Question
Download Solution PDFIdentify a dark-coloured amorphous substance that is highly resistant to microbial action and undergoes decomposition at an extremely slow rate.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct option is Humus.
Key Points
- Humus is an amorphous dark-coloured and colloidal substance which is highly resistant to microbial action.
- It undergoes decomposition at an extremely slow rate.
- It can also act as a bank for nutrients.
- The process that leads to the formation of humus is known as humification.
- Humus is further degraded by some microbes and the release of inorganic nutrients occurs through the process known as mineralisation.
Additional Information
- Chitin
- Chitin is the most abundant amino polysaccharide polymer occurring in nature and is the building material that gives strength to the exoskeletons of crustaceans, insects, and the cell walls of fungi.
- Carotenoids
- They are pigments in plants, algae, and photosynthetic bacteria. These pigments produce bright yellow, red, and orange colours in plants, vegetables, and fruits.
- Carotenoids act as a type of antioxidant for humans.
- Colloids
- A colloid is one of the three primary types of mixtures, with the other two being a solution and suspension. A colloid is a mixture that has particles ranging between 1 and 1000 nanometers in diameter, yet are still able to remain evenly distributed throughout the solution.
Last updated on Jun 13, 2025
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