When the primary sexual organ does not develop, puberty may appear due to :

Options

A. Stimulation of adrenal cortex
B. Stimulation of adrenal medulla
C. Excessive secretion from gonads
D. None of the above

Answer

To solve the question "When the primary sexual organ does not develop, puberty may appear due to:", we will analyze the options provided and determine which one is correct based on our understanding of hormonal regulation during puberty.

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the onset of puberty in the absence of developed primary sexual organs. This implies that there must be an alternative source of hormonal stimulation that can trigger the changes associated with puberty.

2. **Evaluating the Options**:
- **Option 1: Stimulation of the Adrenal Cortex**:
- The adrenal cortex produces sex hormones, including androgens (like testosterone) and estrogens. These hormones play a crucial role in the development of secondary sexual characteristics and the onset of puberty. Therefore, this option is plausible.

- **Option 2: Stimulation of the Adrenal Medulla**:
- The adrenal medulla primarily secretes catecholamines (like adrenaline and noradrenaline), which are involved in the body's fight-or-flight response. These hormones do not play a direct role in sexual development or puberty. Thus, this option is incorrect.

- **Option 3: Excessive secretion from gonads**:
- If the primary sexual organs (gonads) do not develop, excessive secretion from them cannot be a cause for puberty. This option is also incorrect.

- **Option 4: None of the above**:
- Since we have identified that the first option is a valid cause for the onset of puberty, this option is incorrect.

3. **Conclusion**: Based on the evaluation, the correct answer is **Option 1: Stimulation of the Adrenal Cortex**. This stimulation can lead to the production of sex hormones that may trigger the onset of puberty even in the absence of developed primary sexual organs.

### Final Answer:
**Stimulation of the Adrenal Cortex**.