In vitro describes something in glass such as a test tube or petri dish.

In vitro describes something in glass such as a test tube or petri dish.

• A. In glass such as a test tube or petri dish
• B. Within a living organism
• C. In a patient
• D. In vivo is 'within a living organism'

Answer: (A)

The concept being tested is describing experiments done outside a living organism. In vitro means in glass, referring to work performed in laboratory containers like test tubes or Petri dishes. This distinguishes it from processes happening inside a living body. That’s why the description matching this idea is “in glass such as a test tube or Petri dish.” The other options describe work inside a living organism or clinical contexts (within a living organism or in a patient), which is not in vitro. Note that modern in vitro work can also use plastic wells, but the core idea remains outside the organism in a controlled lab environment.

The concept being tested is describing experiments done outside a living organism. In vitro means in glass, referring to work performed in laboratory containers like test tubes or Petri dishes. This distinguishes it from processes happening inside a living body. That’s why the description matching this idea is “in glass such as a test tube or Petri dish.” The other options describe work inside a living organism or clinical contexts (within a living organism or in a patient), which is not in vitro. Note that modern in vitro work can also use plastic wells, but the core idea remains outside the organism in a controlled lab environment.