# It has been established that 1 kg of tit mass (second-order consumers) contains 4000 kcal of energy, and the efficiency of photosynthesis

It has been established that 1 kg of tit mass (second-order consumers) contains 4000 kcal of energy, and the efficiency of photosynthesis in the forest is 1%. What is the maximum number of these birds with an average weight of 20 g that can feed in a community on the surface of which 2 x 10 ^ 7 kcal of solar energy is supplied? 1) Let’s make a diagram of the food chain:
foliage -> insects – > tits.
2) Let’s calculate how much solar energy is used in the process of photosynthesis:
2 • 107 kcal – 100% x kcal – 1% x = 2 • 105 kcal.
3) Let’s calculate how much energy is contained in the body of one tit:
1 kg (1000 g) contains 4000 kcal 20 g – x kcal x = 80 kcal.
4) According to Lindemann’s rule, when moving from one trophic level to another, 10% of the energy of the previous level is lost, that is, insects will receive 200,000 kcal from the foliage: 10 = 20,000 kcal, and tits – 2000 kcal.
5) Let’s calculate how many tits can feed in this community:
2000 kcal: 80 kcal = 25. 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.