In ________the leaf base expands into a sheath covering the stem partially or wholly.

Options

A. monocots
B. dicots
C. china rose
D. leguminous plants

Answer

To solve the question, "In ________ the leaf base expands into a sheath covering the stem partially or wholly," we need to identify the type of plants where this phenomenon occurs.

### Step-by-Step Solution:

1. **Understanding the Question**: The question is asking about a specific type of plant where the leaf base expands into a sheath that can cover the stem either partially or completely.

2. **Identifying Plant Types**: There are two main categories of flowering plants: monocotyledons (monocots) and dicotyledons (dicots). We need to determine which category exhibits the described characteristic.

3. **Characteristics of Monocots**: In monocots, such as grasses, the leaf base often expands and forms a sheath that encircles the stem. This is a common feature of monocot plants.

4. **Characteristics of Dicots**: In contrast, dicots do not typically have leaf bases that form such sheaths. Their leaf structure is different, and they usually have a more distinct petiole.

5. **Evaluating the Options**:
- **Option 1: Monocots** - This is the correct answer, as monocots exhibit the described sheath formation.
- **Option 2: Dicots** - Incorrect, as dicots do not have this characteristic.
- **Option 3: Chinarose** - This is a dicot plant, so it is also incorrect.
- **Option 4: Leguminous plants** - These are primarily dicots, thus incorrect as well.

6. **Conclusion**: Based on the characteristics of the plant types, the correct answer is that in monocots, the leaf base expands into a sheath covering the stem partially or wholly.

### Final Answer:
In **monocots**, the leaf base expands into a sheath covering the stem partially or wholly.