Echinoderms

An evolutionary advance that first appeared in echinoderms wasa. radial symmetryb. one-way digestive systemc. external digestiond. endoskeleton

The "spiny skin" for which echinoderms are named refers to thea. extended skin gillsb. protruding tube feetc. rigid tentaclesd. chitinous exoskeletone. calcium-rich endoskeleton

The only living echinoderms that are fully sessile are thea. sea liliesb. brittle starsc. feather starsd. sand dollarse. sea cucumbers

Some sea stars digest bivalve mollusksa. in the mouth regionb. in the mollusk shellc. within their gastrovascular cavityd. in a digestive space in the central diske. in their water vascular system

The _______________ comprise the largest class of echinoderms in terms of numbers.a. brittle starsb. sand dollarsc. sea urchinsd. sea liliese. sea stars

Sea urchins move about bya. tentaclesb. flexible armsc. movable spinesd. small pincherse. extruding slime

Most reproduction in echinoderms isa. sexual and externalb. hermaphroditicc. asexual by fragmentationd. parthenogenice. sexual and internal

Which of the following is not descriptive of deuterostomes?a. embryo divides by radial cleavageb. larva is a trochophorec. anus develops from the blastopored. includes echinoderms and chordates

Echinoderms are most closely related to: a. roundworms b. mollusks c. annelids d. arthropods e. chordates

Early embryonic development of echinoderms is similar to that found in a. gastropods b. arthropods c. cephalpods d. humans e. other protostomes

Which of the following is not an echinoderm?a. sea urchinb. sea starc. octopusd. sea cucumber 

Which of the following is not characteristic of the sea stars?a. water vascular systemb. central disk with five or more armsc. notochordd. spiny skeletone. tube feet

The larval stage of a sea stara. Has radial symmetryb. Has pentaradial symmetryc. Has bilateral symmetryd. Is symmetrical

The water vascular system is characteristics of:a. Echinoderms onlyb. Echinoderms and chordatesc. Chordates onlyd. Arthropods only

The water vascular system:a. Is used to distribute water to the tube feetb. Is used to regenerate body partsc. Is used to filter feedd. Is used for reproduction

Which of the following is not an example of an echinoderm?a. Sea starb. Sea lillyc. Sea cucumberd. Sea squirt

In vertebrates the blastopore becomes the anus, and during cleavage, the regulatory signal in the egg are evenly distributed in the cells. An invertebrate phylum sharing these characteristics is the:a. Arthropodab. Nematodac. Annelidad. Molluscae. Echinodermata