Corpora allata are removed from a nymph. It will

Options

A. Remain nymph for life
B. Become adult
C. Change to next nymph immediately but will remain in that state
D. Die after some time.

Answer

### Step-by-Step Solution:

1. **Understanding Corpora Allata**:
- The corpora allata are endocrine glands located at the back of the brain in insects. Their primary function is to secrete juvenile hormone (JH).

2. **Role of Juvenile Hormone**:
- Juvenile hormone is crucial for maintaining the juvenile characteristics of nymphs. It prevents the process of metamorphosis, which is the transition from nymph to adult.

3. **Effect of Removal**:
- When the corpora allata are removed from a nymph, the secretion of juvenile hormone ceases. Without juvenile hormone, the nymph cannot maintain its juvenile characteristics.

4. **Consequences of No Juvenile Hormone**:
- The absence of juvenile hormone leads to the inability to undergo metamorphosis. The nymph will not develop into an adult form.

5. **Final State of the Nymph**:
- As a result, the nymph will remain in its juvenile state indefinitely, effectively becoming trapped in this stage without progressing to adulthood.

6. **Conclusion**:
- Therefore, the correct answer to the question is that the nymph will remain a nymph for life.