Four plants (A, B, C, D) are observed. ‘A’ shows axile placentation of unitegmic ovules within the ovary. 'B' shows basal placentation of unitegmic ovule within the ovary. 'C' has legume fruit with cotyledons as chief edible parts. 'D' has pneumatophores and vivipary type of seed germination. A, B, C and D plants, respectively are

Options

A. Thorn apple, Sunflower, Pea, Rhizophora
B. Custard apple, Helianthus, Pisum, Rhizophora
C. Thorn apple, Sunflower, Dolichos, Sugarcane
D. Datura, Sunflower, Coconut, Rhizophora

Answer

To solve the question regarding the identification of the four plants (A, B, C, D) based on their characteristics, we will analyze each plant step by step.

### Step-by-Step Solution:

1. **Identify Plant A**:
- **Characteristic**: A shows axile placentation of unitegmic ovules within the ovary.
- **Explanation**: Axile placentation means that the ovules are attached to the central axis of a multilocular ovary. Examples include tomato, citrus, thorn apple, and china rose.
- **Conclusion**: The correct identification for Plant A is **Thorn Apple** (Datura), which exhibits axile placentation.

2. **Identify Plant B**:
- **Characteristic**: B shows basal placentation of unitegmic ovule within the ovary.
- **Explanation**: Basal placentation means that the ovule is attached at the base of a unilocular ovary. Common examples are marigold and sunflower.
- **Conclusion**: The correct identification for Plant B is **Sunflower** (Helianthus), which shows basal placentation.

3. **Identify Plant C**:
- **Characteristic**: C has a legume fruit with cotyledons as the chief edible parts.
- **Explanation**: Legumes are known for having fruits that are pods, and the edible part is typically the cotyledons. Common examples include pea and dolichos.
- **Conclusion**: The correct identification for Plant C is **Pea** (Pisum sativum), which has edible cotyledons.

4. **Identify Plant D**:
- **Characteristic**: D has pneumatophores and vivipary type of seed germination.
- **Explanation**: Pneumatophores are specialized aerial roots that help in gas exchange, typically found in plants like Rhizophora (mangroves). Vivipary refers to seeds germinating while still attached to the parent plant.
- **Conclusion**: The correct identification for Plant D is **Rhizophora**, which exhibits these characteristics.

### Final Identification:
- Plant A: Thorn Apple (Datura)
- Plant B: Sunflower (Helianthus)
- Plant C: Pea (Pisum sativum)
- Plant D: Rhizophora

Thus, the answer is **Option A: Thorn Apple, Sunflower, Pea, and Rhizophora**.