Question

18. Nematoda and Arthropoda are considered "sister phyla" because a. They both must moult their external cuticle to allow for growth b. They are both pseudocoelomate c. They both exhibit segmentation (metamerism) d. They both have trochophore larvae e. They are both deuterostomes 19. What part of a sponge traps its food? The mobile amoebocytes (amoeboid cells) The choanocytes The spongocoel The osculum The inhalant pores

Answer 1

Ans1) a

Nematoda-

:Pseudocoelomate,

:unsegmented,

:dont have trochophore larvae(larvae of nematode eg:rhabditid,rhabditoid )

:Protostomes

Arthropoda

:coelomate

:segmented

:dont have trochophore larvae(larvaes are eg:wriggler,caterpillar etc)

:protostome

Ans 2)b

:amoebocyte cells are totipotent motile cells which helps in digestion,regeneration etc

:spongocoel:body cavity of sponges

Osculum:mouth of sponge from which water from spongocoel exits

Ostia:pores from which water enters spongocoel