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a
a-iii; b-iv; c-ii; d-i
b
a-iv; b-iii; c-ii; d-i
c
a-iv; b-ii; c-iii; d-i
d
a-i; b-iii; c-ii; d-iv
answer is B.
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Detailed Solution
Leaching - Percolation of water-soluble nutrients into soil horizonFragmentation - Breakdown of detritus into smaller fragmentsCatabolism - Degradation of detritus by bacterial and fungal enzymesHumification -Accumulation of dark coloured amorphous substance