The undigested matter of the ingested food is called______.

Explanation

**Step-by-Step Solution:**

1. **Understanding Digestion**: When food is ingested, it goes through a process of digestion where it is broken down into smaller, absorbable components. This process occurs primarily in the stomach and small intestine.

2. **Absorption of Nutrients**: During digestion, nutrients from the food are absorbed in the small intestine. This includes carbohydrates, proteins, fats, vitamins, and minerals that the body needs for energy and growth.

3. **Undigested Matter**: Not all parts of the ingested food can be digested or absorbed. The parts that remain undigested after the digestive process are what we refer to as waste.

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