In sunflower stem, the pericycle is present in the from of patches and they are formed by

Options

A. Parenchmatous cell
B. Sclerenchymatous cells
C. Collenchymatous cells
D. Both (a) and (b)

Answer

To solve the question regarding the pericycle in the sunflower stem, we will follow these steps:

### Step 1: Understand the Structure of the Dicot Stem
The sunflower is classified as a dicot, which means its stem anatomy will have specific characteristics. The structure of a dicot stem includes various layers such as the epidermis, cortex, pericycle, vascular tissues, and pith.

**Hint:** Remember that dicots have a distinct stem structure that includes multiple layers.

### Step 2: Identify the Layers of the Stem
In the anatomy of the dicot stem, the outermost layer is the epidermis, followed by the cortex. The cortex consists of different layers, including the hypodermis and endodermis.

**Hint:** Focus on the order of layers from the outside to the inside of the stem.

### Step 3: Locate the Pericycle
The pericycle is located just inside the cortex. It is a layer of cells that can vary in structure depending on the type of plant. In the case of the sunflower, the pericycle is present in patches.

**Hint:** The pericycle is an important layer that can indicate the plant's type based on its structure.

### Step 4: Determine the Composition of the Pericycle
In the sunflower stem, the pericycle is composed of sclerenchyma cells. These cells are characterized by their thick walls and lack of intercellular spaces. Sclerenchyma cells can be dead at maturity and provide structural support.

**Hint:** Pay attention to the types of cells that make up the pericycle and their characteristics.

### Step 5: Conclude the Answer
Based on the information gathered, we can conclude that in the sunflower stem, the pericycle is formed by patches of sclerenchyma cells.

**Hint:** Summarize the findings to arrive at the final answer.

### Final Answer
The pericycle in the sunflower stem is present in the form of patches and is formed by sclerenchyma cells.