chapter 31 Flashcards
animals that have no particular symmetry exhibit
asymmetry
which type of animal symmetry produces mirror images of each other no matter how the animal is sliced longitudinally?
radial symmetry
the term deuterostome refers to
the second embryonic opening becoming the mouth
which difference distinguishes protostomes from deuterostomes?
their embryonic development is different
which of the following is NOT true about protostomes?
the first opening during embryonic development becomes the anus
which of the following statements about sponges is NOT correct?
amoeboid cells capture food particles from the water
why are real bath sponges so soft?
the harder silica or calcium spicules are absent and the softer spongin remains
a recent study of the marine hawksbill turtle’s stomach contents revealed that sponges constitute a major portion of their diet. Sponge beds are generally protected from predators by the sponge’s calcium and silica crystals, but these were found in quantity in the turtles’ digestive systems. These structures that protect the sponges from most predators, but not turtles, are
spicules
which of the following organisms exhibit radial symmetry as adults?
cnidarians
which of the following statements is NOT correct about cnidaria?
the adult body is bilaterally symmetrical
the stinging cells or nematocysts are characteristics of
cnidarians
the mollusks look so different, and yet we can tell they are related because they all
have a mantle, visceral mass, and a foot
which of the following is NOT a characteristic of earthworms?
dorsal solid nerve cord
earthworms are
annelids
which type of organisms is characterized by having jointed appendages, ability to molt, and three sets of fused segments?
arthropods
