# Determine what is the maximum number of parasites that can feed in the host’s body if the mass of one parasite is 10 g

**Determine what is the maximum number of parasites that can feed in the host’s body if the mass of one parasite is 10 g, and 1 g of his body contains 200 kcal of energy. The owner is a herbivore with an average body weight of 40 kg, 1 kg of which contains 2000 kcal of energy. (The process of transformation of energy from one trophic level to another proceeds in accordance with Lindemann’s rule.)**

1) Let’s make a diagram of the food chain:

grass -> herbivore -> parasites.

2) Let’s calculate how much energy is contained in the body of one owner:

1 kg contains 2000 kcal 40 kg – x kcal x = 80,000 kcal.

3) Let’s calculate how much energy is contained in the body of one parasite:

1 g contains 200 kcal 10 g – x kcal x = 2000 kcal.

4) According to Lindemann’s rule, parasites will get 10% of the level energy from the herbivorous animal, i.e.

80,000 kcal: 10 = 8,000 kcal.

5) Let’s calculate how many parasites can feed on one host:

8000 kcal: 2000 kcal = 4.

Answer: 4 parasites.