If juvenile hormone is absent when silkworm moults, it will

Options

A. Moult into another larval stage
B. Moult into pupa
C. Moult into adult
D. Die.

Answer

To solve the question regarding the effect of the absence of juvenile hormone during the moulting of a silkworm, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Role of Juvenile Hormone**:
- Juvenile hormone is crucial for regulating the growth and development of insects, including silkworms. It helps maintain larval characteristics and prevents premature metamorphosis.

2. **Identify the Moulting Process**:
- Moulting is a process where insects shed their exoskeleton to grow. In silkworms, this process can lead to different developmental stages: larval, pupal, or adult.

3. **Consider the Effects of Juvenile Hormone Absence**:
- If juvenile hormone is absent during the moulting phase, the silkworm will not maintain its larval characteristics. Instead, it will undergo a transformation.

4. **Determine the Outcome of Moulting**:
- Without juvenile hormone, the silkworm will not be able to moult into another larval stage. Instead, it will transition into the pupal stage, as the absence of this hormone signals the insect to proceed with metamorphosis.

5. **Conclusion**:
- Therefore, if juvenile hormone is absent when a silkworm moults, it will moult into a pupa.

### Final Answer:
If juvenile hormone is absent when silkworm moults, it will moult into pupa.

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