Monocot characteristics are

Options

A. Fibrous root system , parallel-veined leaves, trimerous flowers and two cotyledons
B. Fibrous root system ,parallel -veined leaves, trimerous flowers and one cotyldeon
C. Fibrous root system , reticulate veined leaves, trimerous flowers and one cotyledon
D. Tap root system, parallel venation, trimerous flowers and one cotyledon

Answer

### Step-by-Step Solution

1. **Definition of Monocots**: Monocots, or monocotyledons, are a group of flowering plants characterized by having one cotyledon in their seeds.

2. **Root System**: Monocots typically have a fibrous root system. This means that their roots are thin and spread out in a network, rather than having a single dominant root (like a taproot).

3. **Leaf Venation**: The leaves of monocots exhibit parallel venation. In this type of venation, the veins run parallel to each other along the length of the leaf.

4. **Flower Structure**: Monocots usually have trimerous flowers, which means that their flowers are typically organized in multiples of three (e.g., three petals).

5. **Cotyledons**: As mentioned earlier, monocots have one cotyledon in their seeds, which distinguishes them from dicots that have two cotyledons.

6. **Examples of Monocots**: Common examples of monocots include plants like rice, wheat, and maize.

7. **Comparison with Dicots**: In contrast, dicots (or dicotyledons) have two cotyledons, a taproot system, reticulate venation in leaves, and their flowers are typically tetramerous (four petals) or pentamerous (five petals).

### Final Answer
The characteristics of monocots include:
- Fibrous root system
- Parallel veined leaves
- Trimerous flowers
- One cotyledon