Ecosystem (part-2)

How energy flows in an ecosystem? What is the relation of thermodynamics with Ecosystem? How many marks carried by the chapter Ecosystem in class 12 board examinations? Why we study the chapter Ecosystem? How important the chapter Ecosystem? What is PAR? What is net productivity? What is ten percent law?

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Sun is the only source of energy for all ecosystems on Earth except for the deep sea hydro-thermal ecosystem, Of the incident solar radiation less than 50 per cent of it is photosynthetically active radiation (PAR). We know that plants and photosynthetic and chemosynthetic bacteria (autotrophs), fix suns’ radiant energy to make food from simple inorganic materials. Plants capture only 2-10 per cent of the PAR and this small amount of energy sustains the entire living world. So, it is very important to know how the solar energy captured by plants flows through different organisms of an ecosystem