Make up five power circuits. All of them should start with plants (their parts) or dead organic debris (detritus). The intermediate link in the first case must be an earthworm; in the second, a mosquito larva in a fresh water body; in the third – housefly; in the fourth – the larva of the May beetle; in the fifth – ciliate shoe. All food chains must end with a human. Suggest the longest chain options. Why does the number of links not exceed 6-7?
1) dandelion – detritus – earthworm – chicken – human;
2) detritus – mosquito larva – small roach – perch – pike – human;
3) detritus – house fly larva (adult fly) – dragonfly – chub – human;
4) pine (roots) – May beetle larva – wild boar – human;
5) detritus – ciliate slipper – carp fry – aquatic dragonfly larva – diving duck – human.
Approximately only 10% of the energy of the previous level is transferred to each subsequent trophic level. Therefore, the total amount of energy in food chains is falling rapidly.
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.