Name all the haploid cells present in an unfertilized mature embryo-sac of a flowering plant. Write the total number of cells in it.

Explanation

To answer the question regarding the haploid cells present in an unfertilized mature embryo-sac of a flowering plant, we can break down the information step by step.

### Step-by-Step Solution:

1. **Understanding the Embryo-Sac Structure**:
- The mature embryo-sac in flowering plants (angiosperms) is typically a seven-celled structure that develops within the ovule.

2. **Identifying the Cells**:
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