Q.
The given figure shows the digestive system of cockroach
with few structures marked as A, B, C and D.
Identify structures A to D.
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134
Structural Organisation in Animals
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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.
