Which of the following characters is not associated in a plant having a single cotyledon in a seed, tendrillar stipules and adventitious root system

Options

A. Besexual flowers with homochlamydeous perianth
B. Reticulate venation in leaves
C. Trimerous flowers with odd tepal of outer whorl is anterior in position
D. Unisexual flowers in umbel inflorescence.

Answer

To solve the question regarding the characters associated with a plant having a single cotyledon in a seed, tendrillar stipules, and an adventitious root system, we need to analyze the characteristics of monocots (plants with a single cotyledon) and compare them with the options provided.

### Step-by-Step Solution:

1. **Identify the Characteristics of Monocots:**
- Monocots have an embryo with a single cotyledon.
- They typically have flower parts in multiples of three (trimerous).
- The leaf venation is parallel.
- The root system is adventitious.

2. **Analyze Each Option:**
- **Option 1: Bisexual flower with homochlamydonous perianth.**
- Monocots can have bisexual flowers, and homochlamydonous means having petals that are similar in shape and size. This option is possible for monocots.

- **Option 2: Reticulate venation in leaves.**
- This characteristic is associated with dicots, not monocots. Monocots have parallel venation, so this option does not fit with the characteristics of a monocot.

- **Option 3: Trimerous flower and odd temple.**
- This is consistent with monocots, as they have flower parts in multiples of three (trimerous).

- **Option 4: Unisexual flower and umbel inflorescence.**
- Monocots can also have unisexual flowers, and umbel inflorescence is a type of flower arrangement that can occur in monocots.

3. **Conclusion:**
- The character that is **not associated** with a plant having a single cotyledon, tendrillar stipules, and an adventitious root system is **Option 2: Reticulate venation in leaves.** This characteristic is associated with dicots.

### Final Answer:
**The correct option is Option 2: Reticulate venation in leaves.**

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