Choose the correct answer :
In which one of the following habitats , does the decimal temperature of soil surface vary most ?

Options

A. Desert
B. Grassland
C. Shrub land
D. Forest

Answer

To solve the question regarding which habitat has the most variation in the decimal temperature of the soil surface, we can analyze the characteristics of each habitat provided in the options.

### Step-by-Step Solution:

1. **Understanding Decimal Temperature**: Decimal temperature refers to the average temperature of the soil. The variation in this temperature can be influenced by several factors, including the type of soil, vegetation cover, and moisture content.

2. **Analyzing the Habitats**:
- **Desert (Option A)**: Deserts typically have loose, sandy soil that can heat up quickly during the day and cool down rapidly at night. This leads to significant temperature fluctuations.
- **Grassland (Option B)**: Grasslands have a mix of grasses and some roots, but they retain moisture better than deserts. The temperature variation is moderate.
- **Shrubland (Option C)**: Shrublands have more vegetation than grasslands, which helps to stabilize soil temperatures. The variation is less than that of grasslands.
- **Forest (Option D)**: Forests have dense tree cover, which provides shade and retains moisture in the soil. This leads to the least variation in soil temperature.

3. **Comparing the Variations**:
- Forests have the least variation due to their dense vegetation and moisture retention.
- Shrublands have slightly more variation than forests.
- Grasslands have more variation than shrublands.
- Deserts have the highest variation due to the loose sand that heats and cools quickly.

4. **Conclusion**: Based on the analysis, the habitat where the decimal temperature of the soil surface varies the most is the **Desert (Option A)**.

### Final Answer:
**A. Desert**