Root does not show

Options

A. Distinction of primary and secondary roots
B. Distinction of nodes and internodes
C. Tertiary roots and rootlets
D. Endogenous branches.

Answer

To solve the question "Root does not show," we need to analyze the options provided and determine which characteristic is not exhibited by roots. Let's break down the options step by step.

### Step-by-Step Solution:

1. **Understanding Root Structure**:
- Roots primarily consist of a main root (primary root) that grows downward into the soil. This primary root can give rise to secondary roots.

2. **Identifying Root Branching**:
- The primary root gives rise to secondary roots, which are further branched into tertiary roots. Tertiary roots can then produce even smaller branches known as rootlets.

3. **Evaluating the Options**:
- **Option 1: Distinction of primary and secondary roots**:
- This option is incorrect because roots do show a distinction between primary and secondary roots.

- **Option 2: Distinction of nodes and internodes**:
- This option is correct because roots do not have nodes and internodes like stems do. In stems, nodes are points where leaves attach, and internodes are the spaces between nodes. This distinction is not applicable to roots.

- **Option 3: Tertiary roots and rootlets**:
- This option is incorrect because tertiary roots do give rise to rootlets, indicating that there is a relationship between them.

- **Option 4: Endogenous branching**:
- This option is also incorrect because roots can exhibit endogenous branching, which refers to the formation of branches from within the root system.

4. **Conclusion**:
- The correct answer is **Option 2: Distinction of nodes and internodes**, as roots do not show this characteristic.