Q. Read the following statements and find out the incorrect statements. . Small intestine is distinguished into three regions—a shaped duodenum, a long coiled middle portion jejunum and a highly coiled ileum.
. Oesophagus opens into the cardiac part of stomach.
. Arrangement of teeth in each half of upper and lower jaw is represented by dental formula.
. Rectum is a small sac which hosts some symbiotic micro-organisms.

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Solution:

. Small intestine is distinguished into three regions, a shaped duodenum, a long coiled middle portion jejunum and a highly coiled ileum.
. Caecum is a small blind sac which hosts some symbiotic micro-organisms