Which is the most common type of endosperm in angiospermic families?

Answer

### Step-by-Step Solution:

1. **Understanding Endosperm**:
- Endosperm is a tissue that provides nutrition to the developing embryo in seed plants. It is crucial for the growth and development of the embryo after fertilization.

2. **Types of Endosperm**:
- There are three main types of endosperm found in angiosperms:
- **Nuclear Endosperm**: Characterized by free nuclei without cell walls initially.
- **Cellular Endosperm**: Contains cell walls and is divided into cells by septa.
- **Helobial Endosperm**: A combination of the nuclear and cellular types, where one part develops as nuclear and the other as cellular.

3. **Identifying the Most Common Type**:
- Among these types, nuclear endosperm is the most prevalent in angiospermic families. This is because it allows for the free growth of nuclei, which can lead to a more efficient nutrient storage and distribution for the embryo.

4. **Conclusion**:
- Therefore, the most common type of endosperm found in angiospermic families is **nuclear endosperm**.