CBSE 2025 · Region 1 · Set 2 · Q1 · 1 mark

Mohit performed an analysis of two different soil samples from two areas A and B. He recorded these results : Soil Sample A : Lignin $\displaystyle 40$%, Sugar $\displaystyle 10$%, Chitin $\displaystyle 45$%, Nitrogen $\displaystyle 5$% Soil Sample B : Lignin $\displaystyle 5$%, Sugar $\displaystyle 35$%, Chitin $\displaystyle 15$%, Nitrogen $\displaystyle 45$% Which of these is true about their rate of decomposition in both the soil ?

CBSE Class 12 Biology past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.