Which of the following plants has the floral characters like zygomorphic flower, vexillary aestivation, diadelphous androecium and marginal placentation.

Options

A. Pisum
B. Belladonna
C. Brinjal
D. Asparagus

Answer

To answer the question regarding which plant exhibits the floral characters of zygomorphic flower, vexillary aestivation, diadelphous androecium, and marginal placentation, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Zygomorphic Flower:**
- A zygomorphic flower is one that can be divided into two equal halves only in one vertical plane. This means that if you cut the flower in a specific direction, you will get two symmetrical halves, but cutting in any other direction will not yield symmetrical halves.

**Hint:** Look for flowers that are symmetrical in only one direction.

2. **Identify Vexillary Aestivation:**
- Vexillary aestivation, also known as descending imbricate aestivation, occurs when the petals are arranged such that the largest petal (anterior petal) is innermost, while the smallest petals are on the outside. This specific arrangement is characteristic of certain plant families.

**Hint:** Remember that the largest petal is always innermost in vexillary aestivation.

3. **Recognize Diadelphous Androecium:**
- In a diadelphous androecium, the filaments of the stamens are united into two bundles, while the anthers remain free. This is an important feature to identify in the flower's structure.

**Hint:** Focus on the arrangement of the filaments and anthers; they should be in two distinct bundles.

4. **Understand Marginal Placentation:**
- Marginal placentation occurs when the placenta forms a ridge along the ventral suture of the ovary, and the ovules are attached along this ridge. This is a key characteristic in identifying certain types of flowers.

**Hint:** Look for the ovules being arranged along the edge or ridge of the ovary.

5. **Identify the Correct Plant:**
- The plant that exhibits all these characteristics (zygomorphic flower, vexillary aestivation, diadelphous androecium, and marginal placentation) is **Pisum** (commonly known as pea). Other options like brinjal, belladonna, or asparagus do not exhibit all these floral traits.

**Hint:** Cross-reference the characteristics with the options provided to find the one that matches all criteria.

### Final Answer:
The correct answer is **Pisum**.