In dicot embryo the radicle is formed by

Options

A. Epibasal tier of embryo
B. Hypobasal tier of embryo
C. Hypophysis of suspensor
D. Terminal cell of suspensor.

Answer

To determine the formation of the radicle in a dicot embryo, we need to analyze the options provided and understand the role of different parts of the embryo.

### Step-by-Step Solution:

1. **Understanding the Radicle**:
- The radicle is the part of the plant embryo that develops into the primary root.

2. **Identifying the Options**:
- We have four options to consider:
1. Epibasal tier of embryo
2. Hypobasal tier of embryo
3. Hypophysis of suspensor
4. Terminal cell of suspensor

3. **Evaluating Option 1 - Epibasal Tier of Embryo**:
- The epibasal tier is the upper tier of cells in the embryo. It gives rise to the cotyledons and the plumule, not the radicle.
- **Conclusion**: This option is incorrect.

4. **Evaluating Option 2 - Hypobasal Tier of Embryo**:
- The hypobasal tier is located near the suspensor and primarily develops into the hypocotyl.
- **Conclusion**: This option is also incorrect.

5. **Evaluating Option 3 - Hypophysis of Suspensor**:
- The hypophysis is the part of the suspensor that gives rise to the radicle during the development of the dicot embryo.
- **Conclusion**: This option is correct.

6. **Evaluating Option 4 - Terminal Cell of Suspensor**:
- The terminal cell of the suspensor becomes swollen and functions as a haustorium, which is involved in nutrient absorption from the host plant in parasitic plants.
- **Conclusion**: This option is incorrect.

7. **Final Answer**:
- The radicle in a dicot embryo is formed by the **hypophysis of the suspensor**.

### Summary:
The correct answer is **Option 3: Hypophysis of Suspensor**.