Arthropods & Echinoderms

Question 1

3 Common Characteristics of Arthropods

Answer 1

Tough exoskeleton, jointed appendages, segmented body

Question 2

Chitin

Answer 2

Material that makes exoskeleton

Question 3

4 Purposes of Exoskeleton

Answer 3

1. Body support
2. Protection of soft body parts
3. Attachment point for muscles
4. Prevents water loss

Question 4

3 Segments of Arthropod

Answer 4

Head, Thorax (contains internal organs), abdomen (posterior part of the body)

Question 5

Cephalothorax

Answer 5

Arthropod with head and thorax fused together.

Question 6

3 Ways of Respiration in Arthropods

Answer 6

Gills, Book gills/Book Lungs, Tracheal Tubes.

Question 7

Spiracles

Answer 7

Air enters and leaves through here, leads to tracheal system

Question 8

Type of Circulation in Arthropods

Answer 8

Open Circulatory System

Question 9

Types of Mouthparts in Arthropods

Answer 9

Pincers, Fangs, Sickle-shaped jaws

Question 10

Malpighian Tubules

Answer 10

Organ to dispose of ammonia

Question 11

Nervous System of Arthropods

Answer 11

Well developed.

Question 12

Compound Eyes (How Do They Detect Stimuli?)

Answer 12

Detects color and motion, more than 2000 lenses

Question 13

Reproduction (Arthropods)

Answer 13

Internal
Male deposits sperm packet picked up by female
External: Eggs are released, males shed sperm around eggs.

Question 14

4 Subphyla of Arthropods

Answer 14

Trilobita (extinct), Chelicerata (Spiders, scorpions, mites, ticks), Crustarea (crabs, crayfish, lobsters), Uniramia (millipedes, centipedes, insects).

Question 15

Incomplete Metamorphosis Cycle

Answer 15

Egg to Nymph

Question 16

Complete Metamorphosis Cycle

Answer 16

Egg, Larva, Pupa, Adult

Question 17

Ecological Significance of Arthropods

Answer 17

Source of food
2/3 of flowering plants depend on arthropods for pollination

Question 18

Symbiotic Relationships of Arthropods

Answer 18

Bull horn Acacia tree/ants
Fish and Shrimp

Question 19

Economical Importance of Arthropods

Answer 19

Silkworm, honey, food, medicine (chitin used to dress wounds and make thread), agriculture

Question 20

Symmetry of Echinoderms

Answer 20

5 part radial symmetry

Question 21

Examples of Echinoderms (6)

Answer 21

Sea Stars
Brittle Stars
Sea Urchines
Sand Dollars
Sea Cucumbers
Sea Lilies

Question 22

Feeding (Echinoderms)

Answer 22

Carnivores, use tube feet to open shells and enzymes to digest prey.

Question 23

Respiration (Echinoderms)

Answer 23

Skin gills

Question 24

Nervous System (Echinoderms)

Answer 24

Nerve ring around mouth, radial nerves in arms. Clustered eyespots

Question 25

Reproduction (Echinoderms)

Answer 25

Gametes shed into open water. Some hermaphrodites