CBSE Class 12-science Answered
Two types of aquatic organisms in a lake show a 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 facts given above.
(i) The no. of organisms of A goes constantly with time then it increases.
(ii) The no. of organisms of B is more than A but with time it decreases than A.
a) Name the organism depicting patterns A and B.
b) State the reason for the growth patterns seen in A.
c) Write the effects of the growth pattern seen above.
Asked by sunil2791 | 06 Feb, 2018, 02:29: PM
Expert Answer
(a) The pattern A is depicted by microorganisms and pattern B is depicted by fishes or any other aquatic organism.
(b) As the lake is adjacent to an agricultural land extensively supplied with fertilisers, the run-off water from the field will result in an increase in nutrients of the lake. Thus, the number of microorganisms will rise to degrade the available organic matter.
(c) As the microorganisms increase (depicted by pattern A), they cause a decrease in the dissolved oxygen content in water. As a result, there is a decrease in the number of aquatic organisms like fishes, etc. (depicted by pattern B).
Answered by Sheetal Kolte | 07 Feb, 2018, 12:34: PM
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