A rigid external covering for the body in some invertebrate animals, esp. arthropods, providing both support and protection

An internal skeleton, such as the bony or cartilaginous skeleton of vertebrates

An animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes

A person or animal having both male and female sex organs or other sexual characteristics, either abnormally or (in the case of some organisms) as the natural condition

A diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum

Internal Fertilization

occurs when the sperm and egg combine inside the animal's body.

External Fertilization

occurs when egg and sperm combine outside the animal's body.

looks like a double bubble, one bubble inside another. it is a two-cell-layer sac with an opening at one end.

develop into the digestive organs and the lining of the digestive tract.

the outer layer of cells in the gastrula.

cell division in some animals continues in the gastrula until another layer of cells.

describes the similarity or balance among body structures of organisms.

can be divided along any plane, through the central axis, into roughly equal halves.

can be divided into mirror image halves only among one plane through the central axis.

of or near the head end or toward the front plane of a body

the tendency to concentrate nervous tissue and sensory organs at the anterior end of the animal.

the backside, animals with bilateral symmetry have this.

the underside belly, animals with bilateral symmetry have this.

one type of fluid-filled cavity.

a fluid-filled body cavity that develops between the mesoderm and the endoderm rather than developing entirely within the mesoderm as in coelomates.

animals that do not have a coelom such as flatworms.

the mouth develops from the first opening in the gastrula.

the anus develops from the first opening in the gastrula.

when an organism such as a sponge gets its food by filtering small particles from water.

they are attached to and stay in one place.

Cnidarian tentacles are armed with stinging cell.

Gastrovascular Cavity

the inner cell layer of cnidarians surrounds a space.

conducts impulses to and from all parts of the body.

a tube-shaped body and a mouth surrounded by tentacles.

an umbrella-shaped body and tentacles that hang down.

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Biology Chapter 24

Chapter 24 Vocabulary

Question	Answer
Invertebrate	Animal without backbones.
Exoskeleton	A rigid external covering for the body in some invertebrate animals, esp. arthropods, providing both support and protection
Endoskeleton	An internal skeleton, such as the bony or cartilaginous skeleton of vertebrates
Vertebrate	An animal of a large group distinguished by the possession of a backbone or spinal column, including mammals, birds, reptiles, amphibians, and fishes
Hermaphrodite	A person or animal having both male and female sex organs or other sexual characteristics, either abnormally or (in the case of some organisms) as the natural condition
Zygote	A diploid cell resulting from the fusion of two haploid gametes; a fertilized ovum
Internal Fertilization	occurs when the sperm and egg combine inside the animal's body.
External Fertilization	occurs when egg and sperm combine outside the animal's body.
Blasternal	a fluid-filled ball of cells.
Gastrula	looks like a double bubble, one bubble inside another. it is a two-cell-layer sac with an opening at one end.
Endoderm	develop into the digestive organs and the lining of the digestive tract.
Ectoderm	the outer layer of cells in the gastrula.
Mesoderm	cell division in some animals continues in the gastrula until another layer of cells.
Symmetry	describes the similarity or balance among body structures of organisms.
Radial Symmetry	can be divided along any plane, through the central axis, into roughly equal halves.
Bilateral Symmetry	can be divided into mirror image halves only among one plane through the central axis.
Anterior	of or near the head end or toward the front plane of a body
Posterior	tail end.
Cephalization	the tendency to concentrate nervous tissue and sensory organs at the anterior end of the animal.
Dorsal	the backside, animals with bilateral symmetry have this.
Ventral	the underside belly, animals with bilateral symmetry have this.
Coelom	one type of fluid-filled cavity.
Pseudocoelom	a fluid-filled body cavity that develops between the mesoderm and the endoderm rather than developing entirely within the mesoderm as in coelomates.
Acoelomate	animals that do not have a coelom such as flatworms.
Protostome	the mouth develops from the first opening in the gastrula.
Deuterostome	the anus develops from the first opening in the gastrula.
Filter Feeder	when an organism such as a sponge gets its food by filtering small particles from water.
Sessile	they are attached to and stay in one place.
Cnidocytes	Cnidarian tentacles are armed with stinging cell.
Gastrovascular Cavity	the inner cell layer of cnidarians surrounds a space.
Nerve Net	conducts impulses to and from all parts of the body.
Polyp	a tube-shaped body and a mouth surrounded by tentacles.
Medusa	an umbrella-shaped body and tentacles that hang down.

Created by: StephanyCastillo

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