10.2 2 Energy transfers in ecosystems

Question 1

Gross primary productivity

Answer 1

in plants is the rate at which light from the sun catalyses the production of new plant material
unit= biomass/area/time

Question 2

Measuring productivity

Answer 2

difficult

finding the mass of representative samples of mass and multiplying up to represent whole ecosystem

Question 3

Net primary productivity

Answer 3

the material produced by photosynthesis stored as new plant body materials
other material goes towards metabolic needs that doesent count

Question 4

NPP=

Answer 4

GPP-R

Question 5

Dont forget

Answer 5

decomposers

Question 6

Limitations of energy efficency calculations

Answer 6

Need to be certain identified most abundant species in ecosytem need to know how many average body size how much energy body size prepresents and how much transferred to decompers
Seasons

Question 7

realtively little light falling on the earth

Answer 7

is used to produce plant material and very little material gets transferred thats why there is limited trophic levels and why tertiary must travel large areas