Question

14. An important difference b (Nematoda) is: Terence between the flatworms (Platyhelminthes) and the roundworms . Roundworms exhibit cephalization and bilateral symmetry, whereas flatworms do not. b. The flatworms are acoelomate, whereas the roundworms are eucoelomate c. Roundworms have a complete, one-way digestive tract, whereas flatworms have an incomplete 2-way digestive tract d. Flatworms are protostomes, whereas roundworms are deuterostomes e. Some flatworms are parasitic, but no roundworms are parasitic The defining feature of this group is a single posterior flagellum at some point in their life cycle: f. Ciliates g. Opisthokonts h. Amoebozoans i. Excavata j. Stramenopiles

Answer 1

14. An important difference between the flatworms and the roundworms is :

Option c – Roundworms have a complete, one way digestive tract, whereas flatworms have an incomplete 2 way digestive tract.

Acoelomate (flatworms) means that they do not have a body cavity whereas pseudo coelomate means they have a body cavity between mesoderm and endoderm.

Both flatworms and roundworms are protostomes.

Both flatworms and roundworms are either parasites or heterotrophs.

Roundworm has a complete digestive tract with separate openings whereas flatworms have only a single opening.

15. Answer g - Opisthokonts

The defining feature of “ Opisthokonts” is the presence of a single posterior flagellum at some point in their life cycle which they use to propel themselves. Movement of the posterior flagellum pushes the protist further.