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Biology · 2025 · 1 mark
CBSE 2025 · Region 1 · Set 2 · Q1
Mohit performed an analysis of two different soil samples from two areas A and B. He recorded these results: Soil Sample A: Lignin 40%, Sugar 10%,…
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 ?
Official answer
(A)
Soil A has a slower rate of decomposition than Soil B.
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CBSE Class 12 Biology past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.