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7th Chap 2 Mollusk
Question | Answer |
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mollusk | An invertebrate with a soft, unsegmented body; most are protected by a hard outer shell. |
open circulatory system | A circulatory system in which the heart pumps blood into open spaces in the body and blood is not confined to blood vessels. |
gill | An organ that removes oxygen from water. |
gastropod | A mollusk with a single shell or no shell. |
herbivore | An animal that eats only plants. |
carnivore | An animal that eats only other animals. |
radula | A flexible ribbon of tiny teeth in mollusks. |
bivalve | A mollusk that has two shells held together by hinges and strong muscles. |
omnivore | An animal that eats both plants and animals. |
cephalopod | An ocean dwelling mollusk whose foot is adapted as tentacles that surround its mouth. |
Name 5 characteristics of all mollusks. | 1. invertebrate 2. Soft, unsegmented body 3. Often have a outer shell 4. Have a mantle 5. Have a foot |
What are the three types of mollusks? | 1. Gastropods 2. Bivalves 3. Cephalopods |
arthropod | An invertebrate that has an external skeleton, a segmented body, and joined appendages. |
exoskeleton | A waxy, waterproof outer shell or outer skeleton that protects the animal and helps prevent evaporation of water. |
molting | The process of shedding an outgrown exoskeleton. |
antenna | An appendage on the head of an animal that contains sense organs. |
crustacean | An arthropod that has two or three body sections, five or more pairs of legs, and two pairs of antennae. |
metamorphosis | A process in which an animal's body undergoes dramatic changes in form during its life cycle. |
arachnid | An arthropod with two body sections, four pairs of legs, and no antenna. |
abdomen | The hind section of an arthropods body that contains its reproductive organs and part of its digestive tract. |
What are the four major groups of arthropods? | 1. Arachnids 2. Centipedes/Millipedes 3. Crustaceans 4. Insects |
What are the 4 main characteristics that all arthropods have? | 1. invertebrates 2. External skeleton 3. Segmented body 4. Jointed appendages |
insect | An arthropod with three body sections, six legs, one pair of antennae, and usually one or two pairs of wings. |
thorax | An insect's midsection, to which its wings and legs are attached. |
complete metamorphosis | A type of metamorphosis characterized by four dramatically different stages. |
pupa | The third stage of complete metamorphosis, in which an insect changes from a larva to an adult. |
gradual metamorphosis | A type of metamorphosis in which an egg hatches into a nymph that resembles an adult, and has not distinct larval stage. |
nymph | A stage of gradual metamorphosis that usually resembles the adult insect. |