Abies, lizards and polar bear can tolerate (a) Wide range of temperature (b) Only a narrow range of temperature (c) Wide range of salinities

Options

A. (a) & (b)
B. (b) & (c)
C. (b) only
D. (a) & (c)

Answer

To solve the question regarding the tolerance of Abies (a genus of coniferous trees), lizards, and polar bears to temperature and salinity, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Organisms**:
- Abies refers to a group of coniferous trees, commonly known as fir trees.
- Lizards are ectothermic reptiles that depend on external environmental temperatures to regulate their body temperature.
- Polar bears are large mammals adapted to cold environments, primarily found in the Arctic.

2. **Temperature Tolerance**:
- Each of these organisms has specific temperature ranges in which they thrive:
- **Abies**: Typically found in cooler climates, they thrive in temperatures ranging from 10 to 20 degrees Celsius.
- **Lizards**: They are generally active in warmer temperatures, around 20 to 30 degrees Celsius, and become inactive or hibernate in colder temperatures.
- **Polar bears**: They are adapted to live in cold environments, with their optimal living conditions being around -1 to 0 degrees Celsius. They struggle to survive in warmer temperatures.

3. **Narrow Range of Temperature**:
- The organisms mentioned (Abies, lizards, and polar bears) exhibit a narrow range of temperature tolerance, meaning they cannot survive outside their specific temperature ranges. This categorizes them as **stenothermal organisms**, which can only tolerate a limited range of temperatures.

4. **Salinity Tolerance**:
- The question also mentions salinity. However, the organisms listed are not known for their ability to tolerate a wide range of salinities. For example, salmon can thrive in both freshwater and marine environments, showcasing a wide range of salinity tolerance, which is not applicable to the organisms in question.

5. **Conclusion**:
- Based on the analysis, the correct answer to the question is (b) Only a narrow range of temperature.

### Final Answer:
(b) Only a narrow range of temperature