Grade 5 students model real ecosystems with food webs and the energy pyramid. Multiple choice and fill in the blanks practice the 10 percent rule, energy lost as heat, and the impact of removing top predators, helping Grade 5 learners explain balance in connected feeding networks here. Students analyze the 10 percent energy rule using energy pyramids and predict consequences when one species disappears from a Grade 5 ecosystem.
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Energy in Ecosystems
Part A: Multiple Choice
Circle the best answer for each question.
1. Why is a food web a better model than a food chain for an ecosystem?
A) It shows only one path of energy
B) It shows many connected feeding relationships
C) It shows only producers in the ecosystem
D) It shows only the top predator's diet
2. About how much energy passes from one level of an energy pyramid to the next?
A) About 10 percent
B) About 50 percent
C) About 90 percent
D) About 100 percent
3. What happens to most of the energy that is not passed up the energy pyramid?
A) It becomes new producers
B) It is lost as heat
C) It is stored in soil
D) It is recycled by the sun
4. If all the hawks were removed from a food web, what would most likely happen?
A) Plants would disappear quickly
B) Mouse and snake populations could grow too large
C) The sun would stop providing energy
D) Decomposers would stop working
Part B: Fill in the Blank
Write the correct answer on each line.
1. A diagram showing how energy decreases at each level is an energy pyramid.
2. Many connected food chains make up a food web.
3. About 10 percent of energy moves from one level to the next.
4. Most energy lost between levels is released as heat.
5. Removing one species from a food web can unbalance the whole ecosystem.
Energy in Ecosystems
★ Part A: Multiple Choice
Circle the best answer for each question.
1. Why is a food web a better model than a food chain for an ecosystem?
A) It shows only one path of energy
B) It shows many connected feeding relationships
C) It shows only producers in the ecosystem
D) It shows only the top predator's diet
2. About how much energy passes from one level of an energy pyramid to the next?
A) About 10 percent
B) About 50 percent
C) About 90 percent
D) About 100 percent
3. What happens to most of the energy that is not passed up the energy pyramid?
A) It becomes new producers
B) It is lost as heat
C) It is stored in soil
D) It is recycled by the sun
4. If all the hawks were removed from a food web, what would most likely happen?
A) Plants would disappear quickly
B) Mouse and snake populations could grow too large
C) The sun would stop providing energy
D) Decomposers would stop working
★ Part B: Fill in the Blank
Write the correct answer on each line.
1) A diagram showing how energy decreases at each level is an energy pyramid.
2) Many connected food chains make up a food web.
3) About 10 percent of energy moves from one level to the next.
4) Most energy lost between levels is released as heat.
5) Removing one species from a food web can unbalance the whole ecosystem.
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12-18 minutes
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