1. difference between digestive tract and
cavity
• A digestive tract (otherwise known as an Alimentary
canal) has two openings (a mouth and anus)
between its digestive tubes.
• Food processing occurs within a tube-like enclosure,
the alimentary canal, running lengthwise through the
body from mouth to anus.
• Examples are insects (cockroach), animals, human
beings.
• In digestive tract there are multiple organs to digest
the food and then transport it to various areas of the
body.
• Different organs have different functions. e.g. liver,

2. • A digestive cavity is a digestive sac with only a
single opening.
• In digestive cavity, food is ingested and
eliminated through the same opening
(examples would be hydra, marine jellyfish,
and Platyhelminthes, i.e. flatworms).
• Here they have a single opening which leads
to a pouch-like cavity serves as both mouth
and anus.

3. • No of openings
• Shape
• Simple vs complex
• Involvement of different organs
• Ability to extract nutrients