Snow blindness is caused by

$A$ location with luxuriant growth of lichens on the trees indicates that the

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.

The release of phosphates and nitrates into water bodies (i.e., rivers and lakes) leads to:

Assertion : Inhabitants close to very busy airports are likely to experience health hazards.
Reason : Sound level of jet aeroplanes usually exceeds $160 \, dB$.

Acid rain is caused by .......