Describe the difference between a food chain and a food web. which most resembles what is found in an ecosystem?

"A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another. ... Food webs consist of many interconnected food chains and are more realistic representation of consumption relationships in ecosystems."

Two damaging diseases are destroying Bananas, The black sigatoka disease the originated in Asia late 20th century and Gros Michel that is a export cultivar of bananas that was used up till the 1950s