undifferentiated ground tissue is present in stem of

Options

A. sunflower
B. pisum
C. maize
D. cucurbita

Answer

### Step-by-Step Solution:

1. **Understanding Ground Tissue**: Ground tissue in plants is responsible for storage, photosynthesis, and support. It can be classified into differentiated and undifferentiated types.

2. **Analyzing the Options**: The question provides four options: sunflower, pea (Pisum), maize, and crooked beta. We need to determine which of these has undifferentiated ground tissue in its stem.

3. **Evaluating Sunflower**:
- In the sunflower, the ground tissue is differentiated into several structures: hypodermis, general cortex, endodermis, pericycle, medulla, and medullary rays.
- Since it is differentiated, this option is incorrect.

4. **Evaluating Pea (Pisum)**:
- Similar to the sunflower, the ground tissue in pea is also differentiated into hypodermis, general cortex, endodermis, pericycle, medulla, and medullary rays.
- Therefore, this option is also incorrect.

5. **Evaluating Maize**:
- In maize, the ground tissue is noted to be undifferentiated. This means that the ground tissue does not have specialized structures and remains in a more primitive state.
- This option is correct.

6. **Evaluating Crooked Beta**:
- In crooked beta, the ground tissue is again differentiated into hypodermis, general cortex, endodermis, and other structures similar to sunflower and pea.
- Thus, this option is incorrect.

7. **Final Conclusion**: After evaluating all options, the only plant with undifferentiated ground tissue in its stem is maize.

### Final Answer:
Undifferentiated ground tissue is present in the stem of maize.

---