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  4. The given figure shows the digestive system of cockroach with few structures marked as A, B, C and D. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/biology/f31154f154e48d54e59d0e6d7848bfa8-.png /> Identify structures A to D.

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Q. The given figure shows the digestive system of cockroach with few structures marked as A, B, C and D.
image
Identify structures A to D.

Structural Organisation in Animals

Solution:

A - Crop; B - Gizzard; C - Hepatic cecae; D - Malpighian tubule Crop is a sac-like structure which store food. The crop is followed by gizzard and proventriculus. The gizzard has an outer layer of thick circular muscles and thick inner cuticle; forming six highly chitinous plate called teeth. Food particles are ground in the gizzard. At the junction of foregut and midgut, a ring of 6 - 8 blind tubules are present. These are called gastric or hepatic cecae and secrete digestive juice. Malpighian tubules are the excretory organs which absorb nitrogenous wastes and convert them into uric acid. Uric acid is excreted out through the hindgut.