Which of the following statements is correct ?

Options

A. Parthenium is an endemic species of our country.
B. African catfish is not a threat to indigenous catifishes.
C. Steller's sea cow is an extinct animal.
D. Lantana is popularly known as carrot grass.

Explanation

To determine which of the provided statements is correct, we will analyze each statement one by one.

### Step 1: Analyze the first statement
The first statement claims that "Parthenium is an endemic species of our country."
- **Analysis**: Parthenium hysterophorus, commonly known as carrot grass, is not endemic to India. It is an exotic or alien species that was introduced to India, likely as a contaminant with imported wheat. Endemic species are those that are unique to a specific region and not found elsewhere. Therefore, this statement is **false**.

### Step 2: Analyze the second statement
The second statement states that "African catfish is not a threat to indigenous catfishes."
- **Analysis**: The African catfish (Clarias gariepinus) was introduced into Indian rivers and has become invasive. It competes with native catfish species, leading to a decline in their populations. Thus, this statement is also **false**.

### Step 3: Analyze the third statement
The third statement claims that "Steller's sea cow is an extinct animal."
- **Analysis**: Steller's sea cow was indeed an aquatic mammal that lived in the coastal waters of Russia. It was hunted to extinction shortly after its discovery. This statement is **true**.

### Step 4: Analyze the fourth statement
The fourth statement says "lantana is popularly known as carrot grass."
- **Analysis**: This statement is incorrect. The common name "carrot grass" refers to Parthenium, not lantana. Lantana is also an invasive weed but is not known as carrot grass. Therefore, this statement is **false**.

### Conclusion
After analyzing all the statements, the only correct statement is:
- **C. Steller's sea cow is an extinct animal.**