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LGS A-Level OCR Biology - Unit 6 - Ecosystems Part 4

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This flashcard deck covers key concepts from Unit 6 of the OCR Biology A-Level syllabus, focusing on ecosystems. Topics include the nitrogen cycle, transects, and primary productivity.

Denitrification

Conversion of soil nitrates to atmospheric nitrogen. Carried out by denitrifying bacteria in anaerobic conditions (e.g. waterlogged soil) who use the nitrates as the final e- acceptor in respiration instead of O2
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Key Terms

Term
Definition
Denitrification
Conversion of soil nitrates to atmospheric nitrogen. Carried out by denitrifying bacteria in anaerobic conditions (e.g. waterlogged soil) who use the ...
Human activities affecting the nitrogen cycle
Use of fertiliser - neutrification, algae use up all the oxygen
Processes removing atmospheric nitrogen
Nitrogen fixation by bacteria; Atmospheric fixation; Haber process
Processes adding to atmospheric nitrogen
Denitrification
Similarities in nitrogen and carbon cycles
Involves plants and animals; Involves anaerobic respiration (decomposers); Both cycles involve atmospheric chemicals
Differences in nitrogen and carbon cycles
Involves sea in cc; No fixation of CO2; Only uses organic processes in cc; N is fixed by bacteria vs on plants

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TermDefinition
Denitrification
Conversion of soil nitrates to atmospheric nitrogen. Carried out by denitrifying bacteria in anaerobic conditions (e.g. waterlogged soil) who use the nitrates as the final e- acceptor in respiration instead of O2
Human activities affecting the nitrogen cycle
Use of fertiliser - neutrification, algae use up all the oxygen
Processes removing atmospheric nitrogen
Nitrogen fixation by bacteria; Atmospheric fixation; Haber process
Processes adding to atmospheric nitrogen
Denitrification
Similarities in nitrogen and carbon cycles
Involves plants and animals; Involves anaerobic respiration (decomposers); Both cycles involve atmospheric chemicals
Differences in nitrogen and carbon cycles
Involves sea in cc; No fixation of CO2; Only uses organic processes in cc; N is fixed by bacteria vs on plants
Use of transects
Look for changes in vegetation across a habitat
Types of transects
Line | Belt
Line transect
At reg. intervals | Note of which species are touching the tape
Belt transect
At reg. intervals; Place a quadrat next to the line (interrupted belt transect) or move the quadrat along the line (continuous); Used to sample succession
Estimating pop. size
Mean number of a species in a quadrat/ faction of the total habitat area covered by a single quadrat
Deciding how many samples to take
In a pilot study take random samples looking at species distribution; Plot quadrat number against cumulative frequency; When curve levels off use that number of quadrats
Units to measure primary productivity on land
gm-2 yr-1
Units to measure primaary productivity in water
gm-3 yr-1
Decomposes in the nitrogen cycle
Pass urea to next stage