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Classification
Scientific Name: Periplaneta Americana
External features used to identify the sexes
Posterior dorsal view of a male cockroach.
External feature
Anterior view of the head of a cockroach
A drawing of the external features of one pair of the wings of the cockroach.
Outer wing (Fore) Inner wing (Hind)
Rigid/stiff Flexible
Chitinous/thick Membrane/thin
Opaque Translucent
Smaller surface Large surface
Curved Flat
Oval shaped Triangular shaped.
Structure of the alimentary canal
Functions of parts of the alimentary canal and zoology.
Mouth
During chewing; the food is mixed with saliva, brought into the pre-oral cavity by the common salivary duct.
Salivary amylase converts starch receptacle.
Crop
Enzymes from the gut also come into the crop through the gizzard for digestion of some fats and proteins. The gizzard helps to masticate the food further by chitinours teeth and is filtered by the bottles.
Mid-gut (mesenteren).
The food, here mixes with secretions from the mid-gut lining and from the hepatic/digestive caroa which contains many enzymes e.g.
Ileum. The end of the mid gut whose lining absorbs digested food.
…..gut (color). The undigested food passes into the hind gut tat absorbs H20.
Rectum
The feaces are temporarily stored in the rectum from where it is passed out at intervals through the anus.
Malphigian tubules are excretory organs attached to the ileum responsible for uric acid excretion but is not part of the alimentary canal.
The water in the uric acid can further be absorbed by the rectal glands in rectum to produce solid uric acid.
Mouth parts of cockroach under light microscope/hand lens after separation.
Functions of major mouth parts and adaptations.
The THORAX
THE LEGS
– Each is jointed with 5 segments.
Summary of differences between thoracic and abdominal spiracles.
Thoracic Abdominal
– 2 pairs – 8 pairs
– Larger – Smaller
– Oval shaped – Annular or round shapes
REPRODUCTIVE SYSTEM
Functions of draws
– Enables it to grip rough surfaces
Function of arolum
NB A combination of the above help the cockroach run first on any surface, even upside down, in coils etc.
Structure of the leg
ABDOMEN
Each segment had dorsal tergum, ventral sternum and a narrow membranous plauron on each size joining them
The 10th segment bears a pair of anal cerci in both sexes. Males have anal styles at the 9th segment which are absent in females.
The only 7 out of 10 segments are clearly visible in both cases
Circulatory system
Respiratory system
1a) How many parts of spiracles are found on; i) The thorax
) Remove another spiracle from the abdominal region mount on microscope. Draw and label.
Habitat of stomach. It is terrestrial living in narrow species eg behind cupboard
Adaptation’s to survive in the environment.
Male has and style for reproduction.
Non structural adaptations.
Economic importance.
Used as laboratory specimens