How many haploid cells are present in matue female gametophyte of a flowering plant? Name them.

Explanation

To solve the question, we will break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Mature Female Gametophyte**:
- The mature female gametophyte in flowering plants is also known as the embryo sac. It is formed after the process of megasporogenesis and megagametogenesis.

2. **Determining the Number of Haploid Cells**:
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