Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
|
What are slugs, worms and maggots an example of? |
Detrivorses |
|
|
What is leaching? |
Fertilisers washing off fields into rivers/lakes |
|
|
What do saprobients do? |
Break dead tissue, urine and faeces into ammonia |
|
|
What chemicals do nitrifying bacteria turn ammonia into |
NO2-, NO3- |
|
|
What percentage of the air is nitrogen? |
78% |
|
|
What type of plant can fix this into ammonia and why? |
Legumes, nitrogen fixing bacteria produce NH4+ |
|
|
What other two things add nitrate to the soil? |
Lightening, fertilisers |
|
|
What bacteria turns nirates back into nitrogen and in what conditions |
Dentrifying, anaerobic |
|
|
How do you calculate the efficiency of an energy transfer? |
% efficiency = energy BEFORE transfer/ energy AFTER transfer x.100 |
|
|
What is the issue with biomass pyramids? |
Same weight tissue holds different amounts of energy eg. Protein vs fat |
|
|
Why is energy lost at every stage? |
Some parts of plants can’t be digested eg. Cellulose Some energy is lost through respiratory losses eg. Heat and movement |
|
|
What is a disadvantage of a bomb calorifiter? |
Small size samples only can be used - not representative |
|
|
What is Gross primary production? |
Total chemical energy in plant biomass at a given time in a given area |
|
|
What does a bomb calorifiter sample have to be burnt in? |
Pure oxygen |
|
|
How do you calculate net primary production? |
NPP = GPP - respiratory losses |
|
|
What are biomass units? |
Kg/m2/year (Kgm-2/yr-1) |
|
|
Net production equation |
NPP = ingested food - (faeces and urine + respiratory losses) |
|
|
Faeces and urine goes to |
Decomposers who’s excremental also goes onto decomposers |
|
|
What are two examples of producers used to catch people out? |
Algae and phytoplankton |
|
|
How much of the suns energy is used by plants |
1-3% |
|
|
Why do they not absorb more? |
-some is reflected of leaves/ dust particles - can’t absorb all wavelengths - some is lost as heat energy - some hits not photosynthesising parts of the plant and passes through - other limiting factors for photosynthesis |
|
|
What factors limit photosynthesis? |
Temperature, co2, light intensity |
