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Ecosystem - NCERT

An Ecosystem can be visualised as a functional unit ofnature, where living organisms interact among themselvesand also with the surrounding physical varies greatly in size from a small pond to alarge forest or a sea. Many ecologists regard the entirebiosphere as a global Ecosystem , as a composite of alllocal ecosystems on Earth. Since this system is too muchbig and complex to be studied at one time, it is convenientto divide it into two basic categories, namely theterrestrial and the aquatic. Forest, grassland and desertare some examples of terrestrial ecosystems ; pond, lake,wetland, river and estuary are some examples of aquaticecosystems.

organic substances and the rich soil deposit at the bottom of the pond. The solar input, the cycle of temperature, day-length and other climatic conditions regulate the rate of function of the entire pond. The autotrophic components include the phytoplankton, some algae and the floating, submerged and marginal plants found at the edges. The ...

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