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Where do certain symbiotic microorganisms normally occur in human body?
A
Duodenum
B
Caecum
C
Oral lining and tongue surface
D
Vermiform appendix and rectum
Detailed Solution
The large intestine consists of the caecum, colon and rectum.
NCERT describes the caecum as a small blind sac which hosts some symbiotic micro-organisms.
The duodenum is the first part of the small intestine and receives bile and pancreatic juice; it is not the site of symbiotic microbes.
The vermiform appendix is a vestigial organ and the rectum only stores faeces temporarily.
Hence the symbiotic microorganisms normally occur in the caecum.
NCERT describes the caecum as a small blind sac which hosts some symbiotic micro-organisms.
The duodenum is the first part of the small intestine and receives bile and pancreatic juice; it is not the site of symbiotic microbes.
The vermiform appendix is a vestigial organ and the rectum only stores faeces temporarily.
Hence the symbiotic microorganisms normally occur in the caecum.