Primary root is

Options

A. Positively geotropic
B. Positively hydrotropic
C. Both A and B
D. None of the above.

Answer

### Step-by-Step Solution:

1. **Understand the Primary Root**: The primary root, also known as the radical, is the first root that emerges when a seed germinates. It is crucial for anchoring the plant and absorbing water and nutrients from the soil.

2. **Define Geotropism**: Geotropism refers to the growth of a plant in response to gravity. A positively geotropic response means that the plant part grows towards the gravitational pull, which for roots is downward.

3. **Analyze the Primary Root's Growth Direction**: Since the primary root grows downward into the soil, it is exhibiting a positively geotropic behavior. This means it is growing in the direction of gravity.

4. **Define Hydrotropism**: Hydrotropism is the growth of a plant in response to moisture. A positively hydrotropic response indicates that the plant part grows towards areas with higher moisture content.

5. **Evaluate the Primary Root's Response to Moisture**: The primary root also grows towards moisture in the soil, indicating that it is positively hydrotropic. Roots will seek out water sources to ensure the plant has adequate hydration.

6. **Conclude the Answer**: Since the primary root is both positively geotropic (growing towards gravity) and positively hydrotropic (growing towards moisture), the correct answer is that the primary root is both A and B.

### Final Answer:
The primary root is both positively geotropic and positively hydrotropic (Option C).

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