The Cation Exchange Capacities of Alkaline Soils Are Generally Higher

question 32

Multiple Choice

The cation exchange capacities of alkaline soils are generally higher than those of acid soils (Vertisols excepted) .Which of the following characteristics of alkaline soils most likely accounts for this high CEC?

• A)high humus content
• B)high content of hydrous oxides of iron and aluminum
• C)high exchangeable calcium
• D)high exchangeable sodium content
• E)high content of 2:1 type clays

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Definitions:

Alveoli

Small air sacs in the lungs where gas exchange between the air and blood occurs.

Hilus

A part of an organ where blood vessels, nerves, and other structures enter or exit.

Oropharynx

A part of the pharynx situated between the soft palate and the epiglottis, involved in swallowing.

Nasopharynx

The upper part of the throat located behind the nose, which forms part of the respiratory system.