Which of these is an incorrect contrast between monocots and dicots ?

Options

A. Vascular bundles in a ring-vascular bundles scattered
B. One cotyledon-two cotyledons
C. Leaf veins parallel-net veined
D. All of the above are incorrect

Explanation

To determine the incorrect contrast between monocots and dicots, we will analyze the provided options based on the characteristics of these two groups of flowering plants.

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Monocots**: These are flowering plants that have one cotyledon in their seeds.
- **Dicots**: These are flowering plants that have two cotyledons in their seeds.

2. **Identify Key Differences**:
- **Vascular Bundles**:
- In monocots, vascular bundles are scattered throughout the stem.
- In dicots, vascular bundles are arranged in a ring formation.
- **Cotyledons**:
- Monocots have one cotyledon.
- Dicots have two cotyledons.
- **Leaf Venation**:
- Monocots exhibit parallel venation in their leaves.
- Dicots exhibit reticulate (net-like) venation in their leaves.

3. **Evaluate Each Option**:
- **Option 1**: Vascular bundles in a ring (this is characteristic of dicots, not monocots).
- **Option 2**: One cotyledon (monocots) and two cotyledons (dicots) - this is a correct statement.
- **Option 3**: Leaf veins parallel (monocots) and net vein (dicots) - this is also a correct statement.
- **Option 4**: All of the above are incorrect - this is incorrect because some statements are correct.

4. **Conclusion**:
- The incorrect contrast is found in **Option 1**, which states that vascular bundles are in a ring, which is true for dicots, not monocots.

### Final Answer:
The incorrect contrast between monocots and dicots is **Option 1: Vascular bundles in a ring**.

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