Name the masticatory part of a alimentary canal of earthworm.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for the masticatory part of the alimentary canal of an earthworm. The term "masticatory" refers to the part of the digestive system that is involved in the mechanical breakdown of food, essentially the chewing process.

2. **Identifying the Alimentary Canal Structure**: The alimentary canal of an earthworm consists of several parts, including the mouth, pharynx, crop, gizzard, and intestine. Each part has a specific function in the digestion process.

3. **Recognizing the Masticatory Organ**: In earthworms, the gizzard is the specific part of the alimentary canal that acts as the masticatory organ. It is responsible for grinding and breaking down food into smaller, simpler particles.

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