In a terrestrial ecosystem, detritus food chain is a major conduit for energy flow.

The above given statement is true.

1. The term "trophic level" refers to each level in the food chain. 
2. The grazing food chain, also known as the predator food chain, and the detritus food chain, also known as the saprophytic food chain, are the two main food chains in the ecosystem. 
3. The dead organic matter, or detritus, is the first step in the detritus food chain. 
4. The grazing Food Chain serves as the primary energy transport in the ecosystem. 
5. However, in the terrestrial environment, the detritus food chain receives a far greater share of energy than the grazing food chain.

Hence, option A is the  correct answer.