To answer the question regarding the important functions of lymph, we can analyze each of the provided options step-by-step:
### Step-by-Step Solution:
1. **Understanding Lymph**:
- Lymph is a colorless fluid that is part of the lymphatic system. It is similar to blood plasma but lacks red blood cells and platelets. It contains white blood cells (WBCs) and plays a crucial role in the immune system.
2. **Evaluating Option (i)**:
- "It absorbs and transports fat and fat-soluble vitamins from the intestine."
- This statement is correct. Lymph plays a significant role in the absorption of dietary fats and fat-soluble vitamins (A, D, E, K) from the intestines through specialized lymphatic vessels called lacteals.
3. **Evaluating Option (ii)**:
- "It regulates the pH of the body."
- This statement is less significant in terms of lymph's primary functions. While lymph can influence fluid balance and indirectly affect pH through its interactions with blood, it does not play a direct role in regulating body pH.
4. **Evaluating Option (iii)**:
- "It transports nutrients, hormones, etc., to the body cells."
- This statement is correct. Lymph helps transport various substances, including nutrients and hormones, to body cells, similar to the function of blood.
5. **Evaluating Option (iv)**:
- "It destroys invading microorganisms."
- This statement is also correct. Lymph contains lymphocytes, which are crucial for immune responses. Lymph nodes filter lymph and trap pathogens, which are then destroyed by immune cells.
### Conclusion:
Based on the evaluations:
- **Correct Options**: (i), (iii), and (iv) are important functions of lymph.
- **Incorrect Option**: (ii) does not represent a primary function of lymph.
Thus, the important functions of lymph are:
- (i) It absorbs and transports fat and fat-soluble vitamins from the intestine.
- (iii) It transports nutrients, hormones, etc., to the body cells.
- (iv) It destroys invading microorganisms.
### Final Answer:
The important functions of lymph are (i), (iii), and (iv).
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