<prompt> The normal habitat of giardia is-Duodenum and jejunumStomachCaecumIleum  <response>: Ans. is a i.e., Duodenum and jejunum o Giardia is a flagellate protozoao It is the only common protozoa that inhabits the duodenum and jejunum upper small intestine of human.o Infective form - Cysto Mode of transmission - Ingestion of cystMorphologyo G Iambi ia exists in two forms.1 Trophozoite It is tennis or badminton racket shapedpiriform shapedtear drop shaped in frontal view and spoon shaped sickle in lateral view. It is bilateral symmetrical and all organs of body are paired with :i Two nucleic,ii Four pairs of flagella,iii Two axostyles,iv Two parabasal bodies,v Two sucking discsTrophozoite show falling-leaf motility.2 Cyst: It is oval in shape and contains 4 nuclei, remains of flagella and axostyles. 