Free nuclear divisions are characteristic of

Options

A. Cellular endosperm
B. Nuclear endosperm
C. Helobial endosperm
D. Both B and C.

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the characteristic of free nuclear divisions in relation to endosperm types.

2. **Identifying Endosperm Types**: In angiosperms, there are different types of endosperm: nuclear endosperm, cellular endosperm, and halobial endosperm.

3. **Defining Free Nuclear Division**: Free nuclear division refers to the process where the nucleus divides (karyokinesis) without the cytoplasm dividing (cytokinesis). This results in multiple nuclei within a common cytoplasm.

4. **Linking Free Nuclear Division to Endosperm**: The primary endosperm cell, which is triploid due to double fertilization, can undergo free nuclear divisions. This means that the endosperm can develop without the formation of cell walls initially, leading to a nuclear endosperm.

5. **Contrasting with Cellular Endosperm**: In contrast, cellular endosperm involves both karyokinesis and cytokinesis, resulting in distinct cells forming the endosperm tissue.

6. **Conclusion**: Based on the definitions and processes discussed, free nuclear divisions are characteristic of nuclear endosperm.

7. **Final Answer**: The correct answer is **nuclear endosperm**.