The student was asked to classify Ascaris lumbricoides, distinguish between male and female Ascaris, and draw the head of a hookworm.

Here are the answers to your questions:

2. Classify Ascaris lumbricoides Phylum: Nematoda Class: Secernentea Order: Ascaridida Genus: Ascaris

3. Distinguish two differences and similarities each between the two sexes of Ascaris

   Differences:

   Male	Female
   1. Smaller in length and diameter.	1. Larger in length and diameter.
   2. Posterior end is curved ventrally and possesses copulatory spicules.	2. Posterior end is straight and conical.

   Similarities:

   1. Both sexes have a cylindrical, unsegmented body covered by a tough cuticle.
   2. Both possess a complete digestive system, including a mouth, pharynx, intestine, and anus.

4. Hookworm is a soil transmitted nematode, living in the intestine of man. Draw the head of the worm showing the recurved teeth from the provided specimen. As an AI, I cannot draw diagrams. However, a drawing of the head of a hookworm (specifically Ancylostoma duodenale, which has recurved teeth) would show:

   • A prominent, large buccal capsule (mouth cavity).
   • Two pairs of large, ventral, recurved teeth (hook-like structures) projecting into the buccal capsule.
   • A smaller dorsal tooth.
   • The mouth opening leading into the buccal capsule.