Cotyledons constitute the first pairs of leaves in

Options

A. Castor
B. Maize
C. Pea
D. Gram

Answer

To solve the question "Cotyledons constitute the first pairs of leaves in", we will analyze the options provided and understand the role of cotyledons in different plants.

### Step-by-Step Solution:

1. **Understanding Cotyledons**: Cotyledons are the first leaves that appear on a seedling. They are part of the embryo within the seed and play a crucial role in the early stages of a plant's development by providing nutrients.

2. **Identifying the Options**: The options given are:
- Castor
- Maize
- Pea
- Gram

3. **Analyzing Each Option**:
- **Castor**: In castor beans, the cotyledons are large and fleshy, and they serve as the first leaves of the plant.
- **Maize (Corn)**: In maize, the cotyledons are not the first leaves; instead, the first true leaves emerge after the cotyledons.
- **Pea**: In pea plants, the cotyledons are also the first leaves, but they are not as prominent as in castor.
- **Gram (Chickpea)**: Similar to peas, gram also has cotyledons that serve as the first leaves, but they are not the most prominent.

4. **Conclusion**: While both castor and pea have cotyledons that serve as the first leaves, castor is known for having larger and more prominent cotyledons that are more recognizable as the first leaves. Therefore, the correct answer to the question is **Castor**.

### Final Answer:
Cotyledons constitute the first pairs of leaves in **Castor**.