Pretest2 09

Pretest2 09 - Land and Life SSC 185 Pretest 2 1 Briefly...

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Land and Life SSC 185 Pretest 2 1. Briefly explain why soil biological activity is so important to agricultural productivity and, thus, world food security. 2. Chemical and physical weathering of parent materials (rocks) is critical to the formation of soils. Briefly describe each. a. Chemical weathering b. Physical weathering 3. Circle the correct answer True or False In an acid solution, the pH is always > 7.0 T F Microorganisms help soil formation by decomposing plant/animal residues which produce acids T F Topography of a landscape includes both slope and aspect T F Most microorganisms are aquatic, only living in saturated soils T F Soils formed on steep slopes are as deep and productive as those formed on flat terrain T F Grassland soils generally have more soil organic matter than forest soils T F Sodic soils contain too much Na + for most food crops T F 1 teaspoon of soil contains 100 million bacteria T F 4. Soils are similar when developed under similar soil forming factors. The five soil forming factors are:
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Pretest2 09 - Land and Life SSC 185 Pretest 2 1 Briefly...

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