Distinguish between: Food chain and Food web

A diagrammatic representation of different trophic levels in an ecosystem is given below What is the difference between a food chain and food web? Which one is more stable?

Distinguish between controlled and uncontrolled chain reactions.

What is food web?

Soil pollutants affecting food chains and food webs by killing micro-organims are

Write note on Food chain?

Differentiate the following:food chain and food web