Biology · Ecosystems · NEET
No. They are two different steps and NEET often swaps them to trap you. Humification makes humus (a dark, amorphous, colloidal substance that resists breakdown). Mineralisation comes AFTER: microbes slowly degrade that humus and release inorganic nutrients into the soil. Humus = built up. Minerals = released out.
Soil microbes, mainly bacteria and fungi, do mineralisation. Their enzymes degrade the humus and free the inorganic nutrients. Detritivores like earthworms only fragment detritus earlier in the process; they do not perform mineralisation.
Inorganic nutrients are released into the soil, for example carbon, nitrogen, phosphorus, potassium and calcium. These are the same minerals plants take up again through their roots, which is why mineralisation closes the nutrient cycle.
Decomposition is the WHOLE process of breaking dead matter into simpler inorganic substances. Mineralisation is just the LAST step inside decomposition, where humus is degraded and inorganic nutrients are released. So mineralisation is a part of decomposition, not the full process.
Yes. The order of decomposition steps is: fragmentation, then leaching, then catabolism, then humification, and finally mineralisation. Mineralisation comes at the very end and returns inorganic nutrients to the soil.
Match List I with List II: List-I: A. Decomposition B. Detritus C. Mineralisation D. Humification List-II: I. Accumulation of dark coloured amorphous colloidal substance II. Release of inorganic nutrients by the activity of microbes in soil III. Breaking down of complex organic matter into inorganic substances IV. Dead remains of plants and animals including fecal matter
Identify the correct statements: A. Detritivores perform fragmentation. B. The humus is further degraded by some microbes during mineralisation. C. Water soluble inorganic nutrients go down into the soil and get precipitated by a process called leaching. D. The detritus food chain begins with living organisms. E. Earthworms break down detritus into smaller particles by a process called catabolism.
Try the real previous-year questions from this chapter — each with the answer and a full solution.
Mineralisation is the process by which microbes degrade humus and release inorganic nutrients into the soil. It is the last step of decomposition.
It is a biological process. It is carried out by soil microbes (bacteria and fungi) whose enzymes release the inorganic nutrients.
It returns nutrients to the soil so plants (producers) can absorb and reuse them. This keeps nutrients cycling and supports new growth, which is why it matters for NEET nutrient-cycling questions.
Humification comes just before mineralisation. First humus is formed by humification, then microbes break that humus down during mineralisation.
No. Detritivores like earthworms only do fragmentation (breaking detritus into smaller pieces). Mineralisation is done by microbes, not detritivores.
