function of post and preanal papillae in ascaris
Answers
Answer:
ASCARIS – THE ROUND WORM
Ascaris lumbricoides is known as roundworm that is commonly found as intestinal parasite in vertebrates like man, pig, cattle etc. It is cosmopolitan in distribution but abundant in tropical countries.
MORPHOLOGY
Ascaris is a cylindrical worm, white to light pinkish in colour, tapering at both ends. Female measures 30-40 cm and male 15-30 cm. Posterior end of male is curved.
Four longitudinal streaks run through the body. The triangular mouth is surrounded by one mid-dorsal and two ventrolateral lips. The dorsal lip has two double sensory papillae and ventrolateral lip carries one double sensory papilla each. The ventrolateral lips also have a lateralpapilla each and a chemoreceptor called amphid. There is a pair of cervical papillae and a pair of cephalic papillae on the dorsal side of the head.
Explanation:
papillae are in the form of small villi situated on different body parts
