If corpora allata are removed from the first instar of a nymph, then

Options

A. It will remain nymph forever
B. It will enter into the secondary stage of juvenile
C. It will become adult immediately
D. None

Answer

### Step-by-Step Solution:

1. **Understanding Corpora Allata**: The corpora allata is an endocrine gland found in insects, responsible for producing juvenile hormone. This hormone is crucial for regulating development and metamorphosis in insects.

2. **Role of Juvenile Hormone**: Juvenile hormone helps maintain the larval stage in insects. Its presence prevents the insect from maturing into the adult stage. When juvenile hormone levels are high, the insect continues to grow as a larva.

3. **Effect of Removal**: If the corpora allata is surgically removed from a first instar nymph (the initial stage of development), the production of juvenile hormone will cease. This lack of juvenile hormone will trigger the nymph to undergo metamorphosis prematurely.

4. **Outcome of Removal**: As a result of the removal of the corpora allata, the nymph will not remain in its larval stage. Instead, it will enter the next developmental stage and pupate, leading to the formation of a miniature adult.

5. **Conclusion**: Therefore, if the corpora allata is removed from the first instar of a nymph, the correct outcome is that the nymph will become an adult immediately.

### Final Answer:
If corpora allata are removed from the first instar of a nymph, it will become an adult immediately.