Which of the following is true for the dicot roots?

Options

A. Both vascular and cork cambium are responsible for the secondary growth
B. Vascular cambium arises during the primary growth
C. They do not show secondary growth just like monocot roots
D. Cork cambium develops during the primary growth

Answer

To determine which statement is true for dicot roots, we need to analyze the characteristics of dicot roots and their growth patterns. Here’s a step-by-step breakdown:

### Step 1: Understand the Structure of Dicot Roots
Dicot roots typically have a distinct structure that includes a central vascular cylinder. This structure is organized with xylem and phloem arranged in a specific pattern.

**Hint:** Look for the arrangement of vascular tissues in dicot roots.

### Step 2: Identify the Role of Cambium
Cambium is a type of meristematic tissue responsible for secondary growth. In dicots, the vascular cambium and cork cambium play significant roles in this process. Vascular cambium is responsible for the formation of secondary xylem (wood) and secondary phloem.

**Hint:** Remember that cambium is crucial for secondary growth in plants.

### Step 3: Evaluate the Statements
1. **Both vascular and cork cambium are responsible for secondary growth.** - This statement is true because both types of cambium contribute to the increase in girth of the root.

2. **Vascular cambium arises during primary growth.** - This statement is false. Vascular cambium develops during secondary growth.

3. **Dicot roots do not show secondary growth like monocot roots.** - This statement is false. Dicot roots do exhibit secondary growth, while monocot roots typically do not.

4. **Cork cambium develops during primary growth.** - This statement is also false. Cork cambium arises during secondary growth.

**Hint:** Compare the statements against what you know about cambium and growth in dicots versus monocots.

### Step 4: Conclusion
After evaluating the statements, the only true statement regarding dicot roots is that both vascular and cork cambium are responsible for secondary growth.

**Final Answer:** The correct statement is: **Both vascular and cork cambium are responsible for secondary growth.**