Unit 2

Question 0

Bilateral symmetry

Answer 0

Body can be split down center and produce mirrored left and right sides
Anterior head, posterior tail
Dorsal back, ventral belly
Seen in all vertebrates and Arthropoda

Question 1

Radial Symmetry

Answer 1

Resembles pie
No left or right sides
Oral surface is on top, aboral surface is on bottom
Seen in jellies

Question 2

What are the flagellated cells in sponges?

Answer 2

Choanocytes

Question 3

What is a nematode?

Answer 3

Non-segmented roundworms with a complete digestive tract, one layer of circular muscles, and pseudocoelomate

Question 4

What are the light sensitive eyespots in flatworms?

Answer 4

Ocelli

Question 5

What are the structures of earthworms that aid in copulation?

Answer 5

Two worms line up their sex organs:
Clitellum secretes mucus to hold mating worms together
Eggs laid in mucus; hardens to form cocoon

Question 6

What are the segments of a tapeworm called?

Answer 6

Proglottids (each has reproductive organs)

Question 7

Predators

Answer 7

Organisms that preys on other organisms for food

Question 8

Flagella

Answer 8

Move in all directions like a whip; typically one a few per organism

Question 9

Cilia

Answer 9

Move back and forth like windshield wipers; ciliates completely covered in cilia

Question 10

Complete digestive tract

Answer 10

Has both mouth and anus

Question 11

Incomplete digestive tract

Answer 11

One orifice for both food and waste

Question 12

Elephantiasis

Answer 12

Extreme swelling when worms block the lymph nodes

Question 13

Dorsal

Answer 13

Back

Question 14

Ventral

Answer 14

Belly

Question 15

Anterior

Answer 15

Head

Question 16

Posterior

Answer 16

Tail

Question 17

Autotroph

Answer 17

Organism that makes organic nutrients from inorganic raw materials

Question 18

Heterotroph

Answer 18

Organism that obtains both organic and inorganic raw materials from environment in order to live (most plants and animals that do not have photosynthesis)