Zoology Test 1d

Question 1

body plan of scyphozoa

Answer 1

• large
• horeshoe-shaped gonads
• oral arms
• no velum

Question 2

cubozoa

Answer 2

chironex or box jellyfish

Question 3

anthozoa

Answer 3

• coral reef (stony and soft)

- anemone

Question 4

body plan of anthozoa

Answer 4

• unlike other classes, body is densely muscular polyp
• gastrovascular cavity divided by numerous septa
• nematocysts
• no medusa stage, not polymorphic
• motile stage, larvae

Question 5

nematocysts

Answer 5

stinging threads

Question 6

what are the two kinds of corals

Answer 6

• true or stony corals

- soft corals

Question 7

stony corals

Answer 7

hexacorallians (6 tentacles)

Question 8

soft coral

Answer 8

octacorallians (8 tentacles)

Question 9

characteristics of stony coral

Answer 9

• polyp similar to miniature sea anemone
• secretes calcareous cup that, when in colonies, over the years develops into massive skeleton called coral rock
• gastrovascular cavities of different individuals connected

Question 10

characteristics of soft coral

Answer 10

• most are colonial
• colonies of polyps connected via gastrovascular tubes
• octomerous symmetry with 8 tentacles
• skeleton of protein and spicules

Question 11

generalizations about coral reefs

Answer 11

• among most productive of all ecosystems
• large formation sof calcium carbonate laid down by living organisms
• polyps and coralline algae are most responsible for precipitating calcium carbonate to form coral rock
• reef building corals require warmth, light and salinity of undiluted seawater
• zooxanthellae provide food via photosynthesis and enhance ability to secrete calcium carbonate

Question 12

coral bleeching

Answer 12

ejection of zooxanthellae, when they leave, the coral reef dies