The ploidy of endosperm in angiosperms is

Options

A. n
B. 2n
C. 3n
D. 4n

Answer

To determine the ploidy of endosperm in angiosperms, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Ploidy**: Ploidy refers to the number of sets of chromosomes in a cell. For example, diploid (2n) means two sets of chromosomes, triploid (3n) means three sets, and so on.

2. **Double Fertilization Process**: In angiosperms, the process of fertilization involves a unique mechanism known as double fertilization. This occurs when one sperm cell fertilizes the egg cell, forming a diploid zygote, while another sperm cell fuses with two polar nuclei in the embryo sac.

3. **Formation of Primary Endosperm Nucleus**: The fusion of the second sperm cell with the two polar nuclei results in the formation of a primary endosperm nucleus (PEN), which is diploid (2n).

4. **Development of Endosperm**: The primary endosperm nucleus then undergoes mitotic divisions without cytokinesis, leading to the formation of a triploid (3n) endosperm tissue. This triploid endosperm provides nourishment to the developing embryo.

5. **Conclusion**: Therefore, the ploidy of endosperm in angiosperms is triploid (3n).

### Final Answer:
The ploidy of endosperm in angiosperms is **3n**.

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