Which one of the following equipmcnts is essentially required for growing microbes on a large scale, for industrial production of enzymes?

Options

A. BOD incubator
B. Sludge digester
C. Industrial oven
D. Bioreactor

Answer

To answer the question "Which one of the following equipments is essentially required for growing microbes on a large scale, for industrial production of enzymes?", we will analyze the options provided:

1. **BOD Incubator**: This equipment is primarily used for measuring the biochemical oxygen demand of water samples. It is not designed for large-scale microbial growth.

2. **Sludge Digester**: This is used in wastewater treatment to break down organic matter in sewage. It is not specifically used for the large-scale production of enzymes.

3. **Industrial Oven**: This equipment is typically used for baking or drying purposes and is not suitable for growing microbes.

4. **Bioreactor**: This is a specialized vessel designed for growing microorganisms on a large scale. Bioreactors provide a controlled environment for microbial growth, including the necessary conditions such as temperature, pH, and oxygen supply.

Based on the analysis of the options, the correct answer is:

**D. Bioreactor**

### Step-by-Step Solution:
1. **Identify the purpose of the equipment**: The question is about growing microbes on a large scale for enzyme production.
2. **Evaluate each option**:
- BOD Incubator: Not suitable for large-scale growth.
- Sludge Digester: Used for wastewater treatment, not enzyme production.
- Industrial Oven: Not designed for microbial growth.
- Bioreactor: Specifically designed for large-scale microbial cultivation.
3. **Conclude the best option**: The bioreactor is the only equipment that meets the requirements for large-scale microbial growth.