Midterm 4

Question 1

Protostome

Answer 1

spiral cleavage, mouth from embryonic blastopore

Question 2

Deuterostomia

Answer 2

Radial cleavage, anus from embryonic blastopore

Question 3

Lophophore

Answer 3

Crown of tentacles covered with cilia. Efficient feeding device. Cavity inside is part of coelom and. is fluid filled, acts as a gas exchange between environment and polemic fluid

Question 4

Trochophore

Answer 4

A free swimming, feeding larval. stage that was a ring of ciliated cells in front of mouth

Question 5

Protoroch

Answer 5

The ring of. cells around mouth. Mainly for locomotion but may be used for feeding

Question 6

Radula

Answer 6

Protrusible organ in Molluscs. Has chitinous teeth pointed backwards. Moved by the odontophore

Question 7

odontophore

Answer 7

Muscle that moves the radula. Found in Molluscs

Question 8

Mantle

Answer 8

Secrets the shell. Wraps around each side of the body.

Question 9

Mantle cavity

Answer 9

Space between the mantle and visceral mass. Houses the respiratory organs. Serves as a gas exchange. Digestive and reproductive systems empty into mantle cavity

Question 10

Torsion

Answer 10

Process of anus and mantle cavity rotating 180* to above the head. Occurs at larval stage of Gastropods. Avoids the possibility of Fouling

Question 11

Fouling

Answer 11

Waste washing back over gills

Question 12

Coiling

Answer 12

Shell spiralling for better weight distribution. Occurs at larval stage. Right side becomes squished,

Question 13

Biramous

Answer 13

Appendages with two distinct branches, found in crustaceans

Question 14

Uniramous

Answer 14

Appendages unbranched/ with a single branch. Found in myriapoda, insects (hexapods)

Question 15

Endostyle

Answer 15

One of the five chordate characteristics, ciliated sheet of mucous for food capture

Question 16

Anaspid

Answer 16

Skull with no openings in the temporal area behind the orbit, found in turtles, evolutionary skull of all vertebrates

Question 17

Diapsid

Answer 17

Skulls that have TWO temporal openings, one pair above cheek, one pair in the roof of the skull. Separated by a boney arch. Found in birds (Although highly modified) and all reptiles except turtles. Boney arch may have been lost in some species.

Question 18

Synaspid

Answer 18

A SINGLE pair of temporal openings located low on the cheeks and bordered by a boney arch. Found in all mammals and their extinct ancestors

Question 19

Amniotic egg layers

Answer 19

Characteristic of all amniotes. Have four layers: Amnion, Allantois, Chorion, Yolk sac

Question 20

Amnion

Answer 20

Encloses embryo in fluid, cushioning

Question 21

Allantois

Answer 21

Creates sac to store metabolic waste

Question 22

Chorion

Answer 22

Surrounds entire contents of egg. Forms a respiratory organ along with allantois; removing carbon and acquiring oxygen.

Question 23

Yolk sac

Answer 23

Also found in anamniotes, for nutrient storage, Larger in amniotes

Question 24

Jacobson’s organ

Answer 24

Detects heavy moisture-borne odour particles in the air. Found in serpents

Question 25

Pit organ

Answer 25

Located on the top of snakes heads, sensitive to radiant energy for temperature control

Question 26

Parts of feathers

Answer 26

Quill (Calamus), Shaft (Rachis) Barbs, Barbules, Vane

Question 27

Calamus

Answer 27

Quill, Hollow bit that emerges from kin follicle

Question 28

Rachis

Answer 28

Shaft, Continuation of the calamus (Quill)

Question 29

Barbs

Answer 29

Tiny Protrusion off of the rachis(Shaft)

Question 30

Barbules

Answer 30

Tiny hooks protrusions off of the barbs that interlink with other barbules

Question 31

Proboscis

Answer 31

Found in Nemertea and Acanthocephala. Long blind muscular tube used for food capture. In nermertea lies in interior cavity called Rhynchocoel. In Acanthocephala is ivanginable for parasitic attachment to host

Question 32

Rhynchocoel

Answer 32

Interior cavity that houses the proboscis. Enteriorly enclosed. within mesoderm herfroe a true coelom. Found above the gut.

Question 33

Setae

Answer 33

Tiny hairs. that. help anchor segments. during locomotion. Found in Annelids, but not the class containg leeches (Hirudinida)