Central cell of embryo sac contains

Options

A. A single haploid nucleus
B. Two haploid polar nucleus
C. One diploid fusion or secondary nucleus
D. Either B or C.

Answer

**Step-by-Step Solution:**

1. **Understanding the Structure of the Embryo Sac**: The embryo sac is a crucial part of the female gametophyte in flowering plants. It contains several cells, including synergids, an egg cell, antipodal cells, and a central cell.

2. **Identifying the Central Cell**: The central cell is located in the middle of the embryo sac and is the largest cell present. It plays a significant role in fertilization.

3. **Composition of the Central Cell**: The central cell contains two polar nuclei. Each of these nuclei is haploid (n), meaning they each have one set of chromosomes.

4. **Understanding the Nuclei Fusion**: During fertilization, the two haploid polar nuclei can fuse to form a diploid nucleus, known as the secondary nucleus. However, at the time of the question, we are focusing on what the central cell contains before any fusion occurs.

5. **Conclusion**: Therefore, the central cell of the embryo sac contains two haploid polar nuclei.

6. **Final Answer**: The correct answer is that the central cell of the embryo sac contains two polar nuclei.

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