Science 7 - Earthworms Practical Exam

Front 1

What kind of symmetry does an earthworm have?

Back 1

Bilateral Symmetry

Front 2

Worms were the first to....

Back 2

evolve with distinct head and tail regions.

Front 3

What phylum are earthowrms in?

Back 3

Phylum Annelida

Front 4

What role do worms play in the environment?

Back 4

- airates soil
- fertilizes soil
- makes a better environment for plants to grow

Front 5

Circulatory System

Back 5

contains:
- hearts (5)
- ventral vessel
- dorsal vessel
through which all bodily fluids move

Front 6

Respiratory System

Back 6

-simple O2 -> CO2 exchange occurs through the skin
-worm must be moist for this to occur

Front 7

Simple Nervous System

Back 7

- brain (small)
- 2 nerves
- nerve cord

Front 8

Digestive System

Back 8

mouth->pharynx->esophagus-> crop->gizzard->intestine->anus

Front 9

Reproductive System

Back 9

- hermaphrodites(male&female)
- cross fertilization
- organs under clitellum

Front 10

Dorsal

Back 10

Top side of an organism

Front 11

Ventral

Back 11

Bottom side of an organism

Front 12

Anterior

Back 12

Front side of an organism
(Near mouth)

Front 13

Posterior

Back 13

Back side of an organism
(Near anus)

Front 14

Segments

Back 14

- ringlike segments make up an earthworm's body
- 100+

Front 15

Prostomium

Back 15

- on anterior side
- small lobe
- used for burrowing

Front 16

Setae

Back 16

- help the worm move through the ground
- on the ventral side
- four pairs on each segment

Front 17

Mouth

Back 17

- used to eat things
- part of the digestive system

Front 18

Pharynx

Back 18

- muscular
- helps to ingest food
- part of digestive system

Front 19

Esophagus

Back 19

- leads from the pharynx to the crop
- part of digestive system

Front 20

Crop

Back 20

- an enlarged storage sac
- part of digestive system

Front 21

Gizzard

Back 21

- food is grinded here by swallowed stones & heavy muscular contractions
- part of digestive system

Front 22

Intestine

Back 22

- leads from gizzard to anus
- responsible for most of the digestion & absorption of food
- part of digestive system

Front 23

Anus

Back 23

- located on posterior side
- lets out wastes
- part of digestive system

Front 24

Hearts

Back 24

- pump blood through the two major blood vessels
- 5 hearts
- part of circulatory system

Front 25

Ventral Vessel

Back 25

- one of major blood vessels
- moves blood anteriorly
- part of circulatory system

Front 26

Dorsal Vessel

Back 26

- one of major blood vessels
- moves blood posteriorly
- part of circulatory system

Front 27

Brain

Back 27

- small
- part of the nervous system

Front 28

Ventral Nerve Cord

Back 28

- extends through the length of the worm
- part of nervous system

Front 29

Seminal Vesicles

Back 29

- 3 large, white structures
- contain testes
- make sperm
- part of reproductive system

Front 30

Seminal Receptacles

Back 30

- receive & store sperm from mate
- part of reproductive system

Front 31

Ovaries

Back 31

- contain eggs
- part of reproductive system

Front 32

Male and Female Pores

Back 32

male pore
- releases sperm
female pore
- releases eggs

Front 33

Clitellum

Back 33

- part of reproductive system

Front 34

Nephridia

Back 34

- small coiled tubules
- one on each side of ventral nerve cord
- collect waste from coelom & blood vessels and expel it outside through small pores
- part of excretory system