What percentage of energy is typically transferred from one trophic level to the next in an ecosystem?

• A. 10%
• B. 75%
• C. 50%
• D. 25%

Answer: (A)

Verified step by step guidance

1. Understand the concept of energy transfer in ecosystems: Energy is transferred from one trophic level to the next, but not all energy is passed on. This is due to energy being lost as heat, used for metabolic processes, or not consumed.
2. Learn about the 10% rule: In ecological studies, it is commonly observed that only about 10% of the energy from one trophic level is transferred to the next. This is known as the 10% rule.
3. Consider the implications of the 10% rule: This means that if a primary producer (like a plant) has 100 units of energy, only about 10 units will be available to the primary consumer (like a herbivore).
4. Apply the 10% rule to the given options: Compare the percentage options provided (10%, 75%, 50%, 25%) with the 10% rule to determine which one aligns with typical energy transfer in ecosystems.
5. Conclude with the correct understanding: Recognize that the 10% rule is the standard percentage of energy transfer between trophic levels, making 10% the correct answer.