Name the component cells of the 'egg-apparatus' in an embryo sac.

Explanation

### Step-by-Step Solution:

1. **Understanding the Embryo Sac**: The embryo sac is a crucial structure in the ovule of flowering plants, where fertilization takes place. It contains several types of cells that play specific roles in reproduction.

2. **Identifying the Egg Apparatus**: Within the embryo sac, there is a specific group of cells known as the 'egg apparatus'. This is important for the fertilization process.

3. **Counting the Cells**: The egg apparatus is made up of a total of three cells.

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