estimated  
 
Point quadrats ­ 
Frames with long pins
...
 Each species which touches a pin is 
recorded, along with number of times it is touched
...
 
They recycle materials such as Carbon and Nitrogen
...
 
 
(l) describe how microorganisms recycle nitrogen within ecosystems
Title: F215 Ecosystems
Description: Simple but detailed notes, directly answering criteria on the specification for Ecosystems. Although, the OCR Biology spec has changed some topics may well be the same/similar. Please preview before purchase if interested.