In angiosperms, polar nuclei fuse to produce

Options

A. Diploid secondary nucleus
B. Zygote
C. Antipodal cells
D. Synergids

Answer

To answer the question "In angiosperms, polar nuclei fuse to produce," we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Angiosperms**:
- Angiosperms are flowering plants that reproduce through seeds enclosed within a fruit. They have a complex reproductive structure.

2. **Identifying the Female Gametophyte**:
- In angiosperms, the female gametophyte is known as the embryo sac. This structure contains several important cells, including the egg cell, synergids, antipodal cells, and polar nuclei.

3. **Structure of the Embryo Sac**:
- The embryo sac typically contains:
- 1 egg cell
- 2 synergids (located at the micropilar end)
- 3 antipodal cells (located at the chalazal end)
- 2 polar nuclei (located in the central cell)

4. **Fusion of Polar Nuclei**:
- The polar nuclei are located in the central cell of the embryo sac. During fertilization, these two polar nuclei fuse together.

5. **Result of the Fusion**:
- The fusion of the two polar nuclei results in the formation of a diploid structure known as the **diploid secondary nucleus**.

6. **Further Development**:
- After this fusion, the pollen tube delivers two male gametes. One male gamete fuses with the egg cell to form a zygote, while the other male gamete fuses with the diploid secondary nucleus to form the triploid endosperm.

### Final Answer:
In angiosperms, polar nuclei fuse to produce a **diploid secondary nucleus**.

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