Succulents occur in

Options

A. Deserts
B. Tundra
C. Temperate deciduous forests
D. Tropical rain forests.

Answer

### Step-by-Step Solution:

1. **Understanding Succulents**:
- Succulents are plants that have adapted to survive in dry conditions. They store water in their leaves, stems, or roots, which allows them to endure prolonged periods without rainfall.

2. **Identifying the Environment**:
- The question asks where succulents occur. We need to evaluate the environments listed: desert, tundra, temperate deciduous forest, and tropical rainforest.

3. **Analyzing Each Environment**:
- **Desert**: This environment is characterized by very low rainfall and extreme temperatures. It is the primary habitat for succulents as they thrive in these dry conditions.
- **Tundra**: This biome is cold and has a short growing season, with permafrost present. It is not suitable for succulents due to the cold and wet conditions.
- **Temperate Deciduous Forest**: This environment experiences four distinct seasons with adequate rainfall, making it unsuitable for succulents that require dry conditions.
- **Tropical Rainforest**: This biome is characterized by high humidity and heavy rainfall, which is not conducive for succulents that prefer dry conditions.

4. **Conclusion**:
- Based on the analysis, succulents are primarily found in the desert. The other environments listed (tundra, temperate deciduous forest, and tropical rainforest) do not provide the dry conditions necessary for succulents to thrive.

5. **Final Answer**:
- Therefore, the correct answer is that succulents occur in **deserts**.