Page 190 - Biology_F5

Comparative studies of natural groups of organisms

Antenna
Head
Compound eye
Thorax segments
Fore wing
FOR ONLINE READING ONLY
Abdomen segments
Jointed legs
Hind wing

Cercus

(a)

Antenna Antenna
Head Head
Compound eye Compound eye
Mouth parts Mouth parts

Walking leg Walking leg
Abdomen
Abdomen
Cercus Cercus
Anal style

(b) (c)
Figure 3.53: Structure of a cockroach (a) dorsal view (b) male ventral view (c) female ventral view

Digestive system of a cockroach and pharynx) are found inside the head
The alimentary canal of the cockroach is capsule and not visible in the dissected
long and coiled tubular structure starting at cockroach, while the other three parts
the mouth opening. It is divided into three are visible. The gizzard is muscular
main parts, namely foregut (stomodeum), and internally provided with six cutical
midgut (mesenteron or ventriculus), pointed teeth for crushing the food.
and hindgut (proctodeum). The foregut
is differentiated into five parts: Buccal The midgut is short and tubular lined
chamber, pharynx, oesophagus, crop, and with glandular endoderm. At the anterior
gizzard. The fist two parts (buccal cavity end of the midgut there are eight blind

Form Five Student’s Book
183