The organisms which are restricted to a narrow range of salinity are known as

Options

A. Salinosomes
B. Salinotolerants
C. Euryhaline
D. Stenohaline

Answer

To solve the question regarding organisms that are restricted to a narrow range of salinity, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Concept of Salinity**:
- Salinity refers to the concentration of salts in water. Different organisms have varying tolerances to salinity levels.

**Hint**: Remember that salinity is a measure of salt concentration in water, which affects the types of organisms that can thrive in that environment.

2. **Identify the Types of Organisms Based on Salinity Tolerance**:
- Organisms can be categorized based on their salinity tolerance:
- **Euryhaline**: Organisms that can tolerate a wide range of salinity.
- **Stenohaline**: Organisms that are restricted to a narrow range of salinity.

**Hint**: Focus on the prefixes "Eury-" (wide) and "Steno-" (narrow) to help remember the differences in salinity tolerance.

3. **Evaluate the Options Provided**:
- **Salinosomes**: Not a recognized category of organisms.
- **Salino-tolerant**: This term does not refer to a specific group of organisms.
- **Euryhaline**: These organisms can tolerate a wide range of salinity, which does not fit the question.
- **Stenohaline**: These organisms are indeed restricted to a narrow range of salinity.

**Hint**: Cross-reference the definitions of the terms with the question to identify which option aligns with the description of organisms restricted to narrow salinity ranges.

4. **Select the Correct Answer**:
- Based on the definitions and evaluations, the correct answer is **Stenohaline** organisms, as they are specifically defined as those that cannot tolerate a wide range of salinity.

**Hint**: Remember that "steno" indicates a limitation, which is key to identifying the correct answer.

### Final Answer:
The organisms which are restricted to a narrow range of salinity are known as **Stenohaline**.