Decomposition and carbon recycling Quiz
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5 questions, one answer each
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1. How do saprobiotic fungi obtain nutrients?
- A. By photosynthesis
- B. By engulfing dead material
- C. By secreting enzymes and absorbing soluble products
- D. By feeding on living hosts
2. In which process is carbon dioxide fixed into organic compounds?
- A. Respiration
- B. Photosynthesis
- C. Decomposition
- D. Combustion
3. Why is decomposition very slow in a waterlogged bog?
- A. There are too many decomposers
- B. The pH is too high
- C. Low oxygen means aerobic decomposers are inactive
- D. Water denatures cellulose
4. What is released when decomposers respire the products they have absorbed?
- A. Oxygen
- B. Carbon dioxide
- C. Glucose
- D. Nitrogen
5. A compost heap stops decomposing at 70 degrees Celsius. Which explanation is best?
- A. Enzymes in the decomposers are denatured
- B. There is too much oxygen
- C. Cellulose becomes insoluble
- D. Decomposers photosynthesise instead