Question

in which of the following environments would you expect to find psychrophilic microorganisms?

in the human body
your refrigerator
in an arid hot desert
a hot spring or geyser

Explanation:

Define psychrophilic microorganisms

Psychrophiles are cold-loving microorganisms that have an optimal growth temperature of \(15^\circ\text{C}\) or lower, and can grow at temperatures close to \(0^\circ\text{C}\).

Evaluate the given environments

• in the human body: Typically \(37^\circ\text{C}\), which supports mesophiles.
• your refrigerator: Typically kept around \(4^\circ\text{C}\), which is a cold environment where psychrophiles (and psychrotolerant microbes) can survive and grow.
• in an arid hot desert: High temperature environment supporting thermophiles or xerophiles.
• a hot spring or geyser: Extremely high temperature environment supporting thermophiles or hyperthermophiles.

Answer:

• in the human body
• your refrigerator (Correct answer)
• in an arid hot desert
• a hot spring or geyser