The correct direction of energy flow in a food chain is :
Sun ----> Green Plants ----> primary consumers ----> secondary consumer--> Tertiary consumer
The flow of energy in the food chain starts from the sunlight down to the tertiary consumers, the green plants are the producers in the food chain making use of the energy it absorbs from the sun to produce its food. some percentage ( 10% ) of the energy absorbed by the producer is passed onto the primary consumer.
As we go down the food chain 10% of the energy stored in the previous level is transferred to the next level.
Hence we can conclude that The correct direction of energy flow in a food chain is :
Sun ----> Green Plants ----> primary consumers ----> secondary consumer--> Tertiary consumer
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