Primitive anaeobic organisms that depended upon organic molecules of broth or hot dilute soup were

Options

A. Autotrophs
B. Chemoheterotrophs
C. Photoautotrophs
D. Heterotrophs

Answer

To solve the question about primitive anaerobic organisms that depended upon organic molecules of broth or hot dilute soup, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking about primitive anaerobic organisms that rely on organic molecules found in a broth or a hot dilute soup.

2. **Analyze the Options**: The options provided are:
- Autotrophs
- Chemoheterotrophs
- Photoheterotrophs
- Heterotrophs

3. **Define Each Option**:
- **Autotrophs**: These organisms can produce their own food using inorganic substances. They do not rely on organic molecules, so this option is incorrect.
- **Chemoheterotrophs**: These organisms obtain energy by consuming organic molecules. They rely on external organic sources for their nutrition, making this option a strong candidate.
- **Photoheterotrophs**: These organisms can use sunlight for energy but still require organic compounds for growth. However, they are not the primary focus of the question, which is about anaerobic organisms.
- **Heterotrophs**: This term refers to organisms that cannot produce their own food and must consume other organisms. While this is a broad category, it does not specifically address the type of organisms mentioned in the question.

4. **Identify the Correct Answer**: Given that the question specifies primitive anaerobic organisms that depend on organic molecules, the most appropriate answer is **chemoheterotrophs**. These organisms fit the description as they rely on organic molecules for energy.

5. **Conclusion**: Therefore, the correct answer to the question is **chemoheterotrophs**.