In a food chain, if 10,000 joules of energy is available to the producer, how much energy will be available to the secondary consumer to transfer it to the tertiary consumer?

According to the 10 percent law, only 10% of the energy available at each trophic level is transferred to the next trophic level. Therefore:

• Producer: 10,000 joules
• Primary Consumer: 10% of 10,000 joules = 1,000 joules
• Secondary Consumer: 10% of 1,000 joules = 100 joules
• Tertiary Consumer: 10% of 100 joules = 10 joules

Therefore, 100 joules of energy will be available to the secondary consumer to transfer to the tertiary consumer.