1) In the class Polychaeta the gametes accumulate in the ___________________ pri

Question

1) In the class Polychaeta the gametes accumulate in the ___________________

prior to the time at which they are shed to the outside during spawning.

(2) Among the several families of feather-duster polychaete worms, one

difference is in the type of materials which they use in _____________________ .

(3) The rhythmic filling and emptying of the _____________________________

with water by most holothuroideans provides those animals with the bulk of their

oxygen supply.

(4) With reference to the condition in the Urochordata it would seem that the

primitive function of pharyngeal gill slits among the chordates was most likely

their use in _______________________________________________________ .

(5) Among the errant polychaetes the ___________________________________

are used primarily as locomotory devices.

(6) The morphological transformation to a swimming, gamete-laden form at the

time of spawning for three families of polychaetes that typically are benthic

during the rest of their existence is known as ____________________________ .

(7) Zooids of the so called compound ascidians share, in addition to a common

tunic, a common ____________________________________________________

within each circlet of zooids in the colony.

(8) Bilateral symmetry among some of the adults is typical of the echinoderms

class ____________________________________________________________ .

(9) Among the so called ______________________________________________

polychaetes the organization of the body into a recognizable head, thorax, and

abdomen foreshadow the arthropod development of tagmatization.

(10) The individual zooids of members of the Phylum Bryozoa are enclosed

within a chitinous or calcareous _______________________________________ .

(11) The reduction of the coelomic cavity in the arms of ophiuroids relative to the

condition in asteroid echinoderms is primarily associated with a substantial

difference in the mode of _____________________________________________

of ophiuroids relative to asteroids.

(12) Among the Crinoidea the pinnate, multi-armed morphology of both sessile

and motile forms is a reflection of the reliance by this group on ______________

as the primary mode of nutrition.

(13) In the most primitive annelids, among the inclusions in each metamere are

two pairs of tubular ducts, the coelomoducts and the ______________________ .

(14) The occurrence of identical twinning (maternal twins) among deuterostomes

is a consequence of the fact that all deuterostomes exhibit ___________________

development.

(15) ______________________________________________________________

is a mode of food acquisition exhibited by many annelids that often involves the

deposition of castings of indigestible materials.

(16) Unlike that of most other members of the bilateria, the nervous system of the

echinoderms is characterized by very little ______________________________ .

(17) Although presumably homologous with the vertebrate thyroid gland, the

endostyle of the Ascidiacea produces ___________________________________

instead of thyroxine.

(18) A rather dramatic form of autotomy (the casting off of body parts) is the

phenomenon of _____________________________________________________

that is typical of many species of Holothuroidea.

(19) Among the so called oligomerous phyla the mesosome has a unit of coelomic

cavity within it referred to as the ______________________________________ .

(20) The sessile adult nature of the sea squirts does not prevent dispersion of

subsequent generations since these animals have free swimming ______________

larvae in their life cycle.

(21) The lophophore apparatus of the bryozoans and other lophophorates

functions primarily as a device for _____________________________________ .

(22) The invagination of ectoderm at the anterior of the gut tube during

development results in the formation of _________________________________

which in the case of arthropods means that the lining of this portion of the gut is

lost at each molt

Explanation / Answer

1. Polychaete gamets accumulates in the body cavity

2. Sabellids build tubes out of a tough, parchment-like exudate, strengthened with sand and bits of shell

3. Leathery skin

4. to filter food particles from the water.

5. Longitudinal muscles which have broken up into muscle blocks

6. Benthic Zone

7. Musculature is moderately developed with slender longitudinal bands

8. Echinodermata

9. Annelid worms

10. sheath of tissue, the zooecium

11. Sublethal predation

12. small particles of food from the sea water

13. Nephredia

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