How much energy is consumed from one trophic level to another trophic level?

Energy and nutrients flow from one trophic level to another in an ecosystem. Which one of the following statements correctly describes the direction of flow of energy and nutrients in an ecosystem?

The increase in concentration of toxic substances in successive trophic level is referred to as

_____ are present in the first trophic level in the food chain.

The flow of energy in an ecosystem is

Which of the following limits the number of trophic levels in a food chain ?