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The various links or steps in a food chain at which the transfer of food and energy takes place are called trophic levels.
The producers form the first trophic level as they manufacture food. The primary consumers form the second trophic level, the secondary consumers form the third, and the tertiary consumers form the fourth trophic level.
Grass is the producer which is eaten by the grasshooper known as primary consumer. Then the grasshooper is eaten by shrew, secondary consumer and lastly shrew eaten up by owl, tertiary conusmer. 

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The various steps in the food chain where the transfer of food or energy take place.

grass is eaten by grass hopper . grass hopper is eatern by frog

here the grass is in 1st tropic lavel

grass hopper 2nd and

frog 3rd

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