Ls 1 Lecture May 12 Cnidarians

Front 1

cnidaria means

Back 1

stinging thread

Front 2

how many germ layers do cnidarians have?

Back 2

2

Front 3

cniadarians are ________ly symmetrical

Back 3

radially

Front 4

mesoglea

Back 4

middle gelatinous layer

Front 5

cnidarians are:
herbivores, carnivores, omnivores...?

Back 5

carnivores

Front 6

do cnidarians have organ systems?

Back 6

no, they have nerve nets

Front 7

what are the two cnidarian body morphs?

Back 7

medusa and polyp

Front 8

do cnidarians have an anus?

Back 8

no, just a gut

Front 9

the gastrodermis completely surrounds the ___

Back 9

gut

Front 10

nematocysts are contained in the

Back 10

cnidocyte

Front 11

nematocysts are used for

Back 11

defense and prey capture

Front 12

the trigger loaded with nasty toxins of the nematocyst responds to

Back 12

tactile and chemical stimulants, which lead to osmotic pressure and then explosion!

Front 13

the 4 classes of cnidarians are

Back 13

class hydrozoa
class scyphozoa
class anthozoa
class cubozoa

Front 14

hydras, hydroids, and siphonophores are in class ___

Back 14

hydrozoa

Front 15

jellyfish are in class______

Back 15

scyphozoa

most homogeneous class

Front 16

anemones, corals, and gorgonians are in class

Back 16

anthozoa

Front 17

box jellies and sea wasps are in class

Back 17

cubozoa

Front 18

which body morph is dominant in class hydrozoa?

Back 18

polyp

Front 19

what type of colonies does class hydrozoa have?

Back 19

clonal

Front 20

polymorphic: definition

Back 20

colonies have 2 (or greater) structurally and functionally different types of individuals

polymorphs are identical genetically, but different parts of the genome are turned on

Front 21

which is the smallest class of cnidarians?

Back 21

scyphozoa

Front 22

which body morph is dominant in class hydrozoa?

Back 22

medusa

Front 23

which is the largest class of cnidarians?

Back 23

class anthozoa

Front 24

which morph is absent in class anthozoa?

Back 24

medusa

Front 25

zooanthellae

Back 25

photosynthetic microorganisms that live symbiotically in the tissues of organisms such as corals and jellies

Front 26

which class has a symbiotic relationship with zooanthellae?

Back 26

anthozoa

Front 27

clone

Back 27

genetically identical; derived asexually from a single individual

Front 28

colony

Back 28

animals connected organically, usually by living extensions of bodies or secretions

Front 29

true or false: all colonies are clones

Back 29

true

Front 30

true or false: most hydroids are aggregates

Back 30

false, most hydroids are colonies

Front 31

true or false: all corals are colonies

Back 31

true

Front 32

aggregate

Back 32

a dense cluster of individuals

Front 33

the man-of-war's (Physalia, sinophore colony)gas-filled float is a highly modified...

Back 33

polyp or medusa

Front 34

the man-of-war's (Physalia, sinophore colony) includes 3 types of polyps, which?

Back 34

reproductive, feeding, and defensive polyps loaded with nematocytes (10s of meters long)

Front 35

the polyp and medusa are diploid/haploid

Back 35

both are diploid, gametes are haploid

Front 36

true or false: hydroids undergo an alternation of generations

Back 36

true between asexual polyp and sexual medusa

Front 37

true or stony corals are colonial polyps embedded in _______ skeleton

Back 37

CaCo3

Front 38

true or stony corals live in _______,______,_____ waters

Back 38

clear, warm, low productivity

Front 39

describe the symbiotic zooantellae relationship with corals

Back 39

unicellular plants use the coral metabolic wastes and corals get fatty acids, amino acids, glucose, etc