Select incorret pair

Options

A. Stem of sunflower- Exarch xylem
B. Stem of maize -Endarch xylem
C. Root of gram -Exarch xylem
D. Root of jowar -Exarch xylem

Answer

To solve the question of selecting the incorrect pair regarding the xylem conditions in various plant parts, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Terms:**
- **Exarch Xylem:** In this condition, the protoxylem is located towards the periphery of the plant organ, while the metaxylem is situated towards the center. This condition is typically found in roots.
- **Endarch Xylem:** In this condition, the protoxylem is located towards the center, and the metaxylem is towards the periphery. This condition is commonly found in stems.

2. **Analyze Each Pair:**
- **Option 1:** Stem of sunflower, exarch xylem.
- **Analysis:** Stems typically exhibit endarch xylem. Therefore, this pair is incorrectly matched.

- **Option 2:** Stem of maize, endarch xylem.
- **Analysis:** This is correct as maize stems exhibit endarch xylem.

- **Option 3:** Root of gram, exarch xylem.
- **Analysis:** This is correct since roots, including that of gram, typically have exarch xylem.

- **Option 4:** Root of zoa, exarch xylem.
- **Analysis:** This is also correct as roots generally exhibit exarch xylem.

3. **Identify the Incorrect Pair:**
- After analyzing all options, it is clear that the first option (stem of sunflower, exarch xylem) is the incorrect pair.

### Final Answer:
The incorrect pair is **Option 1: Stem of sunflower, exarch xylem.**