Chapter 25, Problem 29A

Summary Introduction

To fill:

The given blank with the correct term.

Introduction:

The tooth is the hard structure present n mouth that aids in the mastication and breaking down of the food in smaller pieces. Hence, they are involved in machinal breakdown of the food material.

Explanation of Solution

The tooth is the structure that helps in the grinding of the bigger food material. Similar to the teeth, there is a structure called gizzard present in the earthworm. The gizzard helps in the mechanical breakdown of the food material. Hence, the blank can be filled with gizzard.