Hypothesis:
A test to determine whether grasshopper breathes through spiracles and if earthworms have respiratory system.
Materials
Dissecting kit
Scalpel blade
Pins
Dissecting Microsoft
Forceps
Dissecting board
Procedure I
Take a mature grasshopper from the rearing cage
Place it on the dissecting board with the ventral position facing up
Fix the grasshopper on the board with pins and start dissecting from upper region of the chest going downwards.
Care should be taken not to distort the internal organs.
Open up the cut region by pinning the outer sections on the board to expose the internal organs.
Procedure II
Repeat the same procedure for earthworm and dissect to view its internal organs.
Results
The respiratory system of the grasshopper is clearly seen as tracheal tubes running from the spiracles and extended to the lungs region. When looked under the dissecting microscope the trachea and tracheal tubules can be clearly seen. For the case of the earthworm, no respiratory system seen in its internal organs. Only the segmentation of the annulus seen under the microscope.
In conclusion, the hypothesis that grasshopper breathe through spiracles is supported. This is evident from the respiratory system emanating from the organs (spiracles).
The hypothesis that earthworms have a respiratory system is falsified as the dissection does not indicate presence of the system from the dissection.
Deductions
It is evident that grasshoppers have spiracles through which gaseous exchange takes place. This has been documented in many research works and entomology studies. Presence of the openings and air sacs served to support the hypothesis. In the case of earthworm, their respiratory system could not be seen as respiration takes place on the surface of the skin.
