Cnideria

Question 1

What are the two main tissues of a cnidarian?

Answer 1

gastroderm and epidermis

Question 2

what process during development do we get endoderm and ectoderm?

Answer 2

gastrulation

Question 3

what shrinks during blastulation?

Answer 3

blastocoel

Question 4

blastocoel will eventually be replaced by?

Answer 4

mesoglea

Question 5

what kind of cells will we find on the epidermis and the gastrodermis?

Answer 5

cnidocytes

Question 6

inside a cnidocyte we will find what?

Answer 6

cnida

Question 7

what is the typical name for a harpoon cnida that is typically called what?

Answer 7

nematocyst

Question 8

What is it called when blastoderm fold inward forming gastrula?

Answer 8

gastrulation

Question 9

cnidarians that are barely mobile are also called what?

Answer 9

pelagic

Question 10

cnidarians that are unable to swim against current are known as what?

Answer 10

planktonic

Question 11

what is the term for two basic body forms?

Answer 11

dimorphism

Question 12

what is the term for two embryonic cell layers?

Answer 12

diploblast

Question 13

about how many species are there of cnidarians?

Answer 13

9000+

Question 14

what are the habitats of cnidarians?

Answer 14

entirely aquatic and mostly marine

Question 15

modified cilliim trigger mechanism on cnidocytes are called?

Answer 15

cnidocil

Question 16

cells that secrete enzymes for extracellular digestion and are found in gastrovascular cavity are called?

Answer 16

gland cells

Question 17

cells that allow organism to contract tenticles to pull in food that run longitudinally up and down the body are called?

Answer 17

epithelial muscular cells

Question 18

what are three characteristics of cnidarian nervous tissue?

Answer 18

diffuse, two way, unmyelinated

Question 19

nerve net interfaces with these three cells

Answer 19

sensory cells, cnidocytes, epitheliomuscular cells

Question 20

nerve cell clusters found in some medusa that may have chemoreceptors are called

Answer 20

rhopalia

Question 21

chemoreceptors that sense gravity

Answer 21

statocysts

Question 22

chemoreceptors that sense light

Answer 22

ocelli

Question 23

during the typical lifecycle of polyps and medusae, the zygote develops into ________

Answer 23

planula larvae

Question 24

when a species has separate male and females it is known to be

Answer 24

dioecious

Question 25

an example of a polyp colony that is not sessile

Answer 25

portuguese man-o-war

Question 26

what are the four polyp types

Answer 26

single gas filled, feeding, defense, reproductive

Question 27

_____________ digestion occurs in cavity

Answer 27

extracellular

Question 28

____________ digestion occurs in gastrodermal cells

Answer 28

intracellular

Question 29

all excretion and respiration done by

Answer 29

diffusion

Question 30

why don't cnidarians need specialized organs like we do?

Answer 30

high surface area and low matabolism

Question 31

a narrowing of the oral surface of the bell, to help create thrust

Answer 31

velum

Question 32

an extension of the mouth opening, may have its own tentacles or "arms"

Answer 32

manubrium

Question 33

multiple kinds of polyps in the same colony

Answer 33

polymorphic (hydrozoans)

Question 34

polyps that have a non-living, chitinous shell are?

Answer 34

thecate (hydrozoans)

Question 35

Some colonies are polymorphic. __________ are reproductive medusae factories.

Answer 35

Gonangia (hydrozoans)

Question 36

Some colonies are polymorphic. ___________ are simple polyps.

Answer 36

Hydranths (hydrozoans)

Question 37

hydra, lobelia, physalia (man-o-war) are all examples of which class of cnideria

Answer 37

hydrozoa

Question 38

all marine, solitary, medusa dominate, reduced or absent polyp stage, velum absent, rhopalia present, mesoglea often quite substantial, conspicuous oral arms

Answer 38

scyphozoa

Question 39

freshwater and marine, typically dimorphic, often colonial, some colonies are thecate, multiple types of polyps in same colony

Answer 39

hydrozoa

Question 40

all marine, square shaped bell, solitary, medusa dominate, advanced image capturing eyes with cornea and lens in rhopalia, velum absent (but similar structure velarium is present and functions the same), some are highly toxic

Answer 40

cubozoa

Question 41

all marine, no medusae, sea pens, gorgonians, gastrovascular cavity suspended by septa, gonads are present polyps, derived from endoderm/gastroderm

Answer 41

anthozoa

Question 42

hard corals are polyp colonies that secrete a calcium carbonate ____________

Answer 42

exoskeleton (anthozoa)

Question 43

most corals are extensively mutualistic with ______________, primarily dinoflagellates

Answer 43

zooxanthellae (anthozoa)

Question 44

a reef tank is really a phylum cnideria, class _________ display

Answer 44

anthozoa

Question 45

___________ and other cilia for increased circulation, hydrostatic skeleton

Answer 45

siphonoglyph

Question 46

_________ increase digestive surface area, contain gland cells and cnidocytes

Answer 46

secondary or partial septa