Energy transfers in ecosystems
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1
What is biomass?
Mass of carbon in an organism
2
How is biomass measured?
Dry mass per unit area
3
What is used to measure energy?
A calorimeter
4
What does burning biomass calculate?
Chemical energy content
5
What does temperature change indicate?
Energy released by burning biomass
6
What is GPP?
Total chemical energy in plants
7
What is NPP?
Energy available for growtheproduction
8
How is NPP calculated?
NPP = GPP - R
9
What does R represent?
Respiratory losses
10
What is net production for consumers?
N = I - (F + R)
11
What does "I" stand for in NPP?
Chemical energy ingested
12
What does "F" stand for in NPP?
Energy lost in fecesrine
13
What does "R" stand for in NPP?
Energy lost via respiration
14
What is energy transfer efficiency?
(Energy transfer ÷ Input energy) x 100
15
What is an example of NPP?
Grass = 20,000kJ; NPP = 12,000kJ
16
What are trophic levels?
Steps in a food chain
17
What is dry mass?
Biomass without water content
18
How is GPP energy used?
For respiration and NPP
19
What is secondary production?
Consumers’ biomass increase
20
What is primary production?
Plants' biomass production
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