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Ch. 24 Test Review

Biology: Introduction to Animals

Have no body cavity and include flatworms... Acoelomates
Have a fluid filled body cavity which is partially lined with mesoderm and includes roundworms... Pseudocoelomates
Have a fluid filled cavity which is complete lined with mesoderm and includes humans... Coelomates
Most animals reproduce... Sexually
Animal species which produce both sperm and egg... Hermaphrodites
Germ layer which gives rise to the digestive tract... Endoderm
Germ layer which gives rise to muscles... Mesoderm
Germ layer which gives rise to nervous tissue and skin... Ectoderm
Will not develop normally if a cell is removed, develop mouth from the first opening in the gastrula... Protostomes
Will develop normally if a cell is removed, develop the end of the digestive tract from the first opening in the gastrula... Deuterostomes
Sponges are ___; means of obtaining food... Filter-feeders
Capsules that hold coiled, threadlike tubes containing poison and barbs... Nematocysts
Fragmentation, budding and producing gemmules... Asexual reproduction
Polyps and medusa are two body forms of ... Cnidarians
ALL animals are ___ Eukaryotic heterotrophs
Phylum which classifies sponges... Porifera
Formed at the time of fertilization... Zygote
Consists of two layers of cells with one opening... Gastrula
Formed after the first mitotic division... Embryo
Developing animal when it is a fluid-filled ball of cells... Blastula
Under surface of an organism is called the ___ surface... Ventral
The back side, along the spine, of an organism is called the ___ surface... Dorsal
Cnidarians evolved directly from ___ Multicellular choanoflagellates
Imaginary line that divides a body form into two parts... Plane
Body plan with mirror image left and right portions... Bilateral symmetry
Hard outer covering that provides support to some animals... Exoskeleton
Attached to and stay in once place... Sessile
Body plan arranged around a central point.. Radial symmetry
Having no balance to the body plan... Asymmetry
Most animals are ___, do not have a backbone... Invertebrates
Diverse group of unicellular or multicellular eukaryotes that lack complex organ systems and live in moist environments... Protists
Body ___ allow animals to live in numerous habitats... Variations
Classifies new species based on evolutionary relationships... Systematist
Occurs when eggs and sperm combine outside the animal's body... External fertilization
As development of the gastrula continues, cells ___ or specialize into tissues... Differentiate
Evolutionary history of a species based on comparative relationships of structures and comparisons of modern life forms with fossils... Phylogeny
Tendency to concentrate nervous tissue and sensory organs at the anterior end of the animal... Cephalization
Head end... Anterior
Tail end... Posterior
"put together" in succession; similar parts... Segmentation
Sponges are the only animals without ___...` Tissues
To remain alive... Survive
Death of all members of a species or taxonomic group... Extinction
A substance taken from a 'Discodermia dissoluta' sponge which breaks down the nucleus in a cancer cell... Discodermolide
A cnidarian's mouth leads directly into it's ____... Gastrovascular cavity
Found in Cnidarians and conducts impulses to and from all parts of the body... Nerve net
Studies relationships between marine animals and their environments... Marine ecologist
Created by: SavannahElkins



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