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 characteristic is observed.

### Step-by-Step Solution:

1. **Identify the Type of Plants**:
- The question is asking about a specific type of plant where the leaf base expands into a sheath. This characteristic is commonly found in monocots.

**Hint**: Think about the differences between monocots and dicots in terms of leaf structure.

2. **Understanding Leaf Structure in Monocots**:
- In monocots, the leaf base is known to expand and can wrap around the stem. This is a defining feature of many monocot plants.

**Hint**: Recall that monocots have parallel venation in their leaves.

3. **Examples of Monocots**:
- Common examples of monocots include plants like wheat and maize, which exhibit this sheath-like leaf base.

**Hint**: Consider common agricultural plants that are classified as monocots.

4. **Contrast with Dicots**:
- In contrast, dicots have a different leaf structure where the leaf base does not form a sheath around the stem. Instead, they have a petiole that connects the leaf blade to the stem.

**Hint**: Remember that dicots typically have reticulate venation.

5. **Conclusion**:
- Based on the characteristics discussed, the correct answer to the question is "Monocot."

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