5-B energy transfer and nutrient cycles

Question 1

what is an ecosystem?

Answer 1

All the organisms living in a community and the nonliving (abiotic) conditions in the area

Question 2

What is biomass?

Answer 2

mass of living material in an organism

Chemical energy stored in plants

Question 3

What is dry mass?

Answer 3

method for measuring biomass
sample is put in an oven at a low temp weigh at regular intervals
when mass is constant the water is removed
mass of carbon is 50% of dry mass which can be scaled up to a population

Question 4

What is calorimetry?

Answer 4

estimates the amount of chemical energy stored in the biomass sample of dry biomass is burnt and energy released is used to heat the volume of water
Change in temperature is used to calculate the energy

Question 5

what is the equation for net primary production (NPP)?

Answer 5

NPP=GPP-R

Question 6

what is GPP?

Answer 6

gross primary production-the risk amount of chemical energy converted from light energy in plants in a given area

Question 7

what is R?

Answer 7

respiratory loss

50% of GPP is lost to environment as heat when plants respite

Question 8

what is NPP?

Answer 8

net primary production
remaining chemical energy which is available for plant growth and reproduction (it’s the biomass)
also the amount of energy available for next trophic level

Question 9

what is the equation for net production (NP)?

Answer 9

N=I - (F+R)