The colour based contrasting traits in seven contrasting pairs, studied by Mendel in pea plant were

Options

A. 1
B. 2
C. 3
D. 4

Answer

To solve the question regarding the color-based contrasting traits studied by Mendel in pea plants, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Seven Contrasting Traits Studied by Mendel**:
Mendel studied seven contrasting traits in pea plants. These traits are:
- Seed shape
- Seed color
- Pod shape
- Pod color
- Flower color
- Plant height
- Flower position

2. **Classify Each Trait as Color-Based or Not**:
We need to determine which of these traits are color-based. The traits can be classified as follows:
- **Seed Shape**: Not color-based (Round vs. Wrinkled)
- **Seed Color**: Color-based (Yellow vs. Green)
- **Pod Shape**: Not color-based (Constricted vs. Inflated)
- **Pod Color**: Color-based (Green vs. Yellow)
- **Flower Color**: Color-based (Violet vs. White)
- **Plant Height**: Not color-based (Tall vs. Dwarf)
- **Flower Position**: Not color-based (Axial vs. Terminal)

3. **List the Color-Based Traits**:
From the classification, the color-based traits identified are:
- Seed Color
- Pod Color
- Flower Color

4. **Count the Color-Based Traits**:
We have found three color-based traits: Seed Color, Pod Color, and Flower Color.

5. **Conclusion**:
Therefore, the answer to the question is that there are three color-based contrasting traits studied by Mendel in pea plants.

### Final Answer:
The color-based contrasting traits in seven contrasting pairs studied by Mendel in pea plants are:
1. Seed Color (Yellow vs. Green)
2. Pod Color (Green vs. Yellow)
3. Flower Color (Violet vs. White)