Deep black soil is considered to be highly productive due to the high proportion of

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Earthworm

Clay and humus

Gravel and Ca 2+

Sand and Zn2+

answer is B.

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Detailed Solution

Concept: The high humus and clay content of deep black soil makes it productive. The organic matter that is found in soil is produced by the rotting and death of living organisms. Because they contain the greatest nutrients, these soils produce the most fruit.
Black soil is dirt that is dark brown or black in colour. The organic and clay components of the soil are what give it its black colour. It produces a lot of fruit since it is rich in humus and clay. It is the ideal soil for agricultural activities because of the significant quantity of organic matter contained in it..
Due to the height of the clay and humus, deep dark soil is advantageous. The decomposition and decay of living organisms contribute to the natural matter found in soil. These soils are the most ripe because they are the richest in nutrients.
Thus, the appropriate response choice (2) .

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