Which of the following seed characters of Pisum sativum were studied by Mendel in his hybrization experiments ?
1. Seed shape
2. Seed weight
3. Seed coat colour
4. Seed starch grain size
5. Seed number

Options

A. 1 and 3
B. 1,2 and 3
C. 2,4 and 5
D. 1,3 and 4

Answer

To solve the question regarding which seed characters of Pisum sativum were studied by Mendel in his hybridization experiments, we need to analyze the traits that Mendel specifically focused on during his research.

### Step-by-Step Solution:

1. **Identify the Plant and Traits Studied**: Mendel conducted his experiments using the pea plant, scientifically known as Pisum sativum. He studied various traits associated with this plant.

2. **List the Traits Studied by Mendel**: Mendel focused on seven specific traits in his experiments:
- Flower color
- Flower position
- Stem length
- Seed shape
- Seed color
- Pod shape
- Pod color

3. **Analyze the Options Given in the Question**:
- **Seed Shape**: This trait was indeed studied by Mendel.
- **Seed Weight**: This trait was not one of the seven traits Mendel studied.
- **Seed Coat Color**: This trait was also not included in Mendel's studies.
- **Seed Starch Grain Size**: This trait was not studied by Mendel.
- **Seed Number**: This trait was not among the traits Mendel focused on.

4. **Conclusion**: From the analysis, the only seed characters studied by Mendel are:
- Seed shape (1)
- Seed color (not listed in the options but relevant)
- Seed coat color (3) was not studied.

Thus, the correct answer to the question is **Seed Shape** (1) and **Seed Coat Color** (3) was not included in Mendel's studies.

### Final Answer:
The seed characters of Pisum sativum studied by Mendel in his hybridization experiments are:
- **1. Seed Shape**
- **3. Seed Coat Color** (not studied)