Among the following characters, which one was not considered by Mendel in his experiments on pea?

Options

A. Stem - Tall or Dwarf
B. Trichomes - Glandular or Non-glandular
C. Seed - Green or Yellow
D. Pod - inflated or Constricted

Explanation

To determine which character was not considered by Mendel in his experiments on pea plants, we will analyze the given options based on Mendel's documented traits.

### Step-by-Step Solution:

1. **Identify the Characters Considered by Mendel**:
Mendel conducted experiments on pea plants and focused on seven specific contrasting traits. These traits included:
- Stem height (tall or dwarf)
- Flower color (violet or white)
- Flower position (axial or terminal)
- Pod shape (inflated or constricted)
- Pod color (green or yellow)
- Seed shape (round or wrinkled)
- Seed color (yellow or green)

2. **Analyze the Given Options**:
We have four options to evaluate:
- **Option 1**: Stem (tall or dwarf) - This was one of Mendel's traits.
- **Option 2**: Trichomes (glandular or non-glandular) - This character was not included in Mendel's experiments.
- **Option 3**: Seed (green or yellow) - This was also one of Mendel's traits.
- **Option 4**: Pod (inflated or constricted) - This was another trait studied by Mendel.

3. **Determine the Correct Answer**:
From the analysis, we can see that the only character not considered by Mendel is **trichomes (glandular or non-glandular)**.

### Conclusion:
The character that was not considered by Mendel in his experiments on pea plants is **trichomes**.

**Final Answer**: Option B: Trichomes

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