Test Bank - Biological Science, 7th Edition
(Freeman, 2020) Chapter 30: Intro to Animals
Diploblasts - ANSWER: Animals whose embryos have two germ layers, the ectoderm
and endoderm.
Examples: Cnidarians (jellyfish, corals, sea anemones).
Triploblasts - ANSWER: Animals whose embryos have three germ layers: ectoderm,
endoderm, and mesoderm.
Examples: All animals except cnidarians and ctenophores.
Ectoderm - ANSWER: The outermost germ layer develops into the skin and the
nervous system.
Endoderm - ANSWER: The innermost germ layer that forms the digestive tract lining.
Mesoderm - ANSWER: The middle germ layer that forms muscles, circulatory
systems, and internal organs.
Cnidaria - ANSWER: A phylum of animals that includes jellyfish, corals, sea
anemones, and hydras, characterized by radial symmetry and two germ layers
(diploblastic).
Ctenophora - ANSWER: A phylum of marine animals known as comb jellies, which
are transparent and have radial symmetry and two germ layers (diploblastic).
Central Nervous System (CNS) - ANSWER: A system where neurons are
concentrated into tracts or ganglia, found in bilaterally symmetric organisms.
Radial Symmetry - ANSWER: Symmetry around a central axis; organisms with this
symmetry can be divided into multiple equal parts.
Bilateral Symmetry - ANSWER: Symmetry in which the body has one plane of
symmetry, typically with distinct left and right sides.
Cephalization - ANSWER: The concentration of sensory organs and nervous tissue in
the head region, often associated with bilateral symmetry.
Cerebral Ganglion - ANSWER: A cluster of nerve cells (often called a brain) that
processes information in bilaterally symmetric organisms.
Coelom - ANSWER: A fluid-filled body cavity lined with mesoderm, found in many
bilaterally symmetric animals.
Acoelomates - ANSWER: Animals that lack a coelom (body cavity).
#$%^&*(
(Freeman, 2020) Chapter 30: Intro to Animals
Diploblasts - ANSWER: Animals whose embryos have two germ layers, the ectoderm
and endoderm.
Examples: Cnidarians (jellyfish, corals, sea anemones).
Triploblasts - ANSWER: Animals whose embryos have three germ layers: ectoderm,
endoderm, and mesoderm.
Examples: All animals except cnidarians and ctenophores.
Ectoderm - ANSWER: The outermost germ layer develops into the skin and the
nervous system.
Endoderm - ANSWER: The innermost germ layer that forms the digestive tract lining.
Mesoderm - ANSWER: The middle germ layer that forms muscles, circulatory
systems, and internal organs.
Cnidaria - ANSWER: A phylum of animals that includes jellyfish, corals, sea
anemones, and hydras, characterized by radial symmetry and two germ layers
(diploblastic).
Ctenophora - ANSWER: A phylum of marine animals known as comb jellies, which
are transparent and have radial symmetry and two germ layers (diploblastic).
Central Nervous System (CNS) - ANSWER: A system where neurons are
concentrated into tracts or ganglia, found in bilaterally symmetric organisms.
Radial Symmetry - ANSWER: Symmetry around a central axis; organisms with this
symmetry can be divided into multiple equal parts.
Bilateral Symmetry - ANSWER: Symmetry in which the body has one plane of
symmetry, typically with distinct left and right sides.
Cephalization - ANSWER: The concentration of sensory organs and nervous tissue in
the head region, often associated with bilateral symmetry.
Cerebral Ganglion - ANSWER: A cluster of nerve cells (often called a brain) that
processes information in bilaterally symmetric organisms.
Coelom - ANSWER: A fluid-filled body cavity lined with mesoderm, found in many
bilaterally symmetric animals.
Acoelomates - ANSWER: Animals that lack a coelom (body cavity).
#$%^&*(
