In mammals a significant initial role in the digestion of milk is played by

Options

A. Rennin
B. Invertase
C. Amylase
D. Intestinal bacteria

Answer

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks which component plays a significant initial role in the digestion of milk in mammals.

2. **Analyzing the Options**: We have four options to consider:
- A) Renin
- B) Invertase
- C) Amylase
- D) Intestinal bacteria

3. **Evaluating Each Option**:
- **Option A: Renin**: Renin is an enzyme that plays a crucial role in the digestion of milk, particularly in curdling the milk protein caseinogen into a soluble form. This is a significant initial step in milk digestion.
- **Option B: Invertase**: Invertase is an enzyme that converts sucrose (a disaccharide) into glucose and fructose (monosaccharides). It is involved in carbohydrate digestion, not milk digestion.
- **Option C: Amylase**: Amylase is an enzyme that helps in the digestion of carbohydrates, specifically starches. It does not play a role in the digestion of milk.
- **Option D: Intestinal bacteria**: While intestinal bacteria contribute to the digestion process and the production of vitamins, they do not play a significant initial role in the digestion of milk.

4. **Identifying the Correct Answer**: Based on the analysis, option A (Renin) is the correct answer as it plays a significant initial role in the digestion of milk in mammals.

5. **Conclusion**: Therefore, the answer to the question is that in mammals, a significant initial role in the digestion of milk is played by **Renin**.

---