Select the incorrect statement.

Options

A. Salmon migrates from freshwater to sea for breeding.
B. Arctic tern travels the longest migration route by an animal.
C. Seasonal mass movement of animals from one place to another is called migration.
D. Chameleon changes colour of its skin to blend with the surroundings.

Explanation

To solve the question of identifying the incorrect statement, we will analyze each statement provided and determine its accuracy.

### Step-by-Step Solution:

1. **Understand the Statements**: We have several statements related to animal behavior and migration. We need to evaluate each one to find the incorrect one.

2. **Evaluate Statement 1**: "Salmon migrates from freshwater to sea for breeding."
- **Analysis**: This statement is incorrect. Salmon actually migrate from the sea (saltwater) to freshwater rivers to spawn (breed). Therefore, this statement is false.

3. **Evaluate Statement 2**: "Arctic tern travels the longest migration route by an animal."
- **Analysis**: This statement is correct. The Arctic tern migrates from the Arctic Circle to the Antarctic Circle, covering a distance of about 30,000 km, making it the longest migration route known for any animal.

4. **Evaluate Statement 3**: "Seasonal mass movement of animals from one place to another is called migration."
- **Analysis**: This statement is also correct. Migration is defined as the seasonal movement of animals from one habitat to another, often for breeding or feeding purposes.

5. **Evaluate Statement 4**: "Chameleon changes color of skin to blend with the surrounding."
- **Analysis**: This statement is correct. Chameleons have the ability to change their skin color for camouflage, which helps them blend in with their environment.

6. **Conclusion**: After evaluating all the statements, the incorrect statement is the first one: "Salmon migrates from freshwater to sea for breeding."

### Final Answer:
The incorrect statement is: **"Salmon migrates from freshwater to sea for breeding."**