An offset is a lateral branch with short internodes and each node bearing a rosette of leaves and a tuft of roots. It is found in:

Options

A. Pistia
B. Euphorbia
C. Chrysanthemum
D. Zostera

Answer

To solve the question regarding where an offset is found, we can follow these steps:

### Step 1: Understand the Definition of an Offset
An offset is described as a lateral branch with short internodes, where each node bears a rosette of leaves and a tuft of roots. This indicates that offsets are a type of stem modification.

**Hint:** Remember that offsets are specifically related to the structure and function of certain plants.

### Step 2: Identify the Function of Offsets
Offsets are primarily involved in vegetative reproduction. This means they allow plants to reproduce asexually, creating new plants from the parent plant.

**Hint:** Think about how different plants reproduce and the structures they use for this purpose.

### Step 3: Consider the Types of Plants that Produce Offsets
Offsets are commonly found in aquatic plants. The examples given in the transcript are Pistia and Eichhornia, both of which are known for their offsets.

**Hint:** Recall the characteristics of aquatic plants and how they adapt to their environments.

### Step 4: Analyze the Other Options
- **Euphorbia:** This plant has a fleshy cylindrical stem that performs photosynthesis, but it does not produce offsets.
- **Chrysanthemum:** This plant has a modification known as a sucker, not an offset.
- **Zostera:** This is a type of marine grass that has a runner modification, not an offset.

**Hint:** Compare the characteristics of each option with the definition of an offset.

### Step 5: Conclude the Correct Answer
Based on the above analysis, the correct answer is that offsets are found in **Pistia**.

**Final Answer:** The correct option is **Pistia**.