Question

the sun deposited 10,000kj of energy to the grass in the forest. how many kj of energy will be passed on to the secondary consumers?
1kj
100kj
10kj
1000kj
10,000kj

Explanation:

Step1: Recall energy - transfer rule

In an ecosystem, about 10% of energy is passed from one trophic level to the next. Producers (grass) are at the first - trophic level, primary consumers are at the second trophic level, and secondary consumers are at the third trophic level.

Step2: Calculate energy passed to primary consumers

The grass (producer) has 10000 KJ of energy. The energy passed to primary consumers is 10% of 10000 KJ, which is $10000\times0.1 = 1000$ KJ.

Step3: Calculate energy passed to secondary consumers

The energy passed to secondary consumers is 10% of the energy of primary consumers. So it is $1000\times0.1=100$ KJ.

Answer:

100 KJ