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An animal without a backbone. Invertebrates make up 95% of animal species.
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An aquatic animal, such as a sponge, clam, or baleen whale, that feeds by sifting small organisms or food particles from the water.
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U1L08 Invertebrates
AP Biology
| Question | Answer |
|---|---|
| An animal without a backbone. Invertebrates make up 95% of animal species. | invertebrate |
| An aquatic animal, such as a sponge, clam, or baleen whale, that feeds by sifting small organisms or food particles from the water. | suspension feeder |
| A large opening in a sponge that connects the spongocoel to the environment. | osculum |
| A gelatinous region between the two layers of cells of a sponge. | mesohyl |
| An individual that functions as both male and female in sexual reproduction by producing both sperm and eggs. | hermaphrodite |
| The sessile variant of the cnidarian body plan. The alternate form is the medusa. | polyp |
| A specialized cell unique to the phylum Cnidaria; contains a capsule-like organelle housing a coiled thread that, when discharged, explodes outward and functions in prey capture or defense. | cnidocyte |
| An excretory system, such as the flame bulb system of flatworms, consisting of a network of tubules lacking internal openings. | protonephridium |
| A form of asexual reproduction in which females produce offspring from unfertilized eggs. | parthenogenesis |
| A hard encasement on the surface of an animal, such as the shell of a mollusc or the cuticle of an arthropod, that provides protection and points of attachment for muscles. | exoskeleton |
| In some lophotrochozoan animals, including brachiopods, a crown of ciliated tentacles that surround the mouth and function in feeding. | lophophore |
| One of the three main parts of a mollusc; the part containing most of the internal organs.See also foot, mantle. | visceral mass |
| A water-filled chamber that houses the gills, anus, and excretory pores of a mollusc. | mantle cavity |
| In gastropods, a developmental process in which the visceral mass rotates up to 180°, causing the animal's anus and mantle cavity to be positioned above its head. | torsion |
| A waxy covering on the surface of stems and leaves that prevents desiccation in terrestrial plants. | cuticle |
| A segmented ecdysozoan with a hard exoskeleton and jointed appendages. Familiar examples include insects, spiders, millipedes, and crabs. | arthropod |
| An arthropod that has chelicerae and a body divided into a cephalothorax and an abdomen. Living cheliceriforms include sea spiders, horseshoe crabs, scorpions, ticks, and spiders. | cheliceriform |
| An insect or closely related wingless, six-legged arthropod. | hexapod |
| One of a pair of clawlike feeding appendages characteristic of chelicerates. | chelicera |
| A member of a major arthropod group, the chelicerates. Arachnids include spiders, scorpions, ticks, and mites. | arachnid |
| One of a pair of jaw-like feeding appendages found in myriapods, hexapods, and crustaceans. | mandible |
| A member of one of the largest groups of crustaceans, which includes terrestrial, freshwater, and marine species. Among the terrestrial isopods are the pill bugs, or wood lice. | isopod |
| A slow-moving or sessile marine deuterostome with a water vascular system and, in larvae, bilateral symmetry. Echinoderms include sea stars, brittle stars, sea urchins, feather stars, and sea cucumbers. | echinoderm |
| A network of hydraulic canals unique to echinoderms that branches into extensions called tube feet, which function in locomotion and feeding. | water vascular system |
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