In a accordance with the study of industrial melanism in England , which of these is NOT correct ?

Options

A. Before industrialization , light-winged month were more on trees than dark-winged moths .
B. Dark winged or melanic moths were a mutant variety.
C. After industrialization , melanic moths reduced number.
D. Lichens could grow over tree trunk in a non-polluted atmosphere

Answer

To solve the question regarding the study of industrial melanism in England and identify which statement is NOT correct, we will analyze each option step by step.

### Step 1: Understand Industrial Melanism
Industrial melanism refers to the phenomenon where darker-colored individuals of a species become more common in industrial areas due to pollution. This is particularly noted in moths, such as the peppered moth, where darker variants became more prevalent due to the soot from industrial activities.

### Step 2: Analyze Each Option
1. **Option 1**: "Before industrialization, light-winged moths were more common on trees than dark-winged moths."
- This statement is **correct**. Before industrialization, the environment was cleaner, and the light-colored moths were better camouflaged against the light-colored tree bark.

2. **Option 2**: "Dark-winged or melanistic moths were a mutant variety."
- This statement is also **correct**. The dark-winged moths are indeed a mutant variety that arose due to genetic mutations.

3. **Option 3**: "After industrialization, melanistic moths reduced in number."
- This statement is **incorrect**. After industrialization, the number of melanistic moths actually increased due to the pollution darkening the tree trunks, making them less visible to predators.

4. **Option 4**: "Lichens could grow over a tree trunk in a non-polluted atmosphere."
- This statement is **correct**. Lichens are sensitive to pollution, and they thrive in clean, non-polluted environments.

### Conclusion
The statement that is NOT correct is **Option 3**: "After industrialization, melanistic moths reduced in number."