The energy flow in the ecosystem is unidirectional. Sun is the
main source of energy. The amount of energy received differs in
amount as it depends upon the slope, cloud, latitude and
pollutants present in the atmosphere. The energy received in the
Varanasi of India is three times more than the energy received
in the Britain. Some part of the energy is used by the
producers. The rest is dissipated. The efficiency to conserve
energy is around 1 percent in the grasslands and savannah. It is
also similar in the mixed forests. It is higher in the modern
crops and sugarcane field. It ranges from the 5 to 10 percent.
The autotrophs are also known as the producers. They make the
food by the process of photosynthesis from the inorganic
materials. They not only make their food but also for the other
organisms. They absorb the energy from sun and convert into the
chemical energy. They release oxygen. The organic compounds
release energy during respiration. The organic compounds which
are formed play an important role i