Embryo sac of angiosperms contains

Options

A. 3- celled egg apparatus, 3 antipodal cells and 2 polar nuclei
B. 2- called egg apparatus, 3 antipodal cells and 2 polar nuclei
C. 3- celled egg apparatus, 2 antipodal cells and 1 polar nucleus
D. 3- celled egg apparat us, 1 antipodal cell and 2 polar nuclei.

Answer

### Step-by-Step Text Solution:

1. **Understanding the Embryo Sac**: The embryo sac is a crucial structure in angiosperms (flowering plants) that develops within the ovule. It plays a vital role in reproduction, specifically in fertilization.

2. **Structure of the Embryo Sac**: The embryo sac typically contains several key components:
- **Egg Apparatus**: This consists of one egg cell and two synergids. The egg cell is the female gamete, while the synergids help in guiding the pollen tube for fertilization.
- **Antipodal Cells**: There are three antipodal cells located at the opposite end of the egg apparatus. Their exact function is not fully understood, but they are part of the embryo sac.
- **Polar Nuclei**: There are two polar nuclei located in the center of the embryo sac. These nuclei will eventually fuse with a sperm cell during fertilization to form the triploid endosperm.

3. **Formation of the Embryo Sac**: The embryo sac develops from the megaspore mother cell through a process called megasporogenesis. The megaspore mother cell undergoes meiosis to produce four haploid megaspores, of which three degenerate, leaving one functional megaspore that develops into the embryo sac.

4. **Identifying the Components**: Based on the description:
- The embryo sac contains **1 egg cell**, **2 synergids**, **3 antipodal cells**, and **2 polar nuclei**.

5. **Evaluating the Options**:
- The correct option must include:
- 3 antipodal cells
- 1 egg cell and 2 synergids (3 cells in total for the egg apparatus)
- 2 polar nuclei
- The first option correctly identifies these components.

6. **Conclusion**: The correct answer to the question "Embryo sac of angiosperms contains" is the first option, which includes the correct number of cells and nuclei present in the embryo sac.