Two types to aquatic organisms in a lake show specific growth patterns as shown below, in a brief period of time. The lake is adjacent to an agricultural land extensively with fertilisers.
Answer the question based on the facts given above :

(i) Name the organisms depicting the patterns A and B.
(ii) State the reason for the growth pattern seen in A.
(iii) Write the effects of the growth patterns seen above.

Explanation

(i) A Dissolved Oxygen - algae
B Biochemical oxygen demend - fish/aquatic animal.
(ii) Due to excessive loading nutrients of fertilizers from adjacent agriculture land resuting in increase in nutrients.
(iii) Decrease in dissolved, in increase in nutrients.
(iii) Decrease in dissolved oxygen, increase in BOD, fish mortality, unpleasant odour of Eutrophication.