A food chain is a linear sequence showing the flow of energy from one organism to another, while a food web is a complex network of interconnected food chains. Food chains are simpler and less realistic representations of energy flow in an ecosystem than food webs, which are more comprehensive.
Elaboration:
Structure:
Food chains are linear, showing a single path of energy transfer (e.g., grass -> grasshopper -> frog). Food webs, on the other hand, are interconnected, showing multiple feeding relationships and energy pathways within an ecosystem.
Realism:
Food chains are simplified models that don’t always accurately reflect the complexity of how organisms interact in real-world ecosystems, where many organisms consume various food sources. Food webs are more realistic as they capture the multiple feeding interactions and energy pathways within an ecosystem.