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Agricultural Science Past Questions

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2506

Decomposition of soil organic matter is mainly caused by 

  • A. bacteria
  • B. algae
  • C. fungi
  • D. nematodes
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2507

The main factors responsible for rock weathering in the desert are high temperature and 

  • A. animal activity
  • B. water
  • C. wind
  • D. root growth
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2508

A difference between physical and chemical weathering is that

  • A. there is a change in the mineral composition of rock in physical weathering
  • B. the mineral composition of rock is changed in chemical weathering.
  • C. carbonation is necessary in physical weathering.
  • D. wind is necessary in chemical weathering.
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2509

Use the information below to answer this question.
In an experiment on soil porosity, the following results were obtained:
Volume of dry soil = 52cm³
Volume of water= 48cm³
Volume of soil and water=78cm³

Determine the volume of airspace in the soil sample.

  • A. 22cm³
  • B. 26cm³
  • C. 30cm³
  • D. 100cm³
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2510

Use the information below to answer this question.
In an experiment on soil porosity, the following results were obtained:
Volume of dry soil = 52cm³
Volume of water= 48cm³
Volume of soil and water=78cm³

Calculate the porosity of the soil sample

  • A. 28.21%
  • B. 42.31%
  • C. 45.83%
  • D. 61.54%
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