Which is not true about monocots

Options

A. Embryo has single cotyledon
B. Leaves show parallel venation
C. Flowers are generally trimerous
D. Vascular bundles are conjoint, collateral and open.

Answer

To determine which statement is not true about monocots, we need to analyze the characteristics of monocotyledons (monocots) in detail. Here’s a step-by-step solution:

### Step 1: Understand the Definition of Monocots
Monocots are a class of flowering plants (angiosperms) that are characterized by having a single cotyledon in their seeds.

### Step 2: Identify Key Characteristics of Monocots
1. **Cotyledon**: Monocots have one cotyledon in their embryos.
2. **Leaf Venation**: The leaves of monocots typically exhibit parallel venation.
3. **Flower Structure**: Flowers of monocots are generally trimerous, meaning they have parts in multiples of three.
4. **Root System**: Monocots usually have fibrous root systems, which are adventitious.
5. **Vascular Bundles**: The vascular bundles in monocots are numerous and scattered throughout the ground tissue, and they are not conjoined, collateral, and open.

### Step 3: Analyze Each Statement
- **Statement 1**: "Embryo has single cotyledon" - This is true.
- **Statement 2**: "Leaves show parallel venation" - This is true.
- **Statement 3**: "Flowers are generally trimerous" - This is true.
- **Statement 4**: "Vascular bundles are conjoined, collateral, and open" - This is NOT true for monocots.

### Conclusion
The statement that is not true about monocots is: **"Vascular bundles are conjoined, collateral, and open."**

### Final Answer
Thus, the correct answer is that the statement regarding vascular bundles is not true about monocots.

---