Which of the Following Human Actions Is Most Apt to Result

question 22

Multiple Choice

Which of the following human actions is most apt to result in a long term increase in soil pH?

• A)application of NH₄^- containing fertilizers
• B)application of farm manure
• C)irrigation with high sodium salt-containing waters
• D)emission of gases from automobiles
• E)application of unlimed sewage sludge

---

Definitions:

Sensory Adaptation

The process by which sensory receptors become less responsive to constant stimuli over time.

Absolute Threshold

The minimum intensity of stimulation that must occur before you experience a sensation.

Detection Threshold

The minimum level of intensity at which a stimulus is perceived or detected by the sensory system.

Just Noticeable Threshold

The minimum difference in stimulation that a person can detect 50% of the time; also known as the difference threshold.