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Class 12BiologyEcosystemDecomposition
Medium

Humus is

  • A
    Dark coloured amorphous organic matter rich in lignin
  • B
    Dark coloured organic matter rich in cellulose
  • C
    Both $(a)$ and $(b)$
  • D
    Red coloured substances rich in iron
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Class 12 Questions

Class 12

Biology Questions

Chapter

Ecosystem

Subtopic

Decomposition

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