Complete the statement:
In Cockroach grinding of food particle is performed by __________ .

Explanation

**Step-by-Step Solution:**

1. **Understanding the Digestive System of Cockroach**: Begin by recognizing that the cockroach has a complex digestive system that includes several parts: the mouth, salivary glands, esophagus, crop, gizzard, midgut, and hindgut.

2. **Identifying the Role of Each Part**:
- The mouth is where food intake occurs.
- The salivary glands secrete saliva to aid in digestion.
- The esophagus serves as a passage for food from the mouth to the crop.
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