If primary producers are exposed to 1,000,000 Joules of sunlight, the amount of energy transferred to tertiary consumers will be:

1000 J

The correct answer is Option (2) - 1000 J

In an ecosystem, energy transfer between trophic levels (from producers to herbivores to carnivores, etc.) follows the 10% Rule. This rule states that only about 10% of the energy at one trophic level is passed on to the next level — the rest is lost as heat or used for metabolic processes.

Primary producers receive 1,000,000 J of sunlight.

Energy transfer through the trophic levels:

1. Producers → Primary Consumers:
   10% of 1,000,000 J = 100,000 J
2. Primary Consumers → Secondary Consumers:
   10% of 100,000 J = 10,000 J
3. Secondary Consumers → Tertiary Consumers:
   10% of 10,000 J = 1,000 J

So, actually, the correct answer is: 1000 J