Food Webs
This is the main source of energy for most producers.
The sun
This level of an energy pyramid has the most energy
producers/bottom
what is a trophic level
step in the transfer of energy within an ecosystem
What do herbivores eat
plants
Which sphere contains all living things
biosphere
Arrows in a food web represent the flow of this?
The direction of energy flow
this is approximately how much energy gets transferred to the next trophic level
10%
which trophic level has the most biomass
producers
what do omnivores eat
plants and animals
This sphere contains all the water on Earth
Hydrosphere
This would be the result if all producers in an ecosystem died.
Energy flow would stop.
Consumers would die off.
This can happen to energy that is not transferred
lost as heat, metabolic processes, recycled as decaying matter
what is the third level in a typical food chain
secondary consumers
what do decomposers do
break down dead organic materials
This sphere includes rock and soil.
Geosphere
This is why food webs are more stable than food chains.
There are more connections between organisms in multiple ways.
This is why there are fewer top tier predators than producers
less energy is available as you move up the trophic levels
these are reason that energy decreases in higher trophic levels
energy is lost as heat and waste
give an example of a secondary consumer
frog, fox, snake
This sphere contains all the gases above the crust of Earth
Atmosphere
This is one way that humans can disrupt a food web.
pollution, habitat loss, overfishing, etc
Draw and label the four main levels of an an energy pyramid
producers, primary consumer, secondary consumer, tertiary consumers
grass, grasshopper, frog, snake
explain how decomposers support the energy cycle
break down and return nutrients to the soil for producers to use
describe one way that 2 of the spheres interact with each other
rain (hydro), provides water for plants (bio) to grow.