Primary root is :
1. Positively geotropic 2. Positively hydrotropic 3. Negatively geotropic 4. Negatively hydrotropic Code:

Options

A. 1, 2 and 3 are correct
B. 1 and 2 are correct
C. 2 and 4 are correct
D. 1 and 3 are correct

Answer

To determine the correct answer to the question regarding the nature of the primary root, we can analyze the options provided based on the characteristics of root growth.

### Step-by-Step Solution:

1. **Understanding Root Growth**:
- Roots grow downwards into the soil, which is opposite to the direction of stem growth that goes upwards.

2. **Geotropism**:
- **Positive Geotropism**: This refers to growth in the direction of gravitational pull. Since roots grow downwards towards the gravitational force, they exhibit positive geotropism.
- **Negative Geotropism**: This refers to growth away from the gravitational pull, which is characteristic of stems.

3. **Hydrotropism**:
- **Positive Hydrotropism**: This indicates growth towards areas of higher water concentration. Roots typically grow towards moisture found in the soil, showing positive hydrotropism.
- **Negative Hydrotropism**: This indicates growth away from water concentration, which is again characteristic of stems.

4. **Analyzing the Options**:
- **Option 1: Positively Geotropic** - Correct, as roots grow towards gravity.
- **Option 2: Positively Hydrotropic** - Correct, as roots grow towards moisture.
- **Option 3: Negatively Geotropic** - Incorrect, as this describes stem behavior.
- **Option 4: Negatively Hydrotropic** - Incorrect, as this also describes stem behavior.

5. **Conclusion**:
- The primary root is both positively geotropic and positively hydrotropic. Therefore, the correct answer is **1 and 2**.

### Final Answer:
The primary root is: **1. Positively geotropic and 2. Positively hydrotropic**.