Question

Two types of 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 supplied with fertilizers.
Answer the questions based on the fact given above:
(i) Name the organisms depicting the pattern A and B.
(ii) State the reason for the growth pattern seen in A.
(iii) Write the effects of the growth patterns seen above.

Answer 1

(i) A- Algae / planktonic or free-floating algae
B - Fish or aquatic animals.

(ii) Due to excessive loading of nutrients / fertilizers from adjacent agriculture land resulting in increase in nutrients.

(iii) Decrease in dissolved oxygen, increase in biological oxygen demand (BOD), fish mortality and unpleasant odour.