# In the food chain, the transition of energy from the first trophic level to the second is 15%, and from the second to the third

In the food chain, the transition of energy from the first trophic level to the second is 15%, and from the second to the third – 10%. Calculate the increase in biomass (kg) at the third trophic level, if the first trophic level has accumulated 3 x 10 ^ 4 kJ of energy. 1 kg of biomass at the third trophic level stores 45 kJ of energy 1) Let’s make a diagram of the food chain:
Trophic level I – »Trophic level II -> Trophic level III.
2) Let’s calculate how much energy will go from trophic level I to level II:
3 • 10 ^ 4 kJ – 100% x kJ – 15% x = 4500 kJ.
3) Let’s calculate how much energy will pass from the II trophic level to the III level:
4500 kJ – 100% x kJ – 10% x = 450 kJ.
4) Let’s calculate the growth of biomass at trophic level III, if 1 kg of biomass contains 45 kJ of energy:
450 kJ: 45 kJ = 10 kg. Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.