ecosystems

Question 1

give the term meaning the amount of energy taken in by an organism

Answer 1

gross productivity

Question 2

is population of a species a biotic/abiotic factor?

Answer 2

biotic

Question 3

is competition between species for resources a biotic/abiotic factor?

Answer 3

biotic

Question 4

how do plants alter their reproductive systems when there is a low light intensity

Answer 4

reproductive systems only operate when light intensity is at OPTIMUM

Question 5

what is gross productivity?

Answer 5

the solar energy absorbed by the producer

Question 6

how to calculate net production?

Answer 6

gross production - respiratory losses

Question 6

what is net production?

Answer 6

the amount of energy that is converted into biomass from the organism’s total energy intake

Question 7

how to calculate efficiency of energy transfer from 1 trophic level to the next?

Answer 7

net productivity of t level/net productivity of PREVIOUS t level
x100

Question 8

does efficiency of energy transfer between trophic levels increase/decrease as trophic levels increase?

Answer 8

INCREASES

Question 9

how to calculate net productivity of singular trophic level?

Answer 9

energy transferred/energy intake
x100

Question 10

why does using pesticides increase efficiency of plant agriculture (key phrase)

Answer 10

less biomass lost

Question 11

why does using fertilisers increase efficiency of plant agriculture (key phrase)

Answer 11

more energy from ecosystem used to grow

Question 12

how does agriculture limit the energy loss from producers to consumers (humans) (generally)

Answer 12

shortens food chain so less energy lost