Concept of Ecosystems

Environment and Ecology

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Consider the following statements:

1. Detritus food chain begins with dead organic matter.

2. Detritus food chain is made up of decomposers.

3. Decomposers are also known as saprotrophs.

Which of the above statements is/are correct?

1 only

1 and 2 only

2 and 3 only

1, 2 and 3

Biotic components in food chain - Detritus food chain :

This type of food chain starts from organic matter of dead and decaying animals and plant bodies from the grazing food chain.
Dead organic matter or detritus feeding organisms are called detrivores or decomposers.
The detrivores are eaten by predators.
In an aquatic ecosystem, the grazing food chain is the major conduit for energy flow.
As against this, in a terrestrial ecosystem, a much larger fraction of energy fl ows through the detritus food chain than through the grazing food chain.
Decomposers are also known as saprotrophs.