Choose the true statements .
Innate immunity is accomplished by providing different types of barriers.
Acquired immunity is present from the birth and is inherited from parents.
III. Sweat, tears, acid in the stomach and saliva prevent microbial growth.

Options

A. I and III
B. I and II
C. II and III
D. All of these

Answer

To determine which statements are true, let's analyze each statement step by step:

### Step 1: Analyze the First Statement
**Statement:** Innate immunity is accomplished by providing different types of barriers.

**Analysis:**
- Innate immunity is indeed characterized by various barriers that protect the body from pathogens. These barriers include physical barriers (like skin), physiological barriers (like sweat and tears), cellular barriers (like immune cells), and cytokine barriers (like interferons).
- **Conclusion:** This statement is **true**.

### Step 2: Analyze the Second Statement
**Statement:** Acquired immunity is present from birth and is inherited from parents.

**Analysis:**
- Acquired immunity is not present at birth; it develops as a response to exposure to pathogens. It involves the body’s ability to remember previous infections and respond more effectively upon re-exposure. This type of immunity is gained through experiences, not inherited from parents.
- **Conclusion:** This statement is **false**.

### Step 3: Analyze the Third Statement
**Statement:** Sweat, tears, acid in the stomach, and saliva prevent microbial growth.

**Analysis:**
- These substances are indeed part of the innate immune system. They contain enzymes and acids that help break down and destroy pathogens, thus preventing infections. For example, sweat and tears contain lysozymes that can break down bacterial cell walls.
- **Conclusion:** This statement is **true**.

### Final Conclusion
- The true statements are:
- Statement 1: True
- Statement 2: False
- Statement 3: True

Thus, the correct answer is that statements 1 and 3 are true.

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