Plants grow sparsely in arid regions of the world

Options

A. Only because of high temperature
B. Because no seeds fall on their soil
C. Because of several factors combining together
D. Because the soil is sandy

Explanation

### Step-by-Step Solution:

1. **Understanding the Question**: The question states that plants grow sparsely in arid regions of the world. This means that in these regions, plants are not densely packed but rather scattered.

2. **Identifying Characteristics of Arid Regions**: Arid regions are characterized by low rainfall, high temperatures, and specific soil types.

3. **Soil Composition**: In arid regions, the soil is often sandy. Sandy soil has a low water-holding capacity, which means it cannot retain moisture effectively. This is a crucial factor affecting plant growth.

4. **Nutrient Availability**: Besides water, plants require nutrients for growth. In arid regions, the soil typically lacks sufficient nutrients (humus and other chemical nutrients) that are essential for healthy plant development.

5. **Impact on Plant Growth**: Due to the combination of sandy soil and low nutrient availability, plants struggle to grow in these conditions. This leads to sparse vegetation as the environment does not support dense plant growth.

6. **Conclusion**: Therefore, the sparse growth of plants in arid regions can be attributed to the poor soil quality, characterized by sandy texture and low nutrient content, which together limit the ability of plants to thrive.