What does the Decomposition NEET 2026 matching question ask?
Detritus is the raw material; decomposition is the breakdown process. This decomposition NEET 2026 question tests that distinction in Biology, Ecology and Environment. The question bank classifies it as medium difficulty and sets an expected solving time of 60 seconds, not a measured student average or an official time limit.
Match each List I term with its List II definition. Select the option containing all four correct pairs.
List I
List II
- I. Build-up of humus, a dark, amorphous, colloidal material.
- II. Liberation of inorganic nutrients through soil microbial activity.
- III. Conversion of complex organic material into inorganic substances.
- IV. Dead plant and animal material, together with faecal matter.
Answer choices
How do you establish all four matches?
Match each term to its full definition before selecting an answer-choice letter. The official solution distinguishes the overall breakdown process, its raw material, nutrient release and humus accumulation. These are related ideas, not interchangeable names or four compulsory sequential stages.
- Step 1: Decomposition matches III. Decomposition breaks complex organic matter down into inorganic substances, so A matches III. The definition describes the overall conversion, not the starting material.
- Step 2: Detritus matches IV. Detritus comprises dead plant and animal remains, including faecal matter. It supplies the raw material for decomposition, so B matches IV. Fallen leaves and animal remains are material being broken down, not the breakdown process.
- Step 3: Mineralisation matches II. Microbial degradation of humus releases inorganic nutrients. This release is called mineralisation, so C matches II. The defining feature is nutrient release, not humus accumulation.
- Step 4: Humification matches I. Humification is the accumulation of humus, the dark-coloured, amorphous, colloidal substance. Therefore, D matches I. “Amorphous” means without a definite shape; this description identifies humus, not dead remains generally.
The complete sequence is A-III, B-IV, C-II, D-I. The correct answer is option B. The answer-choice letter B is separate from the List I label B, which denotes detritus.
- Detritus: the material.
- Decomposition: the overall breakdown process.
- Humification: humus accumulation.
- Mineralisation: inorganic nutrient release.
Why is option D wrong when its first pair is correct?
Option D gets only its first pair right: A-III. A matching option must satisfy all four pairs. The method error is recognising the decomposition definition and stopping before checking the remaining entries.
- B-II is wrong: detritus is dead organic material, not inorganic nutrient release.
- C-I is wrong: mineralisation releases inorganic nutrients; humus accumulation describes humification.
- D-IV is wrong: dead remains and faecal matter describe detritus, not humification.
If the marking scheme awards four marks for a correct answer and deducts one mark for an incorrect answer, selecting B rather than D produces this difference. This is a conditional calculation, not evidence of how frequently students make the error.
Establish each pair independently, then compare the entire sequence with the options. One correct pair cannot validate an answer choice.
What term describes fallen leaves, dead insects and faecal matter?
The collective term is detritus, because the question identifies material rather than a process. This is original practice from the same chapter, not another verified NEET PYQ.
Question: A forest-floor sample contains fallen leaves, dead insect remains and animal faecal matter. What collective term describes this material?
Correct answer: B) Detritus. The question names the material available for breakdown, not the process acting on it.
If it instead asked about conversion of that complex organic material into inorganic substances, the relevant term would be decomposition. Check whether the wording names material or describes a change.
How do you distinguish humus accumulation from nutrient release?
Humus accumulation identifies humification; microbial release of inorganic nutrients identifies mineralisation. This is original practice from Ecology and Environment, not an additional past-paper question.
Question: Observation P records accumulation of dark, amorphous, colloidal humus. Observation Q records microbes degrading humus and releasing inorganic nutrients. Identify P and Q respectively.
Correct answer: B) Humification and mineralisation. Check each observation separately:
- P: accumulation of humus establishes humification.
- Q: microbial release of inorganic nutrients establishes mineralisation.
Option A reverses the assignments. Both words belong to decomposition, but their order is not interchangeable.
Recall check: cover the options and identify the outcome. Humus accumulation versus inorganic nutrient release is decisive, not merely the presence of microbes or organic matter.
Next step: photograph a doubt on NEET JEEnius AI and photograph any question you are stuck on and get a step-by-step solution across Physics, Chemistry and Biology (20 free a month).
Related on NEET JEEnius AI: Equilibrium NEET 2026: Ranking Salts by Molar Solubility.
Frequently asked questions
What is the correct answer to the decomposition NEET 2026 matching question?
The correct answer is option B: A-III, B-IV, C-II, D-I. Decomposition matches conversion of complex organic material into inorganic substances, while detritus matches dead plant and animal material, including faecal matter. Mineralisation matches inorganic nutrient release, and humification matches humus accumulation.
What is the difference between detritus and decomposition?
Detritus is dead plant and animal material, including faecal matter, that supplies the raw material for decomposition. Decomposition is the process that breaks complex organic material down into inorganic substances. Fallen leaves and dead insects are detritus, not decomposition.
How do I distinguish humification from mineralisation?
Humification is the accumulation of humus, a dark, amorphous, colloidal substance. Mineralisation is the release of inorganic nutrients through microbial degradation of humus. Identify the outcome: humus accumulation means humification; inorganic nutrient release means mineralisation.
Why is option D wrong in the decomposition matching question?
Option D correctly matches decomposition with the conversion of complex organic material into inorganic substances, but its other three pairs are wrong. It assigns nutrient release to detritus, humus accumulation to mineralisation, and dead remains to humification. A matching option is correct only when all four pairs are correct.