what is true about a monocot leaf

Options

A. They are not dorsiventral leaves and possess non-uniform distribution of stomata .
B. Absence of bulliform cells from epidermis
C. Mesophyll not differentiated into palisade and spongy tissues
D. The leaves do not have parallel venation

Answer

To determine what is true about a monocot leaf, we will analyze the characteristics of monocot leaves based on the options provided in the question.

### Step-by-Step Solution:

1. **Understanding Monocot Leaves**:
- Monocot leaves are typically narrow and elongated. They are characterized by specific anatomical features that differentiate them from dicot leaves.

2. **Evaluating the Options**:
- **Option 1**: "They are not dorsi-ventral leaves and possess non-uniform distribution of stomata."
- This option is incorrect. Monocot leaves are indeed dorsi-ventral (having distinct upper and lower surfaces) and generally have a uniform distribution of stomata.

- **Option 2**: "The absence of buliform cells from epidermis."
- This option is also incorrect. Monocot leaves do have buliform cells, which are present on the upper surface and help in the regulation of leaf folding and unfolding.

- **Option 3**: "Mesophyll not differentiated into palisade and spongy tissues."
- This option is true. In monocots, the mesophyll is typically not differentiated into palisade and spongy tissues as seen in dicots. Instead, it is usually more uniform.

- **Option 4**: "The leaves do not have parallel venation."
- This option is incorrect. Monocot leaves are characterized by parallel venation, which is a hallmark feature of monocots.

3. **Conclusion**:
- After evaluating all the options, the only true statement about monocot leaves is that the "mesophyll is not differentiated into palisade and spongy tissues."

### Final Answer:
The true statement about a monocot leaf is that the mesophyll is not differentiated into palisade and spongy tissues.

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