Give reasons for the following:
1. Protozoans help to improve the fertility of soil.
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Mineralization and Immobilization Protozoa play an important role in mineralizing nutrients, making them available for use by plants and other soil organisms. Protozoa (and nematodes) have a lower concentration of nitrogen in their cells than the bacteria they eat.
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Answer:
When they graze on bacteria, protozoa stimulate growth of the bacterial population (and, in turn, decomposition rates and soil aggregation.) ... Typical numbers of protozoa in soil vary widely - from a thousand per teaspoon in low fertility soils to a million per teaspoon in some highly fertile soils
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