(i) In a food chain the energy moves progressively through the various trophic levels and is no longer available to the organisms of the previous trophic level/energy captured by the autotrophs does not revert back to the solar input.
(ii) Pesticides used for crop protection when washed away/down into the soil/ water bodies absorbed by
(iii)On consumption they enter our food chain and being non-biodegradable, these chemicals get accumulated progressively and enter our body.
