Answer :

The gizzard in cockroach's alimentary canal is a structure specialized for grinding food. Its interior is lined with chitinous ridges and muscles that mechanically break down food particles, providing more surface area for digestive enzymes and enhancing digestion's efficiency.

The gizzard is a part of the alimentary canal in a cockroach and many other birds and insects. It plays a crucial role in digestion as a specialized structure for grinding food. The interior of the gizzard is lined with chitinous ridges or teeth and muscle fibers. These hardened structures and muscles help the gizzard in mechanically breaking down the food particles into smaller ones. This is important as it allows for more surface area for the action of digestive enzymes, enhancing the efficiency of chemical digestion. Hence, the presence and structure of the gizzard in the alimentary canal of a cockroach make it suitable for grinding food.

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