Which hormone controls the metamorphosis from pupa to image in housefly ?

Options

A. ACTH
B. Estradiol
C. Juvenile hormone
D. GH

Answer

**Step-by-Step Solution:**

1. **Understanding Metamorphosis**: Metamorphosis is the biological process through which an organism undergoes significant physical changes from its early developmental stages to its adult form. In the case of houseflies, this process includes several stages: egg, larva (maggot), pupa, and finally adult (imago).

2. **Identifying the Stages**: The life cycle of a housefly progresses from eggs to maggot larvae, then to pupae, and culminates in the adult stage. The question specifically asks about the transition from the pupal stage to the adult stage.

3. **Hormonal Regulation**: The metamorphosis process is regulated by hormones. In insects, several hormones play crucial roles, but we need to identify which hormone is responsible for the transition from pupa to imago in houseflies.

4. **Evaluating Hormones**:
- **ACTH (Adrenocorticotropic Hormone)**: This hormone is not found in insects and is primarily associated with vertebrates.
- **Estradiol**: This hormone is present in female insects and is involved in reproductive processes, but it is not primarily responsible for metamorphosis.
- **Juvenile Hormone**: This hormone is crucial for insect development and is produced by the corpora allata, an endocrine gland located near the brain. It plays a significant role in regulating growth and metamorphosis in insects.
- **Growth Hormone**: This hormone is mainly found in mammals and does not play a role in insect metamorphosis.

5. **Conclusion**: The hormone responsible for controlling the metamorphosis from pupa to imago in houseflies is the **Juvenile Hormone**.

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