. The most crucial event in nature governing nutrient balance is


A. secondary production                                 B. primary production

C. gross production                                         D. nutrient cycling

 

Best Answer

(d)

The most crucial event in nature governing nutrient balance is nutrient cycling. Plants need nutrients from the soil to grow. Soil nutrients mostly come from the breakdown of mineral-bearing rocks and from organic matter, which comes from the decomposition of plants and animals. The nutrients that plants get from the soil are stored in all plant tissues. When these tissues fall to the ground they start to break down and together with decomposing dead insects, animals and animal feces, they are eventually re-incorporated into the soil by rainfall and earthworms. There, the organic matter is further broken down and slowly transformed to become nutrients that are available to growing plants (and the cycle continues).

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