Explain how an oligotrophic lake can become eutrophic. What will be an ideal ...

Answer to q. 1

An oligotrophic lake is poor in nutrients and organic matter. Therefore, as nutrients and organic matter
accumulate, a lake can become eutrophic. Nutrients added to a lake, for example, in runoff, can cause a
lake to become eutrophic. Eutrophication is also a natural process where sediments accumulate over
long periods of time.

Answer to q. 2

Hydrogen sulfide from the hot water vents serves as an energy source for autotrophic bacteria. These
bacteria act as primary producers for the ecosystem, sometimes residing as endosymbionts in larger
organisms.

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