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WorksheetsEnergy Models (pyramids)
Total questions: 25
Worksheet time: 24mins
The approximate amount of energy that is transferred between each trophic level is:
10%
0.1%
90%
It totally depends on the ecosystem.
This bear scat is an example of:
decomposers
detritus
efficient energy use
an imbalance in the ecosystem
The ecological pyramid that shows the number of organisms that were counted at each trophic level is called a pyramid of (a)
An ecological pyramid that shows the total dry mass of all the living material at each trophic level of an ecosystem is called a pyramid of (a)
Which statements are true about a pyramid of energy?(check ALL that are correct)
A pyramid of energy shows the the energy available at each trophic level
shows that exactly 10% of energy is lost between each trophic level
It is the one type of ecological pyramid that is always shaped like a pyramid.
It must be drawn as a 3D model, never 2D
Consider the following food chain in the ocean:
phytoplankton --> zooplankton --> herring --> salmon
If the phytoplankton produce 40 000 000 kJ of energy per day, how much energy is available to the salmon?
400 000 kJ
40 000 kJ
4 000 000 kJ
4 000 kJ
The shark at the top of this pyramid is called a:
producer
primary consumer
secondary consumer
tertiary consumer
quaternary consumer
Why are there generally a maximum of five trophic levels?
It's far easier to draw a pyramid that way.
Because energy is lost at each level, there isn't enough energy left to support any more consumers.
Generally a top predator is so fierce it has no predators and therefore can rule the top trophic level without fear.
There simply is not a word beyond quaternary.
BTW the word after quaternary is quinary (always read all the options in multiple choice questions)
What are negative impacts of monocultures (cultivation of crops of a single species)? Check all that are correct.
Decrease in biodiversity
Decrease in the amount of nutrients in the soil
Decrease in world hunger
Decrease in water requirements
Scientific models like ecological pyramids are important because they allow scientists to make
(a)
An ecosystem has 1000 bushes and grasses that each produce 10 000 kJ of energy per day. How many rabbits can this ecosystem support if each rabbit requires 5 000 kJ of energy per day?
(a)
An ecosystem has 1000 bushes and grasses that each produce 10 000 kJ of energy per day. Foxes are secondary consumers in this ecosystem. How many foxes can be supported by the ecosystem if each fox requires 10 000 kJ of energy per day?
(a)
Which organism in the food web shown to the right would
contain the lowest concentration of chemical pollutants?
producers
primary consumers
secondary consumers
tertiary consumers
The phenomenon by which toxins concentrate in the organisms at higher trophic levels within an ecosystem is known as...
Biotoxicity
Biomagnification
Eutrophication
Predation
What is the ultimate source of energy for most organisms?
The Sun
The Earth
Plants
Producers
Which of the following correctly shows an energy pyramid?
A
B
C
D
Consider the following food chain:
Algae > Mayfly > Minnow > Trout
In a polluted ecosystem, which organism would likely have the HIGHEST level of toxic chemicals in its body?
Algae
Mayfly
Minnow
Trout
Energy can be
transformed
created
destroyed
lost completely
Which organism is often missing from a food web?
decomposers (detritivores)
carnivores
chemosynthetic bacteria
photoautotrophs
A quaternary consumer is at the (a) trophic level
An example of an organism that can convert an inorganic compound like hydrogen sulphide into a simple organic molecule like sugar:
tube worm
butterfly
chemosynthetic bacteria
phytoplankton
