3.5.3 energy and ecosystems

Question 1

define biome

Answer 1

a large naturally occurring community of flora and fauna occupying a major habitat

Question 2

define productivity

Answer 2

the rate at which energy is stored in crops and livestock but can also mean the rate at which biomass is added

Question 3

how can efficiency be increased?

Answer 3

simplifying the food web
energy lost through respiration in livestock can be reduced

Question 4

define gross primary production

Answer 4

chemical energy store in plant biomass, in a given area or volume

Question 5

define net primary production

Answer 5

chemical energy store in plant biomass after respiratory losses to the environment have been taken into account

Question 6

what is the equation linking net primary production, gross primary production and respiratory loss?

Answer 6

NPP = GPP - R

Question 7

what are the two ways pest control can be managed?

Answer 7

chemical and biological

Question 8

how does chemical pest control work?

Answer 8

insecticides kill insect pests
herbicides kill weeds which compete with the crop plant for light energy