The natural interconnections of food chain is :

Food web

The correct answer is Option (3)- Food web

C) Food web

A food web represents the natural interconnections of food chains within an ecosystem. A food web illustrates the various food chains within an ecosystem and how they overlap and intersect. It shows how different organisms are interconnected through multiple feeding relationships, providing a more comprehensive picture of the energy flow and interactions within an ecosystem. The food web effectively demonstrates the complexity and interconnectedness of different food chains. Unlike a food chain, which illustrates the transfer of matter and energy from one organism to another in a linear sequence, a food web provides a more comprehensive view of how multiple food chains are interconnected within an ecosystem. It highlights the intricate nature of feeding relationships by showing that most organisms either consume or are consumed by more than one species, a feature that food chains often fail to capture.

 A) GFC (Grazing Food Chain)

The Grazing Food Chain (GFC) starts with producers (typically plants) that are consumed by herbivores, which are then eaten by carnivores. While it represents one type of food chain, it doesn't encompass the interconnectedness of multiple food chains.

B) DFC (Detritus Food Chain)

The Detritus Food Chain (DFC) starts with dead organic matter, which is consumed by decomposers like bacteria and fungi, and then followed by detritivores. Similar to the GFC, it represents a specific type of food chain but not the complex network of multiple food chains.

D) Biomass

Biomass refers to the total mass of all living organisms in a given area or ecosystem at a certain time. It is a measure of the amount of living material but doesn't represent the interconnected relationships of food chains.