1
Question
Match column A with column B and choose the correct option.
Column A
Column B
I. Humification
a. Percolation of water soluble inorganic nutrients into the soil
II. Leaching
b. Organic matter formed at consumer level
III. Secondary productivity
c. Process of decomposition of detritus to form a nutrient-rich dark coloured, amorphous substance
Match column A with column B and choose the correct option.
| Column A | Column B |
| I. Humification | a. Percolation of water soluble inorganic nutrients into the soil |
| II. Leaching | b. Organic matter formed at consumer level |
| III. Secondary productivity | c. Process of decomposition of detritus to form a nutrient-rich dark coloured, amorphous substance |
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Solution
The correct option is C I - c, II - a, III - b
Productivity is an important functional feature of an ecosystem. It is the rate at which organic matter/biomass is produced per unit area over a time period.
Primary productivity refers to the rate of production of organic matter, by the process of photosynthesis, per unit area.
Secondary productivity is the rate at which the consumers/heterotrophs synthesise new organic matter per unit area.
Another important function of the ecosystem is the decomposition or breakdown of complex organic materials present in dead remains of plants and animals into simple inorganic compounds.
Decomposition of detritus is a function of 5 different processes such as - fragmentation, leaching, catabolism, humification and mineralisation.
Fragmentation, leaching and catabolism work simultaneously on the detritus.
Leaching is one of the processes involved in the process of decomposition. Water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts. This process is called Leaching.
Humification is the process of decomposition of detritus to form humus which is a nutrient-rich, dark coloured, amorphous organic matter. Being highly resistant to microbial action, humus decomposes very slowly to release nutrients into the soil. Humus is a huge reservoir of nutrients.
Productivity is an important functional feature of an ecosystem. It is the rate at which organic matter/biomass is produced per unit area over a time period.
Primary productivity refers to the rate of production of organic matter, by the process of photosynthesis, per unit area.
Secondary productivity is the rate at which the consumers/heterotrophs synthesise new organic matter per unit area.
Another important function of the ecosystem is the decomposition or breakdown of complex organic materials present in dead remains of plants and animals into simple inorganic compounds.
Decomposition of detritus is a function of 5 different processes such as - fragmentation, leaching, catabolism, humification and mineralisation.
Fragmentation, leaching and catabolism work simultaneously on the detritus.
Leaching is one of the processes involved in the process of decomposition. Water soluble inorganic nutrients go down into the soil horizon and get precipitated as unavailable salts. This process is called Leaching.
Humification is the process of decomposition of detritus to form humus which is a nutrient-rich, dark coloured, amorphous organic matter. Being highly resistant to microbial action, humus decomposes very slowly to release nutrients into the soil. Humus is a huge reservoir of nutrients.
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