Question

Ascaris has three lips which are positioned as

• A. One median dorsal and two ventrolateral
• B. All dorsal
• C. Two lateral and one ventral
• D. Two dorso-lateral and one median ventral

Answer 1

The correct option is A One median dorsal and two ventrolateral

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 lateral papilla 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.

So, the correct answer is 'One median dorsal and two ventrolateral'.