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Mollusks-Echinoderms
Mollusks, Worms,Arthropods,Echinoderms
| Question | Answer |
|---|---|
| mantle | layer of tissue that covers a mollusk's organs; secretes the shell or protects the body of mollusks without a shell |
| gill | organ where carbon dioxide from the mollusk is exchanged with oxygen from the water |
| open circulatory system | heart moves blood through vessels into open spaces around the organs (most mollusks) |
| radula | tonguelike organ with rows of teeth used by gastropods to obtain food (scrape and tear) |
| closed circulatory system | blood containing food and oxygen move through body through a series of closed vessels |
| setae | bristlelike structures on outside of earthworm used to hold onto soil and to move |
| crop | sac used for storage in the digestive system of an earthworm |
| gizzard | muscular structure that grinds the soil |
| polychaetes | marine worms |
| appendage | jointed structures of arthropods, such as legs, wings, or antennae |
| exoskeleton | hard outercovering that protects and supports arthropod bodies |
| molting | shedding and replacing the exoskeleton |
| spiracle | openings on the abdomen and thorax through which air enters and waste gases leave the insect's body |
| metamorphosis | process in which many insect species change their body forms to become adults |
| water vascular system | network of water-filled canals with thousands of tube feet connected to it |
| tube feet | hollow thin-walled tubes that each end in a suction cup |
| characteristics used to classify mollusks | kind of foot; presence of shell or not; if present what kind of shell |
| three most common groups of mollusks | gastropods, bivalves, and cephalopods |
| most specialized and complex mollusk | cephalopod |
| examples of bivalves | oyster, clam, scallop, and mussels two shells |
| examples of cephalopods | octopus, squid, cuttlefish and chambered nautilus |
| examples of gastropods | garden slugs,snails, and conch (one shell) |
| method of cephalopod movement | jet propulsion; Newton's 3rd law of motionnof action and reaction |
| value of mollusks | fod for other marine animals and humans; jewelry;shells provide information about the ecosystem |
| problems caused by mollusks | damage plants; damage boats and docks; can get sick from eating them |
| annelid | "little rings";segmented worms |
| sequence of earthworm digestion | mouth-crop-gizzard-intestines-anus |
| castings | earthworm waste |
| value of earthworm | aerate soil;speed up return of nutrients to the soil;developing drugs based on chemicals from leech saliva (prevent blood clots) |
| exchange of oxygen and carbon dioxide takes plave here | the moist skin |
| Arthropod groups | insects; arachnids; centipedes and millipedes;crustaceans; |
| incomplete metamorphosis | egg-nymph-adult |
| complete metamorphosis | egg-larvae-pupa-adult |
| grasshopper adaptation for obtaining food | mandible-chew through tough plants |
| butterfly adaptation for obtaining food | siphon-enable to drink nectar from flowers |
| mosquito adaptation for obtaining food | able to pierce skin and suck blood |
| Reasons for insect success | tough, flexible, waterproof exoskeleto; ability to fly; rapid reproductive cycle; small sizes; camouflage; |
| number of pair of legs an insect has | 3 |
| number of pair of legs an arachnid has | 4 |
| body regions of an insect | head-thorax-abdomen |
| body regions of an arachnid | cephalothorax-abdomen (cephalo-head) |
| value of arthropods | source of food; agriculture happening; |
| problems caused by arthropod | destroy crops,clothing, food, and property |
| Types of echinoderms | sea stars; brittle stars; sea urchins and sand dollars; sea cucumbers |
| characteristics of all echinoderms | spiny skin, endoskeleton;water-vascular system,tube feet,, radial symmetry |
| describe how echinoderms obtain food and move | through their tube feet |
| methods of defense | hard endoskeleton and spines; regenerate body parts rapidly; some have popison glands; and sea cucumbers can expel and regenerate their digestive system |
| value of echinoderms | control algae growth; eggs used as food by some people; researhed for possible medicines |
Created by:
klaud
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