The origin of root hairs and lateral roots is , respectively ,

Options

A. Exogenous and endogenous
B. Endogenous and exogenous
C. Both endogenously
D. Both exogenously

Answer

To answer the question regarding the origin of root hairs and lateral roots, we can break down the solution into clear steps:

### Step-by-Step Solution:

1. **Identify the Origin of Root Hairs**:
- Root hairs are extensions of root epidermal cells. They arise from the outer layer of the root, specifically from the epidermis.
- Therefore, the origin of root hairs is classified as **exogenous**. This means they originate from the external layer of the root.

2. **Identify the Origin of Lateral Roots**:
- Lateral roots, also known as secondary roots, do not arise from the epidermis but instead originate from the pericycle, which is a layer of cells located inside the endodermis of the root.
- Hence, the origin of lateral roots is classified as **endogenous**. This indicates that they develop from internal tissues of the root.

3. **Summarize the Findings**:
- Based on the above information, we can conclude that:
- The origin of root hairs is **exogenous**.
- The origin of lateral roots is **endogenous**.

4. **Final Answer**:
- Therefore, the correct answer to the question is:
- The origin of root hairs is exogenous, and the origin of lateral roots is endogenous.