4.2 - Definition 1st

Question 1

Microscopic free floating marine organisms

Answer 1

Plankton

Question 2

Planktonic consumers that are either floating or weakly swimming animals

Answer 2

Zooplankton

Question 3

A marine invertebrate group with pentaradial symmetry and tube feet

Answer 3

Echinoderms

Question 4

A marine invertebrate group with a hard exoskeleton, ten jointed legs and a nauplius larval stage

Answer 4

Crustaceans

Question 5

Fish that have a bony skeleton and belong to the class Osteichthyes

Answer 5

Bony Fish

Question 6

Fish that have jaws and skeletons made only of cartilage and belong to class Chondrichthyes

Answer 6

Cartilaginous Fish

Question 7

Marine producers such as kelp and seaweeds

Answer 7

Macroalgae

Question 8

Aquatic flowering plants that are often found in estuarine and coastal environments

Answer 8

Marine Grasses

Question 9

An organism that plays a unique and crucial role in the way an ecosystem functions; without keystone species, the ecosystem would be dramatically different or cease to exist altogether

Answer 9

Keystone Species

Question 10

A planktonic stage of development which occur between the egg and juveniles; found in nearly all species of fish and invertebrates

Answer 10

Larvae

Question 11

Five arms (or fans) radiating from a central body cavity

Answer 11

Pentaradial Symmetry

Question 12

Tubular projections that assist in locomotion, feeding, and respiration

Answer 12

Tube Feet

Question 13

Distinctive larval stage of crustaceans

Answer 13

Nauplius

Question 14

The part of the exoskeleton that protects the dorsal side of the cephalothorax

Answer 14

Carapace

Question 15

The gaseous exchange surfaces of fish

Answer 15

Gills

Question 16

A thin body flap of skin covering and protecting the gills

Answer 16

Operculum

Question 17

A canal on the head and the side of the fish that contains sense organs; it is externally visible in bony fish but in cartilaginous fish it is under the skin

Answer 17

Lateral line

Question 18

Overlapping segments of bone covered by skin and mucus found on the outside of the fish

Answer 18

Scales

Question 19

Protrude from the body surface and assist in movement, stabilizing position, reproduction and protection

Answer 19

Fins

Question 20

A buoyancy organ found in bony fish

Answer 20

Swim Bladder

Question 21

A type of overlapping scales that provides protection and improved hydrodynamic efficiency in sharks

Answer 21

Denticles

Question 22

External openings from the gills through which water taken in at the mouth can pass back to the ocean

Answer 22

Gill Slits

Question 23

Strong, root-like structure that anchors the macroalgae to the seabed

Answer 23

Holdfast

Question 24

Long, tough, vertical stalk similar to the stem of plants

Answer 24

Stipe

Question 25

Leaf-like structures that 'hang' in the water and absorb light and minerals

Answer 25

Blades

Question 26

A gas-containing structure that provides buoyancy for some species of seaweed

Answer 26

Gas Bladder

Question 27

Structure at the base of plant that anchors it to the substrate and absorbs nutrients from the sediment

Answer 27

Root

Question 28

A horizontal underground structure that enables seagrasses to reproduce asexually

Answer 28

Rhizomes

Question 29

Photosynthetic organ of plants

Answer 29

Leaf

Question 30

Sexual reproductive organ of plants

Answer 30

Flower