A field has 10,000 kJ of energy fixed by producers in a year. Assuming that about 10 percent of the energy passes to the next level, how much reaches the tertiary consumers in the chain producer, primary, secondary, tertiary?
Answer and explanation
Correct answer: D. About 10 kJ
- Step 1: Count the transfers: producer to primary, primary to secondary, secondary to tertiary. That is 3 transfers. Step 2. Each transfer keeps 10 percent, so kJ. Answer: about 10 kJ. Why not the others: Two transfers would give 100 kJ, one would give 1,000 kJ, and four would need another level.
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