A majority of organisms which are restricted to a narrow range of temperature are called as:

Options

A. Stenothermal
B. Endothermal
C. Homeothermal
D. Eurythermal

Answer

To solve the question, "A majority of organisms which are restricted to a narrow range of temperature are called as:", we will analyze the provided options step by step.

### Step-by-Step Solution:

1. **Understanding the Question**:
- The question asks for a term that describes organisms that can only survive within a narrow temperature range.

2. **Analyzing the Options**:
- **Option A: Stenothermal**
- Definition: Stenothermal organisms are those that can survive only within a very narrow range of temperatures.
- Example: Penguins, which thrive in cold climates, and pythons, which have specific temperature requirements.

- **Option B: Endothermal**
- Definition: Endothermal organisms can regulate their body temperature based on the surrounding environment, allowing them to survive in a wider range of temperatures.
- Example: Birds and mammals, which can maintain their body temperature despite external changes.

- **Option C: Homeothermal**
- Definition: Homeothermal refers to the mechanism used by endothermal organisms to maintain a stable internal body temperature.
- Note: This term does not describe the organisms themselves but rather the process they use.

- **Option D: Ureithermal**
- Definition: Ureithermal organisms can survive across a wide range of temperatures.
- Example: Cows, goats, and humans, which can adapt to various environmental temperatures.

3. **Identifying the Correct Answer**:
- Based on the definitions provided, the term that best describes organisms restricted to a narrow range of temperature is **Stenothermal** (Option A).

### Final Answer:
**A. Stenothermal**