1
Biology 1108 Exam 3 Questions with Answers (100%
Correct Answers)
When two species compete for similar resources, resource partitioning
can alter the niche of the species that compete. The figure shows an
example of this.
Resource partitioning results in:
A. individuals of each species sharing the resources that they both
exploit.
B.individuals of each species hybridizing in the region of overlap.
C.a move from the fundamental niche to the realized niche for both
species.
D.a move from the realized niche to the fundamental niche for both
species. Answer: C.a move from the fundamental niche to the realized
niche for both species.
Cnidaria Answer: Phylum chartacterized by radial symmetry, 2 germ
tissues in the embryo; a closed internal gastric cavity, and well-
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developed tissues but not organs; includes jellyfish, esea anemones,
and corals
Bilateria Answer: Monophyletic group of animals with bilateral
symmetry
Protostomes Answer: Bilaterian in whcih the blastopore first opening to
internal cavity of developing embryo becomes mouth
Deuterostomes Answer: Bilaterian in which the blastopore, the first
opening to the internal cavity of the developing embryo, becomes the
anus
Humans and chordates
Choanocytes Answer: Type of cell that lines the interior surface of a
sponge;have flagella and function in nutrition and gas exchange
Mesohyl Answer: Gelatinous mass lies between interior and exterior cell
layers of sponge that contains some amoeba-like cells that function in
skeleton formation and dispersal of nutrients
Eumetazoa Answer: Monophyletic group of all animals other than
sponges
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Gastric Cavity Answer: Cindarians, closed internal site where
extracellular digestion and excretion take place
Epidermis Answer: Mammals, outer layer of skin, which serves as a
water-resistant, protective barrier.
Plants, outermost layer of cells in leaves, young stems (lacking
secondary growth), and roots. Outer layer of cnidarian body.
Endodermis Answer: In plants, layer of cells surrounding the xylem and
phloem at the center of the root that controls movement of nutrients
into xylem
Inner lining of cnidarian body
Mesoglea Answer: In cnidareans, gelatinous mass enclosed by
epidermis and endodermis
Placozoans Answer: Possibly simplest of all animals; each contains only
few thousand cells arranged into upper and lower epithelia that
sandwwich an interior fluid crisscrossed by network of multinucleate
fiber cells
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, 4
Annelid Worms Answer: Phylum of worms have a cylindrical body with
distinct segments and a bilaterian body plan
Mollusks Answer: Monophyletic group distinguished by a mantle which
plays a major role in movement skeleton-building, breathing, and
excretion; includes clams, snails, and squid
Gastropods Answer: Mollusks
-->Snails
-->Slugs
Cephaloppods Answer: Monophyletic group of mollusks
-->Squid
-->Cuttlefish
-->Octopus
-->Chambered nautilus
Distinctive adaptations-->well-developed eyes and muscular tentacles
that capture prey and sense the environment
© 2025 All rights reserved
Biology 1108 Exam 3 Questions with Answers (100%
Correct Answers)
When two species compete for similar resources, resource partitioning
can alter the niche of the species that compete. The figure shows an
example of this.
Resource partitioning results in:
A. individuals of each species sharing the resources that they both
exploit.
B.individuals of each species hybridizing in the region of overlap.
C.a move from the fundamental niche to the realized niche for both
species.
D.a move from the realized niche to the fundamental niche for both
species. Answer: C.a move from the fundamental niche to the realized
niche for both species.
Cnidaria Answer: Phylum chartacterized by radial symmetry, 2 germ
tissues in the embryo; a closed internal gastric cavity, and well-
© 2025 All rights reserved
,2
developed tissues but not organs; includes jellyfish, esea anemones,
and corals
Bilateria Answer: Monophyletic group of animals with bilateral
symmetry
Protostomes Answer: Bilaterian in whcih the blastopore first opening to
internal cavity of developing embryo becomes mouth
Deuterostomes Answer: Bilaterian in which the blastopore, the first
opening to the internal cavity of the developing embryo, becomes the
anus
Humans and chordates
Choanocytes Answer: Type of cell that lines the interior surface of a
sponge;have flagella and function in nutrition and gas exchange
Mesohyl Answer: Gelatinous mass lies between interior and exterior cell
layers of sponge that contains some amoeba-like cells that function in
skeleton formation and dispersal of nutrients
Eumetazoa Answer: Monophyletic group of all animals other than
sponges
© 2025 All rights reserved
,3
Gastric Cavity Answer: Cindarians, closed internal site where
extracellular digestion and excretion take place
Epidermis Answer: Mammals, outer layer of skin, which serves as a
water-resistant, protective barrier.
Plants, outermost layer of cells in leaves, young stems (lacking
secondary growth), and roots. Outer layer of cnidarian body.
Endodermis Answer: In plants, layer of cells surrounding the xylem and
phloem at the center of the root that controls movement of nutrients
into xylem
Inner lining of cnidarian body
Mesoglea Answer: In cnidareans, gelatinous mass enclosed by
epidermis and endodermis
Placozoans Answer: Possibly simplest of all animals; each contains only
few thousand cells arranged into upper and lower epithelia that
sandwwich an interior fluid crisscrossed by network of multinucleate
fiber cells
© 2025 All rights reserved
, 4
Annelid Worms Answer: Phylum of worms have a cylindrical body with
distinct segments and a bilaterian body plan
Mollusks Answer: Monophyletic group distinguished by a mantle which
plays a major role in movement skeleton-building, breathing, and
excretion; includes clams, snails, and squid
Gastropods Answer: Mollusks
-->Snails
-->Slugs
Cephaloppods Answer: Monophyletic group of mollusks
-->Squid
-->Cuttlefish
-->Octopus
-->Chambered nautilus
Distinctive adaptations-->well-developed eyes and muscular tentacles
that capture prey and sense the environment
© 2025 All rights reserved
