Question

answer the question in brief no 14

Answer 1

Thus, the flow of energy in the ecosystem is said to be unidirectionalbecause the energy lost as heat from the living organisms of a food chaincannot be reused by plants in photosynthesis. During the transfer ofenergy through successive trophic levels in an ecosystem, there is a loss of energy all along the path.
Explain. Several pesticides are either washed down into the soil or into the water bodies. From the soil, these are absorbed by the plants along with water and minerals, and from the water bodies these are taken up by aquatic plants and animals. This is oneof the ways in which they enter thefood chain.
this is the answer.

Answer 2

1.Because the energy moves progressively through the various trophic levels and is no longer available to the previous trophic level. The energy captured by autotrophs does not revert back to the solar input.
2.Pesticides, used for crop rotection when washed down into the soil/water body, are absorbed by the plant/producer along with water and minerals.
3.Being non-biodegradable these chemicals get accumulated progressively in the food chain and enter our body.