In which of the following plants grafting is not possible ?

Options

A. Plum
B. Pear
C. Mango
D. Maize

Answer

To determine in which of the following plants grafting is not possible, we need to understand the concept of grafting and the types of plants involved.

### Step-by-Step Solution:

1. **Understand Grafting**: Grafting is an artificial asexual reproduction method where two different plants are joined together to grow as one. This process requires the presence of vascular cambium, which is a layer of tissue responsible for the growth of new vascular tissue.

2. **Identify Vascular Cambium**: Vascular cambium is found in dicot plants, which allows them to undergo grafting. In contrast, monocot plants lack this vascular cambium, making grafting impossible in them.

3. **Analyze the Options**:
- **Option A: Plum** - Plum is a dicot plant, which means it has vascular cambium and can undergo grafting.
- **Option B: Pear** - Pear is also a dicot plant, so it can also be grafted.
- **Option C: Mango** - Mango is another dicot plant, allowing for grafting as well.
- **Option D: Maize** - Maize is a monocot plant, which does not have vascular cambium and therefore cannot undergo grafting.

4. **Conclusion**: Since grafting is not possible in maize due to its monocot nature and absence of vascular cambium, the correct answer is **Option D: Maize**.