CBSE 2023 · Region 1 · Set 1 · Q4 · 1 mark
The graph plotted below is based on the data collected by biology students with respect to the levels of oxygen at the specific points in the river flowing outside their city. Which point in the graph indicates the entry of untreated sewage in the river ?
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Point (i)
Microbes in Human WelfareMicrobes in Sewage TreatmentAnalysemcqmedium
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CBSE Class 12 Biology past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.