Spraying $DDT$ on crops causes pollution of .......

Observe the figure and answer the following questions.
$(i.)$ What ecological term is used to describe the $DDT$ accumulation at different trophic levels?
$(ii.)$ List any one effect of $DDT$ accumulation on birds.
$(iii.)$ Will $DDT$ accumulation lead to eutrophication?
$(iv.)$ Does it affect the $BOD$?
$(v.)$ Name a disease caused by the accumulation of any heavy metal.

Higher $BOD$ indicates that...

Euro $II$ norms stipulate that sulphur be controlled at . . . . . . $ppm$ in diesel and . . . . . . $ppm$ in petrol.

In areas where $DDT$ is used extensively,the bird population declines significantly because...

Noise is: