CBSE 2022 · Region 4 · Set 1 · Q5 · 2 marks
The figures given below show the results of a lab experiment in which two microbial species A and B belonging to same genus were grown in three petri dishes having same culture medium. In Petri dish-I, Species-A was grown alone for $\displaystyle 8$ weeks. In Petri dish-II, Species-B was grown alone for $\displaystyle 8$ weeks. In Petri dish-III, both the species were grown together with the same number as Petri dish-I and Petri dish-II for $\displaystyle 8$ weeks.
What conclusion will you draw from the graphs in terms of impact of interaction on growth? Explain, giving reason.
What conclusion will you draw from the graphs in terms of impact of interaction on growth? Explain, giving reason.Marking-scheme solution
Both the species (Species A and B) show better growth when grown together.
Both are benefitted from each other / They show mutualism.
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CBSE Class 12 Biology past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.