Offset is a type of stem present in

Options

A. Pistia
B. Colocasia
C. Oxalis
D. Potato

Answer

### Step-by-Step Solution:

1. **Understanding Offsets**:
- An offset is a type of stem modification. It is a lateral branch that grows horizontally from the main stem.
- Offsets have short internodes, which means the spaces between the nodes (where leaves and roots emerge) are very small.

2. **Characteristics of Offsets**:
- Each node on an offset bears a cluster of leaves, often referred to as a rosette of leaves.
- There is also a tuft of roots that emerges from each node, which helps in anchoring the plant.

3. **Habitat of Offsets**:
- Offsets are typically found in aquatic plants. This adaptation allows these plants to spread and thrive in water environments.

4. **Examples of Plants with Offsets**:
- One well-known example of a plant that produces offsets is **Pistia** (commonly known as water lettuce).
- Another example, although not mentioned in the options, is **Eichhornia** (commonly known as water hyacinth), which also produces offsets.

5. **Function of Offsets**:
- The primary function of offsets is vegetative propagation. This means they help the plant reproduce by spreading to new areas or niches, allowing the species to expand and thrive in suitable environments.

6. **Conclusion**:
- Based on the characteristics and examples discussed, the answer to the question is that offsets are a type of stem present in **Pistia**.