Energy flow, pyramids and cycles Quiz
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5 questions, one answer each
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1. About what percentage of energy is passed to the next trophic level?
- A. 50 %
- B. 1 %
- C. 10 %
- D. 90 %
2. A producer captures 4000 kJ of energy. How much reaches the secondary consumer if 10 % is passed on at each step?
- A. 40 kJ
- B. 400 kJ
- C. 4 kJ
- D. 800 kJ
3. Which process adds carbon dioxide to the atmosphere?
- A. Photosynthesis
- B. Respiration
- C. Evaporation
- D. Condensation
4. Why are decomposers important?
- A. They make food by photosynthesis
- B. They are the top predators
- C. They break down dead remains and recycle nutrients
- D. They make rain
5. Which is the best reason why food chains rarely have more than five links?
- A. There are too few kinds of animal
- B. Too much energy is lost at each step, so little remains
- C. Animals only eat one kind of food
- D. Plants cannot support animals