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Answer Key
Grade 7 Science: Matter Cycling & Energy Flow in Ecosystems
1.
sun
2.
Producers/plants
3.
organisms
4.
Decomposers
5.
Photosynthesis
6.
Cellular respiration
7.
heat
8.
soil/decomposers
9.
from sun to producers to consumers; lost as heat at each transfer
10.
atoms recombine through photosynthesis, respiration, decomposition, and physical cycles
11.
process where producers use light, CO2, and water to make sugar and release oxygen
12.
process where cells break down food to release usable energy, producing CO2 and water
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