How much energy is available at the third trophic level if the first trophic level has 300,000
kilocalories of available energy and the loss rate between trophic levels is 90 percent?
A. 300.000 kilocalories
B. 30,000 kilocalories
C. 3000 kilocalories
. 300 kilocalories

The answer is C

Explanation:

It is given that every trophic level wil lose 90% rate of kilocalories. So we know that every level will only gain 10% of kilocalories and we can do it step by step :

First trophic level,

300 000 kilocalories

Second trophic level, gain only 10%

(10/100) × 300 000

= 30 000 kilocalories

Third trophic level,

(10/100) × 30 000

= 3000 kilocalories

(Hope you can understand)

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