Select the incorrect statements.
I. Earthworms break down detritus into humus by a process called mineralisation.
II. Water-soluble inorganic nutrients go
down into the soil horizon and get precipitated by a process called leaching.
III. Low temperature and anaerobiosis favour decomposition.
IV. Humus acts as a reservoir of nutrients.
V. The rate of decomposition is quicker if detritus is rich in lignin and chitin.

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I and V only

III, IV and V only

II, III and IV only

I, III and V only

answer is D.

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Detailed Solution

I. Earthworms break down detritus by fragmentation.
II. Water-soluble inorganic nutrients go down into the soil horizon and get precipitated by a process called leaching.
III. Decomposition is a largely oxygen-requiring process. Heat and moisture favor decomposition.
IV. Humus acts as a reservoir of nutrients.
V. The rate of decomposition is slower if detritus is rich in lignin and chitin

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