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Worms and Mollusks
| Question | Answer |
|---|---|
| What are the simplest animals to have three embryonic germ layers? | Flatworms |
| What does a flatworm's eyespots detect? | changes in amount of light in the environment |
| Undigested material leaves a roundworm's body through the? | anus |
| What are soft-bodied animals that usually have an internal or external shell? | mollusks |
| What kind of shell do mollusks have? | internal or external |
| What is a bivalve? | an animal where two shells are held together by powerful muscles |
| How do bivalves hold together their shells? | with powerful muscles |
| How many shells do bivalves have? | 2 |
| What are examples of bivalves? | clams and oysters |
| Food enters a flatworm's body cavity through a muscular tube called a ___. | pharynx |
| What is a ganglia? | cluster of nerve cells that control the nervous system in flatowrms |
| What are Turbellarians? | free-living flatworms |
| Most free-living flatworms are _____. | carnivores |
| Why do parasitic flat worms NOT need a complex digestive system? | what they eat is already digested |
| What is a scolex | a structure used to attach to the intestinal wall of a host |
| Who has a scolex? | a tapeworm |
| Where are the male and female reproductive organs found in a tapeworm? | a proglottid |
| Roundworms have a _____ digestive tract. | complex |
| Describe the digestive tract of a roundworm. | A tube within a tube |
| How many openings does a round worm's digestive system have? | 2 |
| What are the two openings found in a roundworm's digestive tract? | mouth and anus |
| What do roundworms use to move? | muscles |
| What is a hydrostatic skeleton? | used for movement and support in a roundworm |
| What is the similarity between the body systems of parasitic roundworms and free-living roundworms? | They carry out the same basic functions |
| The nervous system of roundworms include ______. | ganglia |
| What are ganglia? | clusters of nerve cells |
| How do you become infected with roundworms? | drinking unfiltered water, eating undercooked and raw food and from biting insects |
| What causes elephantiasis? | filarial worm |
| How do you get trichinosis? | eating undercooked meat with larval cysts of the Trichinella |
| What does the gizzard do? | grinds food into small pieces in earthworms |
| The body of an annelid has _____ | segments |
| What do you find along the body of an annelid? | septa |
| What is nephridia? | structures in annelids that eliminate nitrogen-containing wastes |
| What structure in an earthworm acts as a heart? | dorsal blood vessel |
| Why is the dorsal blood vessel in an earthworm like a heart? | it contracts rhythmically and pumps blood |
| If an earthworm cannot produce offspring, what might be malfunctioning? | the clitellium |
| What is an example of a worm that is an external parasite? | the leech |
| What is a proboscis? | a muscular extension that is used to penetrate the tissue of a host |
| What is an example of a worm that has a proboscis? | a leech |
| What are setae? | bristle-like structures on annelids bodies |
| How are earthworms beneficial to farmers? | the tunnels they dig provide passageways for plants, roots and water |
| What three things use the passageways that the earthworms dig? | plants, roots and water |
| Why are larvae of marine animals important? | they are eaten by fish and other marine animals |
| What kind of water conditions are found in an area where large numbers of mud-dwelling, filter-feeding marine annelids found? | poor and dirty |
| What would you find in poor and dirty marine water conditions? | mud-dwelling, filter feeding marine annelids |
| What is the mantle? | a thin layer of tissue that cover's a mollusk's body |
| What covers a mollusk's body? | the mantle |
| What is a siphon? | a tube-like structure through which water enters and leaves a mollusk's body |
| What does water enter and leave a mollusk's body through? | a siphon |
| Why does a squid need a closed circulatory system? | it needs to transport blood quicker through its body |
| What are the feeding types in the phylum Mollusca? | herbivores, carnivores, and omnivores |
| Why do we use filter-feeding bi-valves to monitor the environmental health habitat? | the bivalves will concentrate pollutants and microorganisms in their tissues |
| What are the classes of mollusks? | gastropoda, cephalopoda, bivalves |
| What are examples of cephalopods? | octopus, squid, cuttle fish, nautilus |
| What are examples of gastropods? | land slugs, pond snails and sea butterflies |
| What are examples of bivalves? | clams, oysters, scallops, mussels |
| What is a specific characteristic that will distinguish a nautilus from another type of mollusk? | tentacles, ability to move the tentacles and more tentacles than other cephalopods (nautilus has 90) |
| The most active mollusk? | cephalopoda |
| What is a pond snail an example of? | gastropod |
| How is the foot modified in different groups of mollusks? | one is a spade-shaped burrowing structure and the other is tentacles |
| The spade shaped burrowing structure and tentacles are modifications of the _____ | foot |
Created by:
sleeom