A: Eight cells of octant stage in dicot embryogeny are made by 2 vertical and one tranverse divisions in embryonal cell
R: These cells are arranged in epibasal and hypobasal tier

Options

A. if both assetion A reason are ture and the reason is the correct explanation of the assertion then mark
B. if both assertion & reason are ture and the reason is not the correct explanation of the assertin then mark
C. if assertion is true statement but reason is false then mark
D. if both assertion and reason are flase statements then mark

Answer

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that in dicot embryogeny, the octant stage consists of eight cells formed through two vertical and one transverse division of the embryonal cell.
- In dicot embryos, the octant stage is a crucial phase where the zygote divides to form a specific arrangement of cells.

2. **Divisions Leading to Octant Stage**:
- The first division is a transverse division that results in two cells.
- Following this, two vertical divisions occur, leading to a total of eight cells.
- This division pattern is characteristic of the development in dicots.

3. **Understanding the Reason (R)**:
- The reason states that these eight cells are arranged in two tiers: the epibasal tier and the hypobasal tier.
- The epibasal tier consists of cells that will develop into the upper part of the embryo, while the hypobasal tier consists of cells that will develop into the lower part.

4. **Conclusion on Assertion and Reason**:
- Both the assertion and the reason are correct.
- However, the reason does not directly explain the assertion, as it describes the arrangement of cells rather than the process of division that leads to the octant stage.

5. **Final Answer**:
- The correct conclusion is that both the assertion and reason are correct, but the reason is not the correct explanation for the assertion.