Which of the following statements is/are not true? I. Below ground detritus constitutes leaf lit...

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Which of the following statements is/are not true?
I. Below ground detritus constitutes leaf litter, dried plant parts, remains of animals, their droppings and excretions.

II. Above ground detritus mainly constitutes dead roots, underground dead animals, etc.

III. Decomposition completely disposes off the whole detritus.
IV. Humus is rich in chitin and lignin.
(a) I, II and III
(b) I, II and IV
(c) I and II
(d) II and III
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