Question

The first trophic level in a food chain is always green plant.why?

Answer 1

The first trophic level of the food chain is always occupied by green plants which are termed to be producers. This is because producers absorb sunlight, abiotic factor and fix it into food chain. This energy is transferred to organisms in other trophic levels of the food chain.
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Answer 2

Green plant are considered to be produced of food.They convert simple raw material to complex organic substance in the presence of sunlight and chlorophyll. hence,the green plant are placed in the trophic level.