Growth of angiospermic embryo is

Options

A. Endoscopic
B. Exoscopic
C. Endosporic
D. Exosporic.

Answer

**Step-by-Step Solution:**

1. **Understanding the Context**: The question asks about the growth of the angiospermic embryo, which is a crucial part of flowering plants' reproductive process.

2. **Starting Point - Nucellus Tissue**: The growth begins in the nucellus tissue of the ovule. This tissue contains cells that can differentiate into various types of reproductive cells.

3. **Formation of Megaspore Mother Cell**: One of the cells in the nucellus differentiates into a megaspore mother cell. This cell is diploid (2n) and is responsible for producing megaspores.

4. **Meiosis Process**: The megaspore mother cell undergoes meiosis, a type of cell division that reduces the chromosome number by half. This process results in the formation of four haploid megaspores.

5. **Degeneration of Megaspores**: Out of the four megaspores formed, three will degenerate, leaving only one functional megaspore.

6. **Monosporic Development**: The surviving megaspore undergoes monosporic development, which means it develops from a single megaspore.

7. **Mitosis in Megaspore**: The megaspore undergoes three successive mitotic divisions.
- First, it divides to form two nuclei (two-nucleate stage).
- Next, it divides again to form four nuclei (four-nucleate stage).
- Finally, it divides to form eight nuclei (eight-nucleate stage).

8. **Formation of Embryo Sac**: These nuclei will arrange themselves to form the embryo sac, which is the structure where fertilization occurs.

9. **Endosporic Development**: Since all the developmental processes are taking place inside the megaspore, this type of growth is classified as endosporic development.

10. **Conclusion**: Therefore, the growth of the angiospermic embryo is endosporic.

**Final Answer**: The growth of angiospermic embryo is endosporic.

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