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Worksheets10% Rule Practice Quiz
Total questions: 20
Worksheet time: 10mins
What is the 10% rule in energy transfer within a food chain?
Only 10% of energy is lost at each trophic level
Only 10% of energy is passed on to the next trophic level
10% of organisms survive at each level
10% of the population migrates to the next level
If a producer has 10,000 J of energy, how much energy will be available to the primary consumer according to the 10% rule?
1,000 J
100 J
10 J
10,000 J
According to the 10% rule, if a secondary consumer receives 10 J of energy, how much energy did the primary consumer have?
1 J
10 J
100 J
1,000 J
What percentage of energy is typically lost as heat at each trophic level in a food chain?
10%
50%
90%
100%
If a tertiary consumer receives 1 J of energy, how much energy did the producer originally have?
10 J
100 J
1,000 J
10,000 J
Which of the following best describes why the 10% rule limits the number of trophic levels in a food chain?
Energy is recycled at each level
Energy is lost as heat at each level
Organisms eat less at higher levels
There are more producers than consumers
A grassland ecosystem has 5,000 J of energy in the grass. According to the 10% rule, how much energy would be available to a hawk that is a tertiary consumer?
5 J
50 J
500 J
0.5 J
If a food chain starts with 2,000 J of energy in plants, how much energy would a secondary consumer receive?
2 J
20 J
200 J
1,000 J
A food chain consists of grass → rabbit → snake → hawk. If the grass contains 8,000 J of energy, how much energy does the snake receive?
8 J
80 J
800 J
8,000 J
If a primary consumer receives 150 J of energy, how much energy did the producer have, according to the 10% rule?
1,500 J
15 J
1,350 J
15,000 J
A food web has 12,000 J of energy at the producer level. According to the 10% rule, how much energy would be available to the secondary consumer?
1,200 J
120 J
12 J
12,000 J
If a quaternary consumer receives 0.1 J of energy, how much energy did the producer originally have?
1 J
10 J
100 J
10,000 J
A food chain has four trophic levels. If the producer starts with 6,400 J of energy, how much energy will the tertiary consumer receive?
6.4 J
64 J
640 J
0.64 J
If a secondary consumer receives 5 J of energy, how much energy did the primary consumer and producer have, respectively?
50 J and 500 J
5 J and 50 J
50 J and 5 J
500 J and 50 J
A food chain is as follows: algae → zooplankton → small fish → large fish. If the large fish receives 2 J of energy, how much energy did the algae originally have?
20 J
200 J
2,000 J
20,000 J
A student claims that if a producer has 1,000 J of energy, a tertiary consumer will receive 10 J. Is this correct? Explain your reasoning using the 10% rule.
Yes, because 1,000×0.1×0.1×0.1=1
No, because 1,000×0.1×0.1×0.1=1
Yes, because 1,000×0.1×0.1=10
No, because 1,000×0.1×0.1=10
Given a food chain: phytoplankton → zooplankton → small fish → large fish → bird. If the bird receives 0.1 J of energy, calculate the original energy in the phytoplankton.
1 J
10 J
1,000 J
10,000 J
A food web has 20,000 J of energy at the producer level. If there are four trophic levels, how much energy would be available to the top predator? Show your calculation.
20 J
200 J
2,000 J
2 J
If a secondary consumer in a food chain receives 25 J of energy, and the 10% rule applies, what is the minimum amount of energy the producer must have started with? Show your reasoning.
250 J
2,500 J
25 J
250,000 J
A food chain is: grass → grasshopper → frog → snake. If the snake receives 0.5 J of energy, how much energy did the grasshopper receive? Show your calculation.
0.05 J
0.5 J
5 J
50 J
