Question

if each level in a food chain typically loses 90 percent of the energy it takes in, and the producer level uses 1000 kcal of energy, how much of that energy is left after the... a) second trophic level?

Answer 1

100 kcal

Step-by-step explanation:

If the primary trophic level is producers and they have 1000 kcal then the second trophic level (primary consumers) will get 100 kcal of energy from eating those producers according to the rule of 10's (rule of tens is the same as 90% lost per trophic level)

Following the rule of 10's the third trophic level (secondary consumers) would get 10 kcal from the initial 1000 kcal after eating the primary consumer.

4th (tertiary consumers) would get .1 kcal of the original 1000 kcal

Hope this helps! :)