Question

choose the correct answer. using the 10% rule when studying trophic pyramids, if the producers at the first trophic level produce 100 joules of energy, how much energy will end up in a carnivore at the third trophic level? 100 joules 25 joules 1 joule

Explanation:

Step1: Energy transfer to second - level

The 10% rule means that only 10% of the energy is transferred from one trophic level to the next. If producers at the first trophic level have 100 Joules of energy, the energy transferred to the second - level (primary consumers) is $100\times0.1 = 10$ Joules.

Step2: Energy transfer to third - level

To find the energy transferred to the third - level (carnivores), we take 10% of the energy at the second level. So, the energy at the third level is $10\times0.1=1$ Joule.

Answer:

1 Joule