9. Long answer question I

 

a. In leeches, do have trueno true blood vessels.
 
b. In leeches, the blood vessels are replaced with haemocoelic canalssuprapharyngeal canal, which replace the blood vessels. The haemocoelic fluidpericardial fluid fills these channels. The coelomic fluid contains haemoglobinhaemocyanin.

  

c. The longitudinal canals are divided into sixfour sections. One is dorsal and lies belowabove the alimentary canal, while the other is ventral and lies abovebelow it. The remaining two are between the alimentary canal and are called anteriorlaterals. At the back of the mouth, the four canals are connected.

  

d. The two channels are present on the lateral side of  the alimentary canal, which functions as a lungsheart.

e. All four channels are connected posteriorly in the 26'th24'th segment.