Which of the following statements regarding different barriers of innate immunity is not correct ?

Options

A. Acid present in the stomach, saliva in the mouth, tears from the easy prevent the growth of micre-organism and constitute physiological barriers of our body.
B. Mucous membrane lining the respiratory, gastrointestinal and urinogenital tracts helps in trapping the micobes and constitute physiological barriers of our body.
C. Certain types of lecucytes such as polymorphonuclear leucocytes (PMBL-neutrophila) and lymphocytes such as notural killer cells, constitute cellular barriers of our body.
D. Virus-infectted cells secrete protains caled interferons which protect non-infected cells from further viral infection and constitute cytokine barriers of our body.

Answer

To solve the question regarding which statement about the barriers of innate immunity is incorrect, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understand the Question**: We need to identify the statement that is NOT correct regarding the barriers of innate immunity.

2. **Analyze Option 1**:
- The statement mentions that "acid present in stomach, saliva in the mouth, and tears from the eyes prevent the growth of microorganisms and constitute physiological barriers."
- This statement is correct. The stomach acid (HCl) and enzymes in saliva and tears (like lysozyme) do indeed act as physiological barriers.

3. **Analyze Option 2**:
- The statement says "mucous membrane lining the respiratory, gastrointestinal, and urogenital tract helps in trapping the microbes and constitute physiological barriers."
- This statement is incorrect. Mucous membranes are considered physical barriers, not physiological barriers. They trap pathogens but do not involve biochemical processes like physiological barriers do.

4. **Analyze Option 3**:
- The statement refers to "certain types of leukocytes such as polymorphonuclear leukocytes, neutrophils, and natural killer cells constituting cellular barriers."
- This statement is correct. These leukocytes play a crucial role in the immune response and act as cellular barriers.

5. **Analyze Option 4**:
- The statement mentions "virus-infected cells secrete proteins called interferon which protect non-infected cells from further viral infection, constituting a cytokine barrier."
- This statement is also correct. Interferons are indeed secreted by infected cells to protect neighboring cells from viral infections.

6. **Conclusion**:
- After analyzing all options, we find that the second option is the incorrect statement regarding the barriers of innate immunity.

### Final Answer:
The incorrect statement regarding different barriers of innate immunity is **Option 2**: "mucous membrane lining the respiratory gastrointestinal urogenital tract helps in trapping the microbes and constitute physiological barriers."

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