Flatworms Roundworms Mollusks Segmented Worms Chapter 22 Flatworms Roundworms Mollusks Segmented Worms

Which is a true statement about a bilaterally symmetrical animal? (a) it has sense organs on the anterior end (b) it has sense organs on it’s posterior end (c) it does not display any type of movement (d) it is lacking a posterior

a

The excretory system of planarians is composed primarily of bulblike structures called (a) pharynxes (b) trematoda (c) bladders (d) flame cells

D. flame cells

One difference between nematodes and flatworms is that nematodes have a digestive system with (a) no posterior end (b) one opening (c) two openings (d) a mouth

C. two openings

The proglottids of a tapeworm has a complete (a) circulatory system (b) digestive system (c) reproductive system (d) respiratory system

C. reproductive system

Uncooked or poorly cooked pork may contain (a) pinworms (b) trichina worms (c) hookworms (d) free-living roundworms

B. Trichinia Worms

A ______ has a muscular tube called the pharynx, which can be extended outside the body to suck in food (a) ascaris (b) tapeworm (c) planaria (d) jellyfish

C. Planaria

Ascaris, hookworm, and trichina are all examples of (a) free-living roundworms (b) free-living flatworms (c) parasitic flatworms (d) parasitic roundworms

D. Parasitic Roundworm

This flatworm lives in the liver of sheep and can cause Schistosomiasis in humans (a) tapeworms (b) fluke (c) planaria (d) hookworm

B. Fluke

Phylum of flatworms (a) Platyhelminthes (b) Nematoda (c) Coelenterata (d) Rotifera

A. Platyhelminthes

Only worms in this section that have separate sexes (a) Roundworms (b) Tapeworms (c) Planaria (d) Flatworms

A. Roundworm

Which of the following is not a roundworm? (a) Ascaris (b) Hookworm (c) Planaria (d) Trichina

C. Planaria

This flatworm which belongs to the class Turbellaria has eyespots that detect light (a) hookworm (b) fluke (c) tapeworm (d) planaria

D. Planaria

Members of the phylum Annelida include earthworms, leeches, and (a) chitons (b) some mollusks (c) cephalopods (d) many segmented marine worms

D.

How do earthworms increase the nutrients available to plants? (a) by destroying harmful bacteria (b) by breaking down large pieces of organic matter (c) by organizing soil into larger clumps (d) leaving parts of their prey to decay in the soil

B.

In bivalves, particles of food are trapped by mucus that coats the (a) stomach (b) radula (c) pharynx (d) gills

D. gills

Earthworms have four small setae on each segment Earthworms have four small setae on each segment. How many parapodia do they have on each segment? (a) two (b) four (c) eight (d) zero

D. zero

The snail, clam, and squid all have a common feature. What is it? (a) flame cells (b) a foot (c) tentacles (d) stinging cells

B. a Foot

What food obtaining adaptation makes filter feeding unnecessary for a squid? (a) mantle cavity (b) beaklike jaws (c) foot (d) visceral mass

B. beaklike jaws

The hard shell like structure you removed from the squid was called the (a) mantle (b) armor (c) pen (d) pencil

C. Pen

Which of the following is not in the phylum Mollusca (a) snails (b) earthworms (c) squid (d) clams

B. Earthworms

Snails are adapted to live on land, but they need moisture to survive Snails are adapted to live on land, but they need moisture to survive. They are most active during (a) afternoon (b) dry periods (c) early morning (d) I don’t know, mark it wrong

C. Early Mornings

Univalves have a (a) single shell (b) double shell (c) bombshell (d) no shell

A. Single shell

Which organ of the earthworm functions to store food? (a) gizzard (b) crop (c) intestine (d) stomach

B. Crop

This class of Annelids has no bristles and is an external parasite (a) Oligochaeta (b) Polychaeta (c) Hirudinea (d) Cephalopoda

C. Hirudinea

A tapeworm has its reproductive organs in segments called

Proglottid

Organism that has both male and female parts

Hermaphrodite

Organism that has no coelom

acoelomate

The knob shaped head of a parasitic tapeworm

scolex

Concentration of receptors and nerves at the anterior end

ganglia

Obtain nourishment from living in another organism

parasite

Being able to cut into equal left and right halves

Bilateral symmetry

Organism that has a “false” body cavity

pseudocoelomate

Performs like a kidney in annelids

nephridia

Distinct swelling on earthworm involved in reproduction

clitellum

Tongue-like scraping structure in snails

radula

Thick membrane that secretes the shell in mollusks

mantle

Pairs of tubes that pump blood

Aortic arches

Sacs which store sperm

Seminal vesicles

Mollusks with two shells

bivalves

Final Question

Organs specialized for the exchange of gases in water

gills

What is the difference between free-living and parasitic organisms?

Free living gets all of its own resources on its own, parasites rely on a host to supply its resources

Describe the path by Ascaris through the human body Describe the path by Ascaris through the human body. Make sure you name all of the structures or organs it goes thru.

a. Eggs or larvae enter body in contaminated food or water. b. Hatch in small intestine and bore through the intestinal wall. c. Enter bloodstream and travel to the lungs. d. Travel up the air passages to the throat. e. Person coughs, swallows them, and they travel to the intestines. f. Develop into adults and reproduce.

Name three structural differences between flatworms and roundworms.

1. Flatworms are acoelomates so they have no body cavity and appear flat, roundworms have a coelomate and appear round. 2. Flatworms have one digestive opening, roundworms have two. 3. Flatworms move use cilia, roundworms move my muscle contractions 4. Round worms are covered with a cuticle, flatworms have cilia

Name two organs that the squid had that the earthworm did not Name two organs that the squid had that the earthworm did not. Why does the earthworm not have these structures?

Heart, Gonad and Stomach

What are the three body parts common to all mollusks?

Mantle Foot Visceral mass

Explain why the skin of a snail and an earthworm is moist

It breaths through its skin and it must remain moist for respiration to take place.

What features suggest that the squid is adapted to be a predator?

Beak and Tenticles