Question:

In a lake phytoplankton grow in abundance in

Updated On: Jun 14, 2022
  • littoral zone
  • limnetic zone
  • profundal zone
  • benthic region
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The Correct Option is B

Solution and Explanation

A typical lake has three distinct zones (limnetic, littoral and the benthic zone) of biological communities linked it to its physical structure. The littoral zone is the near shore area where sunlight penetrate all the way to the sediment and allows aquatic plants (macrophytes) to grow. The limnetic (or pelagic) zone is the open water area where light does not penetrate upto the bottom. Limnetic zone is the home of phytoplanktons (e.g., algae) and zooplanktons (e.g., crustaceans). Benthic zone (bottom of the lake) contains the flora and the fauna living at the bottom. Profundal zone refers to the deepest part of open water, which is relevant only in extremely deep lakes.
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Concepts Used:

Ecosystem

An ecosystem is a structural and functional unit of ecology where the living organisms come in to interact with each other and the surrounding environment.

Structure of the Ecosystem:

The structure of an ecosystem is distinguished by the organization of both biotic and abiotic components. This involves the distribution of energy in our environment. It also comprises the climatic conditions prevailing in that particular environment. 

There are two main components of the structure of an ecosystem, namely: 

  • Biotic Components
  • Abiotic Components

The biotic and abiotic components are interconnected in an ecosystem. It is an open system where the energy and components can flow through the boundaries.