(a) Define ecosystem.

(b) Autotrophs are at the first level of food chain. Give reason.

(c) In a food chain of frogs, grass, insects and snakes, assign trophic level to frogs.




An ecosystem is made up of plants,animals and microorganisms living in an area together with non living components like climate,soil,rivers etc


A typical Ecosystem looks like

Ecosystem - Diagram - Teachoo.jpg


The first level of the food chain is always autotrophs since they do not consume other organisms instead they produce their own food through photosynthesis.


The food chain will be as follows:

Food Chain. - Teachoo.jpg


  • Grass is the primary producer.
  • Insects are primary consumers.
  • Frogs are secondary consumers.
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Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo