differentiate between -
1)food canal and food pipe 
2)digestive system and alimentary canal
3)food canal ,digestive system and alimentary canal

Dear student, 
​Please find below the solution to the asked query        

1. Food canal is the long tube in the body that starts from the mouth and terminates at anus. Food travels through this canal during its digestion.
Food pipe, also known as oesophagus or gullet is the tube that carries food from mouth to stomach.  

2. Alimentary canal is the passage along which food passes for digestion. It is also known as the gastrointestinal tract and extends from mouth to anus. Alimentary canal includes, pharynx, oesophagus, stomach, small intestine, large intestine, rectum, anus.

Whereas the Digestive system of man includes the alimentary canal and the digestive glands. The digestive glands are salivary glands, liver, pancreas, gastric glands and intestinal glands.

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Hope this information will clear your doubts about the topic.    Regards