The experiments performed under controlled conditions in research laboratory are called

Options

A. in vivo
B. in vitro
C. phytotrons
D. in situ

Answer

To solve the question "The experiments performed under controlled conditions in research laboratory are called," we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Context**: The question asks about experiments conducted in a laboratory setting, specifically under controlled conditions.

2. **Identify Key Terms**: The terms "in vivo" and "in vitro" are crucial here. "In vivo" refers to experiments conducted within a living organism, while "in vitro" refers to experiments performed outside of a living organism, typically in a controlled laboratory environment.

3. **Analyze the Options**:
- **In vivo**: This option is incorrect because it involves experiments inside living organisms.
- **In vitro**: This option is correct as it refers to experiments conducted outside of living organisms, typically in a lab setting under controlled conditions.
- **Phytotrons**: While related to controlled environments for plant growth, this term refers specifically to enclosed greenhouses and does not encompass all laboratory experiments.
- **In situ**: This term refers to conservation efforts within natural habitats, which is not relevant to laboratory experiments.

4. **Conclusion**: Based on the definitions and analysis, the correct answer is "in vitro," which describes experiments performed under controlled conditions in a research laboratory.

### Final Answer:
The experiments performed under controlled conditions in a research laboratory are called **in vitro**.

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