Endocrine glands of insects which secrete juvenile hormone are

Options

A. Corpora allata
B. Corpora albicans
C. Corpora myecaena
D. All the above

Answer

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks about the endocrine glands in insects that secrete juvenile hormone.

2. **Identifying Juvenile Hormone (JH)**: Juvenile hormone is crucial for regulating growth, reproduction, diapause (a period of suspended development), polyphenism (the occurrence of two or more distinct forms), and behavior in insects.

3. **Analyzing the Options**:
- **Option 1: Corpora Alata**: This is an endocrine gland located in the head of insects and is known to secrete juvenile hormone.
- **Option 2: Corpora Albicans**: This is not an endocrine gland but rather a scar on the surface of the ovary, which is a remnant of ovulation.
- **Option 3: Corpora Amylasea**: This refers to starch-like bodies and does not secrete juvenile hormone.
- **Option 4: All of the Above**: Since only Corpora Alata secretes juvenile hormone, this option is incorrect.

4. **Conclusion**: The correct answer is **Corpora Alata**, as it is the only gland listed that secretes juvenile hormone in insects.

### Final Answer:
The endocrine gland of insects that secretes juvenile hormone is **Corpora Alata**.

---