chapter 35 section 2

Question 1

polyp

Answer 1

a polyp is a vase shaped cnidarian specialized for sessile existence.

Question 2

Medusa

Answer 2

bell shaped and specialized for swimming.

Question 3

medusa and polyp are both

Answer 3

cnidarians

Question 4

the epidermis is the

Answer 4

outer layer of cnidarians

Question 5

the gastrodermis is the

Answer 5

inner layer of cnidarians

Question 6

the mesoglea is

Answer 6

a jelly like material between the epidermis and gastrodermis

Question 7

the planula is

Answer 7

a ciliated larva. found in some cnidarians

Question 8

cnidocytes are

Answer 8

specialized cells used for defense and capturing prey.

Question 9

a nematocyst has

Answer 9

a long filament coiled inside of it

Question 10

colloblast

Answer 10

secrete sticky substances to blind prey

Question 11

an apical organ enables a

Answer 11

ctenophore to snese its orientation in the water

Question 12

cnidarians and ctenophores are more complex than sponges because, unlike sponges, they have

Answer 12

tissues and organs

Question 13

the structure that coordinates the complex activities of a cnidarian’s body is the

Answer 13

nerve net

Question 14

an example of a cnidarian in the class hydrozoa is a

Answer 14

Portuguese man of war

Question 15

coral exist in a symbiotic relationship with

Answer 15

algae

Question 16

ctenophores move through the water by

Answer 16

beating their cilia

Question 17

how are nematocysts adapted for capturing prey

Answer 17

they have filaments with sharp tips that can inject poison

Question 18

list three differences between hydras and most other hydrozoans

Answer 18

hydras exist as polyps
they are not colonial
they live in fresh water

Question 19

what is the dominant body form in the life cycle of a scyphozoan

Answer 19

medusa

Question 20

what is the dominant body form in the life cycle of an anthozoan

Answer 20

polyp

Question 21

describe two examples of symbiosis found among cnidarians

Answer 21

clownfish to anemones

coral to algae

Question 22

how do coral polyps produce a coral reef

Answer 22

when polyps die, their hardened skeletons remain and build up over time

Question 23

would you expect to find green hydras in a cave pond that receives little or no light?

Answer 23

no, because it has a symbiotic relationship with algae. Algae needs sunlight for photosynthesis to occur