BI-2230
Aerobic respiration
Biology · Secondary 4 · Hard · Aerobic respiration
A student compares two compost bins kept under the same conditions. Bin X contains only garden waste. Bin Y contains garden waste mixed with food scraps rich in protein and fat. The temperature in Bin Y rises higher and stays high for longer. Which statement best explains this difference?
- Decomposers in Bin Y respire faster because there is more easily decomposed food
- Bin Y has more oxygen because food scraps contain trapped air bubbles
- Protein and fat cannot be decomposed, so heat is trapped in Bin Y
- Garden waste in Bin X absorbs more heat, so the temperature stays lower
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