Which one of the following structure found in dicot seed will be genetically identical with its maternal plant ?

Options

A. Testa
B. Radicle
C. Plumule
D. Cotyledon

Answer

To solve the question "Which one of the following structures found in dicot seed will be genetically identical with its maternal plant?", we can follow these steps:

### Step 1: Understand the Question
The question is asking for a structure in a dicot seed that is genetically identical to the maternal plant. This means we need to identify which part of the seed is derived solely from the maternal plant without any contribution from the paternal plant.

### Step 2: Analyze the Options
We have four options to consider:
- A) Testa
- B) Radicle
- C) Plumule
- D) Cotyledon

### Step 3: Evaluate Each Option
1. **Cotyledon (Option D)**: The cotyledon is formed from the endosperm, which is produced by the fusion of a male gamete with the central cell. Therefore, it is not genetically identical to the maternal plant as it involves paternal genetic material.

2. **Radicle (Option B)**: The radicle is part of the embryo that develops from the zygote, which is formed by the fusion of a male gamete with the egg cell (maternal). Thus, the radicle contains genetic material from both the maternal and paternal plants.

3. **Plumule (Option C)**: Similar to the radicle, the plumule also develops from the zygote. It is formed through the fusion of the male gamete with the egg cell, meaning it also contains genetic material from both parents.

4. **Testa (Option A)**: The testa is the outermost layer of the seed coat and is derived from the integuments of the ovule. The integuments are maternal tissues, and thus the testa is genetically identical to the maternal plant.

### Step 4: Conclusion
Based on the analysis, the correct answer is **Option A: Testa**. The testa is the only structure in the dicot seed that is genetically identical to the maternal plant.